vga rca connector. VGA-RCA adapter cable: description and purpose. What is the idea

Hi all. For a very long time, I had an old seventeen-inch monitor lying on the roof, which was covered in dust. It lay there for a long time, exactly until I accidentally came across an article about a signal converter from RCA (popularly “tulip”) to VGA. There, the author of the article connected the monitor to a satellite tuner, and used computer speakers instead of speakers.

I also decided to do the same trick with my old monitor, so to speak, to give it a second life as a TV in the kitchen. After ordering, namely 18 days later, I received the package by mail.

The device itself was packaged very well, namely wrapped in a bunch of layers of bubble wrap.

Having reached the contents, we have the following configuration:

1. Converter
2. power unit
3. VGA to VGA cable
4. RCA to RCA cable
5. S-video to S-video cable
6. Instructions in English.

Converter equipment

As you can see, the package is not small; all the necessary cords are already included.

I was very surprised by the coating of the converter housing itself. It is covered with soft touch, which feels a little like a rubber coating. It is thanks to him that the case is much less susceptible to any mechanical damage, and is so pleasant to the touch.

After the purchase, I received an unpleasant surprise from my old monitor. After lying on the roof, it refused to turn on, so for demonstration I connected the converter to another, now Led, monitor.

Everything connects very easily. Cable from the monitor, plug into the connector VGAOUT, plug the cable from the tuner or DVD into the connector VideoIN. The power supply is in the socket, and its output is in the connector 5 vPower. After this everything starts working.

Example of work

On my monitor, a perfect picture immediately appeared, even taking into account that the signal comes through an analog RCA cable. The converter has a menu that allows you to adjust some parameters, such as brightness, image offset, but I didn’t touch anything there. We only used the mode button, which is responsible for switching the screen extension, selecting the desired extension specifically for my monitor.

If you decide to make yourself the same TV from a monitor, I recommend this particular adapter, since its quality of work is at the highest level.

I bought Here. The seller is very good, sent the goods on the second day.

Thanks everyone for watching.

PS. Old monitor repaired, there was a crack on the TDKS.

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

What is a VGA RCA adapter

Scheme 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 for 15 pins. The device discussed here can be used to connect a DVD player or satellite tuner to a multimedia projector. Of course, provided that it is not possible to work directly using 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 (twisted pair type CAT5/CAT5e) designed to transmit video signals. We will use it because 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 cable. The last part is better to use shielded STP than UTP. But this one is more difficult to get, which affects the price. Therefore, the issue of possibilities and desires is considered here. There is no particular difference between the elements, but there is one nuance: it is better to use UTP if the cable length is less than 10 meters. If the distance is greater, then it would 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 - Wht\Brown.
6 - Ground R-Y (Pr) - Wht\Red.
7 - Ground Y - Wht\Green.
8 - Ground B-Y (Pb) - Wht\Blue.
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 wire connectors and contacts? Check out this picture 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 on the 15 pins of the projector. What it should look like final product, you can see in the photographs presented in the article.

Examination

Wire pairs with RCA plugs soldered at the ends can be usefully compressed with heat shrink to obtain greater rigidity. In general, now you can connect the result of your work and enjoy it (if everything was soldered together as needed). Paired wires, at the ends of which RCA plugs are attached, can be crimped with heat shrink to obtain greater rigidity.

In this case, we used a satellite tuner with a 3 RCA component video output as a signal source and a Sanyo multimedia projector, which did not have a separate video input of the same type. If on this moment There is no way to verify the functionality of the resulting adapter, you can only carefully inspect 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 adapter in question 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 impacted by sending these types of signals. Why is that?

The fact is that RGB and HV.sync (as, for example, the data coming from the video card output personal computer) is converted to RGB, which has a sync pulse in the green channel (Y). It, in turn, turns into the color-difference YPbPr. And as a result, we can conclude that these signals are not the same thing, although they can convey the same information. Therefore, carefully study what a VGA RCA adapter looks like.

FAQ

Based on the data presented in the article, it can be assumed that readers have some questions. However, this is not the first time such a topic has been raised, so such information can be found without difficulty. We found out how to make a VGA RCA adapter with your own hands. Now let's look at its 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 use the same technology.
• RCA (3xRCA) is used to transmit component video signals. There are three connectors at each end. Used when working with DVD player and TV.
• RCA (D-Sub15pin) was discussed a little higher. Here are the components Y, Pr, Pb in VGA.
• To transmit analog sound, two pairs of stereo signals can be used simultaneously (4 RCA connectors at each end).

Why is a free Brown-Brown/Wht pair needed?

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 this pair and insulate it. Therefore, you should carefully consider the aspects and how the VGA RCA adapter will be used.

How can I make a Scart VGA adapter?

If the video source has a full Scart video output, then such a device can be made without problems. To do this, pinout the contacts is carried out 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

Any final words? Carefully study the presented drawings and mentally imagine in detail what and how you will do. During work, exercise extreme caution and attentiveness - after all, if you miss the grounding, the consequences will be quite sad and very negative. The result is not VGA RCA for equipment, but the need to buy a new device for video playback. But if everything works out, then connecting a computer, projector, TV and many other devices will not be a problem now. The main thing is to make sure that all the pins are connected to the required outputs, and no incidents will happen.

But at the same time, we can raise the question of the profitability of assembling this adapter. The fact is that you can buy it for 100-150 rubles, which is not a high price. Time spent creating an adapter on your own will end up costing more in the long run. The only acceptable option is if everything is already there, and you just need to make this device. From a purely amateur point of view, such experience can be valuable if one has an eye on work closely related to the restoration and creation of similar devices in the future.

Those who own a significant amount of audio and video equipment are faced with a choice: make it yourself or purchase an adapter from the store that will convert signals of different types. Needless to say, factory devices cost a lot, but you can often do without them. And within the article we will talk about how to make a VGA to 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 for 15 pins. The device reviewed here can be used to connect a DVD player or satellite tuner to a multimedia projector. Of course, provided that it is not possible to work directly using 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 (twisted pair type CAT5/CAT5e) designed to transmit video signals. We will use it because 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 cable. The last part is better to use shielded STP than UTP. But this one is more difficult to get, which affects the price. Therefore, the issue of possibilities and desires is considered here. There is no particular difference between the elements, but there is one nuance: it is better to use UTP if the cable length is less than 10 meters. If the distance is greater, then it would 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 - Wht\Brown.
6 - Ground R-Y (Pr) - Wht\Red.
7 - Ground Y - Wht\Green.
8 - Ground B-Y (Pb) - Wht\Blue.
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 wire connectors and contacts? Check out this picture 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 on the 15 pins of the projector. You can see approximately what the final product should look like in the photographs presented in the article.

Examination

Wire pairs with RCA plugs soldered at the ends can be usefully compressed with heat shrink to obtain greater rigidity. In general, now you can connect the result of your work and enjoy it (if everything was soldered together as needed). Paired wires, at the ends of which RCA plugs are attached, can be crimped with heat shrink to obtain greater rigidity.

In this case, we used a satellite tuner with a 3 RCA component video output as a signal source and a Sanyo multimedia projector, which did not have a separate video input of the same type. If at the moment it is not possible to verify the functionality of the resulting adapter, then you can only carefully inspect 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 adapter in question 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 impacted by sending these types of signals. Why is that?

The fact is that RGB and HV.sync (for example, data coming from the output of a personal computer’s video card) are converted to RGB, which has sync pulses in the green channel (Y). It, in turn, turns into the color-difference YPbPr. And as a result, we can conclude that these signals are not the same thing, although they can convey the same information. Therefore, carefully study what a VGA RCA adapter looks like.

FAQ

Based on the data presented in the article, it can be assumed that readers have some questions. However, this is not the first time such a topic has been raised, so such information can be found without difficulty. We found out how to make a VGA RCA adapter with your own hands. Now let's look at its 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 use the same technology.
• RCA (3xRCA) is used to transmit 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 are the components Y, Pr, Pb in VGA.
• To transmit analog audio, two pairs of stereo signals can be used simultaneously (4 RCA connectors at each end).

Why is a free Brown-Brown/Wht pair needed?

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 this pair and insulate it. Therefore, you should carefully consider the aspects and how the VGA RCA adapter will be used.

How can I make a Scart VGA adapter?

If the video source has a full Scart video output, then such a device can be made without problems. To do this, pinout the contacts is carried out 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

Any final words? Carefully study the presented drawings and mentally imagine in detail what and how you will do. During work, exercise extreme caution and attentiveness - after all, if you miss the grounding, the consequences will be quite sad and very negative. The result is not VGA RCA for equipment, but the need to buy a new device for video playback. But if everything works out, then connecting a computer, projector, TV and many other devices will not be a problem now. The main thing is to make sure that all the pins are connected to the required outputs, and no incidents will happen.

But at the same time, we can raise the question of the profitability of assembling this adapter. The fact is that you can buy it for 100-150 rubles, which is not a high price. Time spent creating an adapter on your own will end up costing more in the long run. The only acceptable option is if everything is already there, and you just need to make this device. From a purely amateur point of view, such experience can be valuable if one has an eye on work closely related to the restoration and creation of similar devices in the future.

The VGA-RCA adapter cable is used to connect audio and video devices. For example, you can use it to connect a DVD player or a satellite tuner that has an analog component video output to a multimedia projector with a component video input. Quite often, users of household equipment are faced with a choice: buy a VGA-RCA adapter (or extension cord) 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 yourself 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

To make the subject of our conversation, it is recommended to use (as a conductor) a CAT5 twisted pair computer cable (it is better to use a shielded one), 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-tulip type 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;
• Pins 4, 5, 9, 10, 11, 12, 13, 14, 15 are not used.

Thus, the VGA-3 RCA adapter requires only six pins. If you are using a twisted pair cable, then use colored pairs of wires to wire each cable. For greater rigidity, it is recommended to crimp the ends onto which the RCA connectors are soldered with heat-shrinkable casing. That, in fact, is the whole description. The resulting RCA-VGA adapter supplies a component video signal to the VGA input.

Application

Very often they try to use a VGA-RCA adapter to supply a component video signal to computer monitor. However, this cannot be done; the adapter will not work. This is due to the fact that the computer monitor does not receive the color difference component signals produced by the DVD player, but rather the RGB component. To ensure the functionality of such a connection, the use of a special transcoder is required.

Conclusion

The described method of making an adapter can be used for other similar products: 3 x RCA - 3 x RCA, VGA to VGA extension cables, etc. For example, you can make an adapter for S-Video cable or “Skart”, the most important thing is to use the correct pinout of these connectors. The use of twisted pair makes such adapters and extension cords very cheap to produce. If you need a short adapter, you can use an unshielded cable, this will 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 cable with a copper screen. This will ensure high quality transmitted component video signal. It’s better not to skimp on this element, because no one will like watching a movie while “snow” or stripes appear on the screen, distorting the picture. It’s better to do it well once than to redo it and eliminate shortcomings.

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

Before we begin, one important clarification: all advice and instructions in this manual are provided “as is” and are used at your own risk.

VGA-SCART pin assignments

To understand the functioning of the following VGA SCART adapter circuits, consider Various types signals that need to be transmitted from the computer to the TV.

RGB signal

The main signal that is transmitted via cable from the computer to the TV is an RGB signal divided into three components (R-red, G-green, B-blue). Fortunately, in this case, the standard and SCART connector are fully compatible (outputs: amplitude 0 .7V, resistance 75 Ohm). 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

VGA and SCART connectors have several pins connected to a common wire (ground), which are often connected to each other inside the cable. Their common connection makes it possible to eliminate various interferences (especially in relation to the three RGB lines). The same applies to shielded cable.

Note: there is essentially only one common wire, so it is normal that all contacts marked with ground are connected together.

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

Audio and video converter

Signal Audio

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 directly 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 output with the audio input, since SCART has them next to each other.

Switching signals

As mentioned earlier, the SCART input can accept different types of signals. In order for the TV to understand what type of signal is supplied to the input, there is special contact"RGB Blanking" (pin 16). If on this contact apply a voltage of 0…0.4V, then the TV will expect a “Composite signal”, if 1…3V, then the “RGB” signal. 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 get it.

Another pin that might interest us is “Swtch” (pin 8). This pin is intended for switching TV/AV mode. Also on some TVs, this pin allows you to set the aspect ratio of the image:

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

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

Synchronization signals

This is where the most difficult part about building a VGA-SCART adapter begins. The synchronization of signals on a computer's video card is very different from the synchronization system that is 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 ways 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 hence have a peak value of 5V. Finally, the signals can be either positive or negative depending on the video operating 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, but 50...60 Hz is almost the same). Finally, the signal should always be negative.

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

Receiving a 15 kHz clock signal using software

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

Soft-15kHz program

This interesting software for Winows XP/Vista, created by a German programmer, allows you to very in a simple way receive a 15 kHz negative type synchronization signal. It is compatible with most video cards and is very easy to use.

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

(1.4 MiB, downloads: 2,464)

This is powerful software for editing all video card parameters, including obtaining a 15 kHz clock signal. 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 that lasts about six seconds upon startup). You can download the PowerStrip program from the official website.

Receiving a 15kHz clock signal in hardware

Let us 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 timing (ATI RADEON video cards only)

• pros: Easy to implement, does not require any special components.
• Minuses: Requires external 5V and 12V power supply, only works with certain ATI Radeon video cards.

Basically, three RGB lines are used (VGA pins 1, 2, 3) 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 VGA pins (6,7,8) must be connected to 13, 9, 5 SCART.

Note: these connections are always the same in all adapter circuits. The dotted brown wire that connects pins 10 VGA and 17 SCART is the common sync signal wire. The black wire connects the shielded cable sheaths of both connectors. And finally, the brown wire that goes from VGA pin 13 to SCART pin 20 transmits 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 signal mode on pin 13, which is usually missing on most video cards and only some video cards belonging to the ATI RADEON family can support this mode work.

Receiving a clock signal using diodes and resistors

• pros: Works with any video cards, the function is turned on by an external signal.
• Minuses: Requires external 12V power supply.

Let's look at the first adapter circuit. In this case, the connections of the lines R, G, B and ground are the same as in the previous diagram. The circuit allows you to use a regular video card (not generating a composite video signal). The clock signals from VGA pins 13 and 14 are mixed in a circuit of diodes and a 330 ohm resistor, and then sent to a regular 20-pin Scart.

Usage bipolar transistor for mixing two synchronizing signals provides good quality Images.

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

Adapter based on 74HC86 chip

• Pros: Excellent quality and compatibility (works with any video cards)
• Minuses: Definitely one of the most complex schemes.

The VGA SCART adapter circuit is based on the 74HC86 integrated circuit (four XOR 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 and provides a negative signal at a frequency of 15 kHz.