Finally, an affordable CD Transport: the Shigaclone story

[Dr.H]

The C906 that I refer to is an electrolytic and thus the 0.1uF is the correct one.

 

[Audiohifi]

Hi Dr H
Thanks for explaining. ZAR25H is a 2.5V regulator right
Is possible to use LM336-2.5 as regulator or Vref?
What is the value of the zener shown in your schematics?

Audiohifi

 

[syklab]

Hi Dr.H,
Clipped section of the C906.

Hi Dr.H,

There seems to be a typo in the RCEZ31 document. There are 2 C906, one with 330P and the other one is 0.1U. So the the From Vref and To Vref should connect to the C906;s positive leg which is connected directly to the pin 10 (TH) of the IC901 LA9242M. Is it correct?

 

[Dr.H]

You can use ANY 2.5v reference

 

[Erik van Voorst]

I have posted a few questions about Rubidium clocks for our clone on a lot of fora over the world.
Unfortunately no one answers (even not from guys who tell they are busy or going to be busy with those clocks) also an aggresive post from a commercial clock guy we all know....(something to do with "camping" )..must have done something wrong to him in the past...

Anyway in order to be able to ask questions one has to become a member and tell about himself...etc.

Here is one of my links this time "in english" where I introduced myself and posted pics of some diy homebuilt stuff maybe fun to read...

Hi There...My homebuild stuff - The Art of Sound Forum

 

[Dr.H]

Hi Syklab, those schematics look correct and the right C906 is the electrolytic one

 

[noSmoking]

so Is this the one being used?

Is this the vref being used in the shing a clone,
How are you adjusting it with a LM317?
Is the drawn schematic not the right location to pin 10 or 906 .1 cap
and vref in and out connect to the same place + 906 .1 cap? ,
where is the best place to supply the vref from?
Some one care to make me a drawing,Please!!!!
This all is getting confusing,

Thanks!

 

[merlin2069er]

help, broke cd door trace

hmm, I broke the CD door close trace on the board.

I removed the little connector and tried soldering up the wires directly to the board (I lost the cable with plug)...

Any suggestions?

 

[noSmoking]

you need to get a switch

hi,
Get a regular switch(on/off )ON is normal and 2 wires and solder it on the traces,just turn it off and back to on and your in business!
I hooked up a switch directly to the board, picture enclosed,a cherry or any small switch will work.

 

[merlin2069er]

I've got a no/nc switch that I was going to use with the shigaclone.

But one of the pinhole traces fell off when I tried soldering up a wire to it.

I might be able to follow the trace a bit further down, or exposing part of the trace, but I'm worried I might really mess it up.

 

[noSmoking]

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

 

[noSmoking]

here you go

it's on ic 701

 

[noSmoking]

can't up load

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]

@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]

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).