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Old 29th May 2011, 02:02 AM   #4891
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trace it to a point and connect it there, look for transistor 412 ,you got a schematic?
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Old 29th May 2011, 02:06 AM   #4892
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Default here you go

it's on ic 701

Last edited by noSmoking; 29th May 2011 at 02:12 AM. Reason: image
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Old 29th May 2011, 02:14 AM   #4893
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Default can't up load

Can't upload the manual go google it JVC RC EZ31.
Good luck,
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Old 29th May 2011, 11:01 AM   #4894
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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.

Click the image to open in full size.

Any other suggestions?
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Old 29th May 2011, 05:09 PM   #4895
syklab is offline syklab  Hong Kong
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Quote:
Originally Posted by audio1st View Post
@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
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Old 29th May 2011, 09:58 PM   #4896
nezbleu is offline nezbleu  Canada
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Quote:
Originally Posted by Dr.H View Post
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.
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Old 30th May 2011, 05:18 AM   #4897
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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.
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Old 30th May 2011, 11:26 AM   #4898
hotiron is offline hotiron  Scotland
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This would make more sense both wires twisted and connected at the same point as close to vref as possible.
Attached Images
File Type: jpg dac vref gen.jpg (22.2 KB, 462 views)
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Old 30th May 2011, 12:32 PM   #4899
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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.
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Old 30th May 2011, 02:42 PM   #4900
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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).
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