VGA-RCA adapter cable: description and purpose. Homemade vga adapter tulip. VGA-RCA adapter cable: description and purpose Vga pinout for tulips

The name HDMI (High Definition Multimedia Interface) literally translates as High Definition Multimedia Interface. A standard HDMI cable has 19 wires. Knowing the pinout diagram of the cable, you can connect an HDMI outlet to it or fix a broken wire, replace a damaged connector. The individual contacts of the socket are numbered from right to left, with odd-numbered contacts in the top row, and even-numbered ones in the bottom row.

HDMI is used as an interface for transmitting high quality uncompressed digital video and audio signals. The HDMI interface supports the transmission of video and audio signals such as DTS, LPCM, DVD-Audio, Dolby Digital, Super Audio CD, etc. at maximum resolution. HDMI can have a maximum data transfer rate of up to 10.2 Gbps (340 MHz). The interface uses the TMDS protocol.

HDMI connectors (mini, micro) and their pinout

Type "A" - 19 pins, specification 1.0
Type "B" - 29 contacts, specification 1.0
Type "C" - 19 pins (mini), specification 1.3
Type "D" - 19 pins (micro), specification 1.4
Type "E" - 19 pins, specification 1.4

HDMI Type A (19pin) pinout

HDMI Type B (29pin) pinout

HDMI Type C mini (19pin) pinout

HDMI Type D micro (19pin) pinout

Contact				Descriptionsignal
HDMI Type A (standard)	HDMI Type B	HDMI Type C (mini)	HDMI Type D (micro)	Descriptionsignal
1	1	2	3	TMDS Data2 + (Video signal, pair 2)
2	2	1	4	TMDS Data2 Shield
3	3	3	5	TMDS Data2- (Video signal, pair 2)
4	4	5	6	TMDS Data1 + (Video signal, pair 1)
5	5	4	7	TMDS Data1 Shield
6	6	6	8	TMDS Data1- (Video signal, pair 1)
7	7	8	9	TMDS Data0 + (Video signal, pair 0)
8	8	7	10	TMDS Data0 Shield
9	9	9	11	TMDS Data0- (Video signal, pair 0)
10	10	11	12	TMDS Clock +
11	11	10	13	TMDS Clock Shield
12	12	12	14	TMDS Clock- (Video clock frequency)
—	13	—	—	TMDS Data5 + (Video signal, pair 5)
—	14	—	—	TMDS Data5 Shield
—	15	—	—	TMDS Data5- (Video signal, pair 5)
—	16	—	—	TMDS Data4 + (Video signal, pair 4)
—	17	—	—	TMDS Data4 Shield
—	18	—	—	TMDS Data4- (Video signal, pair 4)
—	19	—	—	TMDS Data3 + (Video signal, pair 3)
—	20	—	—	TMDS Data3 Shield
—	21	—	—	TMDS Data3- (Video signal, pair 3)
13	22	14	15	CEC (Signal)
14	23	17	2	Reserved (HDMI 1.0-1.3c) HEC Data- (HDMI 1.4+ with Eternet)
—	24	—	—	Reserved (Reserved in the cable, but not connected)
15	25	15	17	SCL (I2C Serial Clock for DDC)
16	26	16	18	SDA (I2C Serial Data for DDC)
17	27	13	16	DDC / CEC / HEC Ground
18	28	18	19	+ 5V Power (max 50 mA)
19	29	19	1	Hot Plug Detect (All versions) HEC Data + (HDMI 1.4+ with Ethernet)

HDMI cable pinout by color

HDMI cable is divided into 5 groups of 3 cores. And 4 more veins go separately. The connector provides switching of four groups of shielded balanced circuits for transmitting digital video signals (aluminum foil shield), separate wires for service data and power.

Contact number	Appointment	Wire color	Note
1	Video signal 2+	White	Red group
2	Video signal 2 screen	Screen
3	Video signal 2-	Red
4	Video signal 1+	White	Green group
5	Video signal 1 screen	Screen
6	Video signal 1-	Green
7	Video signal 0+	White	Blue group
8	Video signal 0 screen	Screen
9	Video signal 0-	Blue
10	Tact +	White
11	Clock screen	Screen
12	Tact -	Brown
13	Service signal CEC	White
14	Utility	White	Yellow group
15	Asymmetrical bus SCL signal	Orange
16	SDA signal asymmetric bus	Yellow
17	Earth	Screen	Yellow group
18	+5 V power supply	Red
19	Connection detector	Yellow	Yellow group

There is no single color marking of conductors and each cable manufacturer may have its own marking. This is exactly what was used in the test sample of the HDMI cable.

HDMI cable pinout for sound

Sound in modern TVs or set-top boxes sometimes only comes out through HDMI (without the usual audio outputs or like headphones, that is, there is no old audio output). Therefore, one has to think about how to "extract" the sound signal from the herchdimia nest. To do this, you can buy a special audio adapter on Ali (600 rubles) in the form of a small box that extracts sound from the signal going through HDMI and outputs it in analog form to two RCA tulip connectors or in digital to optical SPDIF.

HDMI-DVI pinout

Pinout of HDMI connector for RCA tulip

Usually, an HDMI-RCA adapter is used when it is necessary to reproduce or transmit data in video and audio format. This interconnect cable has a built-in chip that converts HDMI digital signals to composite video or audio. This signal is then fed through the cinch connector to the TV screen.

To convert a purely digital HDMI signal to analog (S-Video, component or composite), you need not just an adapter, but a whole device consisting of a digital signal receiver, several DACs, a TV signal shaper, and a bunch of small details. Too hard to call it just an adapter.

The adapter is designed as a miniature hardware module with a wire. On one end, which has an HDMI connector, and on the other, three multi-colored tulip connectors.

HDMI-VGA adapter pinout

An HDMI-VGA adapter consists of more than just wires and connectors. An HDMI-VGA cable is a whole circuit on a microcircuit, which is very difficult to solder yourself - just buy a ready-made adapter (as is the case with sound extraction from such a cable). Its price on Ali is about 700 rubles.

HDMI-HDMImini adapter

DIY HDMI cable making

Making an HDMI cable at home is not a problem - just use a piece of wire of the correct length and the necessary connectors. Strip a couple of centimeters from the braid, strip the insulation from the wires and carefully tin.

Depending on which connectors you need to use at the ends of the cable, we select the pinout scheme and solder it. For example, if you need to have hdmi plugs on both sides, the scheme will be as follows:

Here is the option for both standard size and mini or micro hdmi.

You will need

Internet very old TV-out over d-sub video card, d-sub m connector, rca connector, 75 ohm coaxial cable, soldering supplies

Instructions

On the internet you will find a ready-made tulip vga connector, but unfortunately, even if you buy it, it will not work. To transmit a composite signal from a computer, it is necessary to support this type of signal standard. Until 2000, they produced video cards with support for tv-out over d-sub. That is, indeed, to such a video card, you could have a vga tulip TV adapter. However, after 2000, the signal transmission standard was changed, and video cards stopped transmitting the composite signal. Thus, if you make a vga tulip adapter or buy a ready-made one and try to use it on a modern video card, the adapter will not work under any circumstances.

If you still need to output the signal from the vga output of a modern video card through the composite input to the TV (yellow tulip video), then the only way to do this is to purchase a special converter device. It performs signal transcoding between different standards. The cost of this converter varies from $ 10 to $ 20. This is a rather complex device, so only a professional can assemble it on their own.

If you are the lucky owner of an ancient video card (released before 2000) that supports tv-out over d-sub, for example, from Matrox, you can try to make a vga tulip adapter yourself. To do this, you need a wiring diagram for rca and d-sub connectors or a "pinout".

Prepare vga connectors and cinch for soldering. Open the protective case, apply flux to the desired pads according to the pinout. Take a piece of cable of the required length, strip the ends, tin them.

Be sure to slide the connector housings onto the cable before soldering it to the connectors. Solder the inner core of the cable to the center pad of the cinch connector and pin number 3 of the vga connector. Solder the shield conductor of the cable (braid) to the other pin of the cinch connector and to pin number 8 of the vga connector on the other side of the cable.

Assemble the connectors on both ends of the cable. The adapter is ready. You can try connecting your TV to your computer.

Instructions

1. On the internet you will find a more readily available tulip vga connector, but unfortunately, even if you get one, it won't work. To transfer a composite signal from a computer to a TV, it is necessary for the video card to support this type of signal standard. Until 2000, they produced video cards using tv-out over d-sub. That is, you could truly connect a TV to such a video card through a vga tulip adapter. However, later in 2000, the standard for signal transmission was changed, and video cards stopped transmitting the composite signal. Thus, if you make a vga tulip adapter or purchase a ready-made one and try to use it on a current video card, then the adapter will not work under any circumstances.

2. If you still need to output the signal from the vga output of the current video card through the composite input to the TV (yellow tulip video), then the exclusive method to do this is to buy a special converter device. It performs signal transcoding between different standards. The cost of this converter varies from $ 10 to $ 20. This is a rather difficult device, therefore, only a specialist can assemble it independently.

3. If you are the joyful owner of an old video card (pre-2000 release) that supports tv-out over d-sub, say by Matrox, you can try making a tulip vga adapter yourself. To do this, you need a wiring diagram for the rca and d-sub connectors, or "pinout".

4. Prepare vga connectors and cinch for soldering. Open the defensive housing, apply flux to the required pads according to the pinout. Take a piece of cable of the required length, strip the ends, tin them.

5. Slide the connector housings securely onto the cable before soldering to the connectors. Solder the inner core of the cable to the center pad of the cinch connector and pin number 3 of the vga connector. Solder the shield conductor of the cable (braid) to the other pin of the cinch connector and to pin 8 of the vga connector on the other side of the cable.

6. Assemble the connectors on both ends of the cable. The adapter is ready. You can try connecting your TV to your computer.

Related Videos

Note!
Pay special attention to setting the signal format, resolution, and decoding. Start with the lowest values. The TV may not recognize the video signal for most combinations of these settings, so try different options.

Helpful advice
The most primitive method of connecting a TV to a computer is a video card with a separate tv-out, tulip or s-video. You can also use a converter. Another method of connecting a computer to a TV is acceptable for you, for example: - connecting with a vga vga cable, if on a TV there is a vga input. Some modern TV models are equipped with a special adapter for connecting vga; - connection via a vga s-video adapter. This connection is permissible on some models of ATI Radeon video cards, for example, the 3000 series and a special setting of the video card driver. Also, the TV must have an s-video input; - connection via a vga YPbPr adapter. The same as in the previous paragraph, but the TV must have a YPbPr component input (three tulips are not yellow); - connection via a vga SCART adapter. The same as in the previous paragraph, but the TV must have a SCART input (comb).

The master's answer:

Today, many are interested in the question of self-creation of the vga tulip adapter. The idea of connecting a TV to a computer came to the liking of many owners of such equipment. Moreover, it was on this interest that a large number of speculations arose.

To connect a TV to a computer, you need the Internet, an old model of a video card with TV-out over d-sub support, a 75 Ohm coaxial cable, an rca connector, a d-sub m connector and a set of soldering accessories.

Of course, on the Internet you can find a ready-made vga tulip connector, but it will not work at all. In order for a composite signal to come from a computer to a TV, the video card must support the specified type of signal standard. Those video cards that manufacturers produced before 2000 were characterized by support for tv-out over d-sub. With such a video card, it was possible to connect a TV using the vga tulip adapter. However, after 2000, there were changes in the signal transmission standards, and the video card stopped transmitting the composite signal. In other words, if you make a vga tulip adapter yourself or buy a ready-made one, when you use it on a modern video card, it will absolutely not work.

If you want to output the signal from the vga output of a modern video card model through the composite input to the TV (usually it is marked in yellow), you need to take care of purchasing a special converter device. Thanks to this device, the signal is re-encoded between different standards. This converter costs between US $ 10-20. Such a device is characterized by a complex configuration, so only a professional can assemble it independently.

In case you have an old model of a video card (released before 2000), which is capable of supporting tv-out over d-sub (this was produced by Matrox), you can try to make an adapter yourself. In this case, you will have to use the connection diagram of the d-sub and rca connectors or the "pinout".

The tulip and vga connectors must be prepared for soldering. To do this, remove the protective case, apply flux to the required contact pads, while following the pinout instructions. After that, at a piece of cable of the required length, you need to strip the ends and tin them.

Slide the connector housings over the cable before soldering to the connectors. The inner core of the cable must be soldered to the center pad of the tulip connector, and the other end to pin # 3 of the vga connector. Then the braid, or shielding conductor of the cable, is soldered to the other pin of the tulip connector, and on the other side to pin # 8 of the vga connector.

Then they assemble the connectors at both ends of the cable, after which your adapter is quite suitable for use. Now through testing the connection of the TV to your home computer.

note

Particular attention should be paid to setting the resolution, signal format and decay. Always start with the lowest values. Since the TV may not detect a video signal in most combinations of settings, you should try different options.

Useful Tips

The easiest way to connect a TV to a computer is a video card with a separate TV-out, tulip or s-video.

You can also use a converter.

Sources:

adapter from vga to tulip buy

The VGA-RCA adapter cable is used to connect audio and video devices. So, for example, using it, you can connect a DVD-player, satellite tuner, which has an analog component video output, to a multimedia projector with a component video input. Quite often, consumer equipment users are faced with a choice: buy a VGA-RCA adapter (or an extension cable) or make it yourself. This is due to the fact that the cost of long original cables from leading manufacturers is quite high. And the monetary and labor costs for making such a device with your own hands are very small. In this article, we will look at what a VGA-RCA adapter is, as well as its pinout. With this information, you will be able to make the mentioned cable yourself.

Description and pinout

For the manufacture of the subject of our conversation, it is recommended to use (as a conductor) a computer cable of the "twisted pair" type CAT5 (it is better to use a shielded cable), since it is capable of transmitting a video signal without loss of quality over a distance of up to 50 meters. The VGA-RCA adapter contains three RCA connectors (male or female, depending on the purpose) and a D-Sub connector (15-pin).

Pinout of the D-Sub connector for this adapter:

the first is signal red;
the second is signal green;
the third is signal blue;
the sixth is the land of red;
the seventh is the land of green;
the eighth is the land of blue;
4, 5, 9, 10, 11, 12, 13, 14, 15 pins are not used.

Thus, only six pins are required for the VGA-3 RCA adapter. If you are using a twisted pair cable, then use colored wire pairs to solder each tulip. For greater rigidity, the ends on which the RCA connectors are soldered are recommended to be crimped with a heat shrink sleeve. Here, in fact, is the whole description. The resulting RCA-VGA adapter supplies the component video signal to the VGA-input.

Application

Very often, a VGA-RCA adapter is used to supply a component video signal to a computer monitor. However, this cannot be done, the adapter will not work. This is because the computer monitor does not accept the color-difference component signals from the DVD player, but the RGB component. To ensure the operability of such a connection, the use of a special transcoder is required.

Conclusion

The described method of making an adapter can also be used for other similar products: 3 x RCA - 3 x RCA, VGA to VGA extenders, etc. For example, you can make an adapter for an S-Video or Scart cable, the most important thing is to use the correct pinout these connectors. The use of twisted pair cables makes such adapters and extension cords very cheap to manufacture. If you need a short adapter, you can use an unshielded cable to further reduce your costs. And if you need an extension cord of 10 meters or more, then it is better to take a twisted pair with a copper screen. This will ensure the high quality of the transmitted component video signal. It is better not to save on this element, because no one will like watching a movie, while “snow” or stripes will appear on the screen, distorting the picture. It is better to do it once well than to redo and fix flaws.

Those who own a significant amount of audio and video equipment are faced with a choice: do it yourself or purchase an adapter in a store that will convert signals of different types. Needless to say, but factory devices cost quite a lot, but you can often do without them. And within the framework of the article, it will be discussed how to make a VGA RCA adapter. Frequently asked questions will also be answered.

What is a VGA RCA adapter

The circuit of this device may seem complicated, but only until you understand it. What is this device? This is an adapter from tulips (RCA connectors) of analog video output to VGA D-Sub to 15 pins. The device described here can be used to connect a DVD player or satellite tuner to a multimedia projector. Of course, provided that there is no possibility of working directly through the same type of cable, which is usually common in cheap or outdated devices.

What is the idea?

How to implement such an idea? You need a computer cable (type - twisted pair CAT5 / CAT5e classification) designed to carry the video signal. We will use it due to the fact that the transmission is carried out over a distance of fifty meters without loss of quality.

First, we need to acquire three RCA connectors and one D-Sub15 pin (this is a plug), as well as a twisted pair. The last detail is better to take shielded STP than UTP. But this is more difficult to get, which affects the price. Therefore, the question of possibilities and desires is considered here. There is not much difference between the elements, but there is one caveat: it is better to use UTP if the cable length is less than 10 meters. If the distance is greater, then it will still be better to find STP.

Pinout

How to pinout a 15 pin D-Sub connector? The numbers go from left to right:

1 - R-Y (Pr).
2 - Y.
3 - B-Y (Pb).
4 - Ground - Brown.
5 - Ground - WhtBrown.
6 - Ground R-Y (Pr) - WhtRed.
7 - Ground Y - WhtGreen.
8 - Ground B-Y (Pb) - WhtBlue.
9 - Not needed.
10 - Ground.
11 - Not needed.
12 - DDC DAT.
13 - Horizontal Synchronization.
14 - Vertical Synchronization.
15 - DDC Clock.

For the VGA RCA adapter cable, we need six pins out of the fifteen presented. How to properly unsolder connectors and contacts? Read this figure and you will understand how and what to do.

So let's see what happened. If everything was soldered correctly, then you now have an adapter that can supply a video signal to VGA D-Sub to 15 pins of the projector. You can see how the final product should look like in the photographs presented in the article.

Examination

Pair wires with RCA plugs soldered to the ends will be useful to heat shrink to get more rigidity. In general, now you can connect the result of work and enjoy it (if everything was welded together as needed). Paired wires with RCA plugs attached to their ends can be heat shrunk to obtain greater rigidity.

In this case, we used a satellite tuner with a component video output on 3 RCA as a signal source and a Sanyo multimedia projector, where a separate video input of the same was not provided. If at the moment there is no way to make sure that the resulting adapter is working, then you can only carefully examine the entire structure and make sure that there were no omissions, and everything is soldered as indicated in the article.

What you need to understand

You should be aware that the considered adapter can ensure the operation and full functioning of a device that has a VGA video input, only if it can automatically detect the type of incoming video signal. An indicator of this will be the ability to select the mode in which data will be transmitted to RGB / YPbPr. Usage will be positively affected by sending these types of signals. Why is that?

The fact is that RGB and HV sync (as, for example, data coming from the output of a video card of a personal computer) is converted to RGB, which has sync pulses in the green channel (Y). This, in turn, is converted to the YPbPr color difference. As a result, we can conclude that these signals are not the same, although they can convey the same information. So take a close look at what a VGA RCA adapter looks like.

FAQ

Based on the data presented in the article, it can be assumed that the readers have some questions. However, this is not the first time this topic has been touched upon, so such information can be found without difficulty. We figured out how to make a DIY VGA RCA adapter. Now let's look at possible improvements.

What adapters can be made using twisted pair?

VGA extenders are special cables that have D-Sub 15 pin connectors on both ends, while their input and output work according to the same technology.
RCA (3xRCA) is used to carry component video signals. There are three connectors at each end. Used when working with a DVD player and TV.
RCA (D-Sub15pin) was discussed a little higher. Here component Y, Pr, Pb in VGA.
To transmit analog audio, two pairs of stereo signals (4 RCA connectors on each end) can be used simultaneously.

What is the Brown-Brown / Wht free pair for?

It can be used to transmit mono audio from a DVD player when there is an audio input on a multimedia projector (assuming it has speakers). Otherwise, it would be better to cut and insulate this pair. Therefore, you should think carefully about the aspects and how the VGA RCA adapter will be used.

How can I make a Scart VGA adapter?

If the video signal source has a full Scart video output, then such a device can be made without problems. To do this, pinout the contacts as follows (outputs first):

7 - blue;
11 - green;
15 - red.

Now the ground:

5 - blue;
9 - green;
13 - red.

Otherwise, everything is done as previously described in the article.

Conclusion

What can you say in the end? Carefully study the pictures presented and visualize in detail what and how you will do. During work, observe the utmost care and attention - after all, if you miss the ground, the consequences will be rather sad and very negative. The end result is not VGA RCA for technology, but the need to buy a new device for video playback. But if everything works out, then the connection of a computer, projector, TV and many other devices will not be a problem now. The main thing is to make sure that all pins are connected to the correct outputs, and no incidents will happen.

- an adapter that allows you to connect the video output of a computer with a regular color TV. Below we will consider several options for such an adapter, describe the pros and cons of each design, and give tips for making a VGA SCART adapter with your own hands.

Before getting started, one important clarification: all tips and instructions in this manual are presented “as is” and everyone uses them at their own risk.

VGA-SCART Pin Assignments

To understand the operation of the VGA SCART adapter circuits below, consider the different types of signals that need to be transferred from a computer to a TV.

RGB signal

The main signal that is transmitted through the cable from the computer to the TV is RGB signal with a breakdown into three components (R-red, G-green, B-blue) Fortunately, in this case the standard and SCART connectors are fully compatible (outputs: amplitude 0 , 7V, 75 ohm resistance). Therefore, you can directly connect the corresponding contacts without resorting to the use of special circuits or devices (we will consider this option later).

Common wire

In VGA and SCART connectors, several pins are connected to a common wire (ground), which are often connected to each other inside the cable. Their common connection allows you to negate various noise (especially in relation to the three RGB lines). The same applies for shielded cable.

Note: In fact, there is only one common wire, so it is normal that all contacts with the designation of mass are connected together.

720p / 60Hz, 1080p / 60Hz ...

Audio and video converter

Audio signal

In order to output sound to the TV, you need to take a cable with a standard 3.5 mm connector for a PC and connect it straight to the SCART connector. You can output both mono and stereo sound without resorting to the use of special devices and circuits. Just be careful not to confuse the audio-out with the audio-in, as the SCART have them side by side.

Commutation signals

As mentioned earlier, the SCART input can accept various types of signals. In order for the TV to understand what type of signal is input, there is a special contact "RGB Blanking" (pin 16). If a voltage of 0 ... 0.4V is applied to this contact, then the TV will wait for "Composite signal", if 1 ... 3V, then the signal is "RGB". The use of this type of signal is extremely important for the functioning of the VGA-SCART adapter, and as we will see later, there are various ways to obtain it.

Another conclusion that may interest us is "Swtch" (conclusion 8). This pin is for switching TV / AV mode. Also on some TVs this output allows you to set the "aspect" of the picture:

TV Mode - 0 to 2 V.
AV mode with a ratio of 16: 9 - 5 to 8V.
AV mode with a ratio of 4: 3 - from 9.5 to 12V.

If you do not supply a signal to this output, the TV will remain in its default state (TV mode), and then we will need to use the remote control to switch to AV mode.

Synchronization signals

This is where the most difficult part of building a VGA-SCART adapter begins. Synchronizing signals from a computer's video card is very different from the synchronization system used in a regular TV, so you need to resort to some tricks to make them compatible. The difference between most VGA-SCART adapter circuits is based on how to solve this problem.

In a computer, standard VGA uses two different signals for synchronization, one vertical (60 Hz) and one horizontal (31 kHz). Both signals operate according to TTL logic and therefore have a peak value of 5V. Finally, signals can be either positive or negative depending on the video mode used.

However, the TV only needs one composite sync signal with a peak value of about 1 ... 3V. Also, the horizontal frequency is much lower, about 15 kHz (vertical, and almost coincides 50 ... 60 Hz). Finally, the signal must always be negative.

The main problem we are facing is horizontal synchronization. Assembling the circuit for this transformation is a rather complicated task. In this case, as a rule, changes are made to the signal source itself (video card) using special software or even a modified VGA (like the famous ArcadeVGA) to get directly 15 kHz from the VGA output. We will consider this issue further.

Getting 15kHz clock signal by software

As mentioned in the previous section, the solution to the main problem when building a VGA SCART adapter is to obtain a horizontal sync signal at 15 kHz. As a rule, the solution is achieved through changes, mainly in the field of software, settings of the video card of a personal computer. In addition, the synchronization signals must be negative, i.e. with a constant level up to + 5V, which tends to zero during the pulse itself.

Soft-15kHz program

This interesting software for Winows XP / Vista, created by a German programmer, makes it possible to obtain a negative-type 15 kHz clock signal in a very simple way. It is compatible with most video cards and is very easy to use.

Its only drawback is that during the startup of the operating system, the signal from the video card remains at 31khz, so you cannot see anything until the end of Windows boot. Using the Soft15khz program is quite simple: after downloading, simply unpack the rar-archive with the program and run it (no installation is required), then click on "Install 15kHz" and restart the computer.

(1.4 MiB, downloaded: 2,464)

This is a powerful software for editing all parameters of a video card, including obtaining a sync signal at 15 kHz. The program is not free, although it can be successfully used in the shareware version (the only drawback in this case is the presence of a splash screen, which lasts about six seconds at startup). You can download the PowerStrip program from the official website.

Acquiring 15kHz clock signal by hardware

Let's now turn to the study of various VGA SCART adapter circuits, ranging from the simplest to the most complex. Let's start with the pinout of the VGA and SCART connectors:

Basic circuit with composite sync (only for ATI RADEON video cards)

pros: Easy to implement, no special components required.
Minuses: Requires external 5V and 12V power supply, only works with certain ATI Radeon graphics cards.

Basically, three RGB lines (VGA pins 1, 2, 3) are used, connected to the corresponding SCART pins (pins 15, 11, 7). It is also necessary to connect the common wires of each channel (of course, one common wire is enough, but for high-quality shielding it is better to use all of them). To do this, the pins from VGA (6,7,8) must be connected to 13, 9, 5 SCART.

Note: These connections are always the same in all adapter circuits. Dotted brown wire that connects VGA pins 10 and SCART 17 to the sync common wire. The black wire connects the shielded cable jackets of both connectors. Finally, the brown wire that runs from pin 13 of VGA to pin 20 of SCART carries the composite clock signal.

ATTENTION: In order for this VGA SCART adapter circuit to work, it is very important that the video card supports the clock mode on pin 13, which is usually absent in most video cards and only some video cards belonging to the ATI RADEON family can support this mode of operation.

Synchronization signal acquisition using diodes and resistors

pros: Works with any video card, the presence of the function of switching on by an external signal.
Minuses: External 12V power supply required.

Consider the first adapter circuit. In this case, the connection of lines R, G, B and mass is the same as in the previous diagram. The circuit allows you to use a regular video card (not generating a composite video signal). The sync signals from VGA pins 13 and 14 are mixed in a diode and 330 ohm resistor circuit, and then transferred to a regular 20-pin scart.

Using a bipolar transistor to mix the two sync signals provides good picture quality.

Instead of using an external power supply, 5V is taken from the 9 VGA pin. True, not all video cards are capable of providing this voltage, especially the older generation cards. In any case, all the latest VESA 2.0 compliant models should be fine. In this circuit, not 12V is connected to pin 8 (to turn on the AV mode), but 5V. When the TV supports aspect ratio switching at 5V, the ratio will be 16: 9 instead of 4: 3.

Adapter on the 74HC86 chip

Pros: Excellent quality and compatibility (works with any graphics card)
Minuses: By far one of the more complex schemes.

The VGA SCART adapter circuit is based on a 74HC86 integrated circuit (four Exclusive OR gates). An external 5V power supply is also required. The signals are mixed using exclusive-OR elements, the output of which is a composite signal of excellent quality. The adapter works with any TV, provides a negative signal at a frequency of 15 kHz.