Finally, an affordable CD Transport: the Shigaclone story

[noSmoking]

trace it to a point and connect it there, look for transistor 412 ,you got a schematic?

[noSmoking]

it's on ic 701

[noSmoking]

Can't upload the manual go google it JVC RC EZ31.
Good luck,

[merlin2069er]

I do have the manual. Ok, that's the trace (pin hole trace) that I broke off the board.

I might be able to use some thin (wire wrap) to attach to the trace.



Any other suggestions?

[syklab]

Originally Posted by audio1st

@BMW850

This picture may be clearer where to add 5V, (point 5A). The switch is only needed if you wish to compare between original supply and a new, separate 5V supply.

I read from Peter that the 5V can be added by tap into the L901 after removing it.

Peter,
After you removed the choke L901, do you have to put 2 jumper wire there to reconnect the trace line?

Thanks

[nezbleu]

Originally Posted by Dr.H

Out of curiosity, I ran the circuit as JOHNW presented it (i.e. no power supply). To my surprise, the output was holding at 2.5V.... so the short answer is there is no need for a powersupply to run the NE5534 off +-5V!!

Are you seriously saying that you ran a "regulator" circuit with no power to the error amp??? If so, it wasn't regulating anything, and any voltage you measured on the output was coming from somewhere else.

[Dr.H]

Yes nezbleu, embarrasingly, that is exactly what happened.
Try it, measure it, listen to it, post results here...plus an explanation for what is happening. I'm not sure.

[hotiron]

This would make more sense both wires twisted and connected at the same point as close to vref as possible.

[Dr.H]

I would agree. It would certainly be more in line with the normal application note for op-amps.
Still, I measured 2.5Vout without the Vss and Vcc being supplied to the op-amp. In addition, I was able to adjust this output voltage (at pin 6 of the op-amp) through adjsuting the pot connected to the LM317 I was using.

[merlin2069er]

Hi. How much of the transport should stick up from under the case?

Does anyone have a template for the CD cutout?

I'm almost done, just have to finish the top cover (and fix a trace).