Amplifier from HCD-RG295

[FlllP]

Hello, I disassembled HCD-RG295, its an audio system with CD, Decks, radio, and amplifier, and I want to take amplifier from it and make it work with aux, but I am not very much knowledgeable of what to do to make it work.

I would be happy if it had like aux, volume control, and that's all.

I have attached the schematics of the boards that there are. There are Transformer board, Amplifier board, Aux board, and available schematics for those. if you need more pics, let me know.

So if anyone is willing and have free time to help me make this thing work somehow.

Thank you all!

 

[AnalogSteph]

Erm, why did you take the thing apart in the first place? Too bulky, I guess? If I am not mistaken, there is an AUDIO IN jack complete with a button on the front panel and the remote.

If you want that, the minimum amount of boards required would be:
MAIN
MIC-AUX-HP
PANEL + KEY b'ds
POWER
TRANSFORMER
(And that's assuming the main micro is not freaking out when the rest isn't there...)

With just TRANSFORMER + POWER (and a mains switch with filter capacitor to take over the function of the relay, since the power supply section for the relay supply resides on the MAIN b'd) you could assemble a decent enough power amplifier, though you may want to study the STK's datasheet regarding minimum stable gain as right now it's approaching 34 dB.

Now you could just wire up a standard stereo logarithmic volume pot (no higher than 10k, maybe even 5k/4.7k, I'd say) to the input (pins 6-8 at CN441 - R-OUT, A-GND, L-OUT), with maybe the MIC-AUX-HP b'd providing the input jack unless you want to wire up RCAs instead. Do you know how to do this? That ought to work decently enough. If your sources don't mean driving that, this could be an easy route. I wouldn't even do anything about the gain then.

You can also buy assembled preamp boards (NE5532, volume, tone, regulators and rectifiers), but you'd be in a minor pickle when it comes to the power supply side. The spare secondaries AC3 and AC4 were previously used to supply 9.6 and 12.7 V DC after rectification, respectively, so the typical +/-12 or 15 V supply seems out of the question. I guess you could connect them in series and obtain roughly + and -11.15 V unregulated. That would mean a 7808 and 7908 for +/-8 V, or 7809/7909 for +/-9 V if you're feeling adventurous... 78M/79M series types should be more than powerful enough. (If you had something with adjustable LM317/337 regs, you'd be super flexible.)
I mean, you could mess around with voltage doublers if you really insist, but it doesn't exactly make things any more reliable. And it's not like +/-8 V would be inadequate for what you need.
Do you have any previous experience working with regulated linear power supplies?

 

[FlllP]

Erm, why did you take the thing apart in the first place? Too bulky, I guess? If I am not mistaken, there is an AUDIO IN jack complete with a button on the front panel and the remote.

If you want that, the minimum amount of boards required would be:
MAIN
MIC-AUX-HP
PANEL + KEY b'ds
POWER
TRANSFORMER
(And that's assuming the main micro is not freaking out when the rest isn't there...)

With just TRANSFORMER + POWER (and a mains switch with filter capacitor to take over the function of the relay, since the power supply section for the relay supply resides on the MAIN b'd) you could assemble a decent enough power amplifier, though you may want to study the STK's datasheet regarding minimum stable gain as right now it's approaching 34 dB.

Now you could just wire up a standard stereo logarithmic volume pot (no higher than 10k, maybe even 5k/4.7k, I'd say) to the input (pins 6-8 at CN441 - R-OUT, A-GND, L-OUT), with maybe the MIC-AUX-HP b'd providing the input jack unless you want to wire up RCAs instead. Do you know how to do this? That ought to work decently enough. If your sources don't mean driving that, this could be an easy route. I wouldn't even do anything about the gain then.

You can also buy assembled preamp boards (NE5532, volume, tone, regulators and rectifiers), but you'd be in a minor pickle when it comes to the power supply side. The spare secondaries AC3 and AC4 were previously used to supply 9.6 and 12.7 V DC after rectification, respectively, so the typical +/-12 or 15 V supply seems out of the question. I guess you could connect them in series and obtain roughly + and -11.15 V unregulated. That would mean a 7808 and 7908 for +/-8 V, or 7809/7909 for +/-9 V if you're feeling adventurous... 78M/79M series types should be more than powerful enough. (If you had something with adjustable LM317/337 regs, you'd be super flexible.)
I mean, you could mess around with voltage doublers if you really insist, but it doesn't exactly make things any more reliable. And it's not like +/-8 V would be inadequate for what you need.
Do you have any previous experience working with regulated linear power supplies?

Weeeeelll, the flat cables connecting the boards fell apart... and it didnt work after that... i tried soldering connectors with wires, but it wasn't successful...

I thought using only Trasformer and AMP board, and maybe aux board, and somehow attach audio input on amp board somehow where is the CN441 connector if that's possible.

I don't want to use main board because it needs all connectors attached for it to work...

I don't have much experience in this, I mean I know how some things work, but when it comes to this, I am not sure.

If the main board switches the relay on AMP board, i guess via connector CN441, do we know how so, so we can override it, or I have to just put 9v with a switch to the AMP Relay(I don't mind that) for it to switch?

 

[FlllP]

I already overridden relay on transformer board because I couldn't get it to switch.

 

[FlllP]

Oh and also, Power Board is AMP board, I am not sure why its marked as Power board...