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Composite Mod Questions


Wooba

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I've already posted here that I can't get sound through RF and the only solution I've found is the composite mod which I was probably going to end up doing anyway. However, I'd really like to not just rip out stuff out of the board completely or at all if possible. I was thinking of just lifting one of the legs of the resistors and lifting the vcc leg of the transistor that I need to remove and doing the same to the modulator. Will this work or am I completely wrong about everything I just posted here?

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You could use of Bryan's UAV boards and not remove a thing from the Atari. Pick up the video signals from pins on the TIA chip (under the board) and get audio by soldering a wire to the junction of the two audio channel resistors near the RF modulator. +5V and ground can come from wherever you need them to, again without need of removing anything.

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The two clear and silver, 820pf polystyrene capacitors are more than likely to blame for the lack of audio. order a refurb kit from Console5 and replace those with the new ones and you should have audio again. Here's a link to the 2600 kit-

 

https://console5.com/store/atari-2600-total-refresh-kit-new-capacitors.html

 

I also agree that if you are going to mod your system, use Bryan's UAV. I've heard nothing but good things about it.

To pick up audio , even with the mod, I think you'll need to replace the two polystyrene capacitors. Someone can correct me if I'm wrong. Either way, it won't hurt to replace the old caps and voltage regulator with new ones while you have the system apart.

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To pick up audio , even with the mod, I think you'll need to replace the two polystyrene capacitors. Someone can correct me if I'm wrong.

 

depends if they died shorted or open, course you could cut a trace, add 2 resistors and 2 caps and make it stereo and not be assed with it at all :P

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You could use of Bryan's UAV boards and not remove a thing from the Atari. Pick up the video signals from pins on the TIA chip (under the board) and get audio by soldering a wire to the junction of the two audio channel resistors near the RF modulator. +5V and ground can come from wherever you need them to, again without need of removing anything.

So I just looked into that and it seems like a great option! I've also tried fiddling with the 2 capacitors and that didn't change anything, I've also re-flowed a little bit of solder because that had helped me with before but it also didn't do anything. So they're either completely dead or they're not the problem. I'll replace them anyway.

 

 

 

I've also had a look into the capacitor replacements, does it matter the type of capacitor used? For example, this store sells polystyrene capacitors, but they're radial, would that make a difference? Could I use any other type of capacitor that isn't even polystyrene?

Edited by Wooba
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So I just looked into that and it seems like a great option! I've also tried fiddling with the 2 capacitors and that didn't change anything, I've also re-flowed a little bit of solder because that had helped me with before but it also didn't do anything. So they're either completely dead or they're not the problem. I'll replace them anyway.

 

 

 

I've also had a look into the capacitor replacements, does it matter the type of capacitor used? For example, this store sells polystyrene capacitors, but they're radial, would that make a difference? Could I use any other type of capacitor that isn't even polystyrene?

As long as they are the correct value, it shouldn't matter.

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