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Old 31st January 2007, 09:14 AM   #5521
SimontY is offline SimontY  United Kingdom
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Also, do you want to use Black Gates before each regulator? You could just play it safe with 25v caps of a cheaper variety (Panasonic Fc etc.). If I've learnt one thing about value for money in upgrading this CD player it's to save the most expensive caps for local decoupling. This means the caps right next to the DAC, decoder, servo and op-amps.

Simon
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Old 31st January 2007, 09:21 AM   #5522
poynton is offline poynton  United Kingdom
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Quote:
Originally posted by SimontY

.............. Simon?

Simon (lol)...............
Perhaps we should re-christen you 'montY' ??

Andy
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Old 31st January 2007, 09:24 AM   #5523
poynton is offline poynton  United Kingdom
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Quote:
Originally posted by SimontY




Also, might it be wise to NOT take the voltage for the clock, op-amps and everything else from this one supply?

Perhaps the clock and op-amps should take their voltages from different places. I'd suggest a dedicated transformer is used to power the clock.

Agreed, it would provide better psu isolation with obvious results !

16v with 25v Pana FC caps ? - I could live with that suggestion.

Andy
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Old 31st January 2007, 12:44 PM   #5524
Gooch is offline Gooch  United States
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Quote:
Originally posted by poynton


Are we talking commercial disks or CD-R / CD-RW ??

It will play some commercial and some CD-R
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Old 31st January 2007, 09:35 PM   #5525
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Quote:
Originally posted by poynton


Can we have a name and a picture for these mystery caps ??

Andy
The caps are Samxon GC series
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Old 1st February 2007, 06:56 AM   #5526
YoungSC is offline YoungSC  Australia
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Thanks for the info guys.

I will go away and do some research. A couple of questions to get me started:

1) Does the supply to a separate transformer come from mains before the main transformer, or does it take a feed from one of the lower voltage windings?

2) I was thinking of running the 5V regs from this new board and the 12V regs from C803. Does this sound reasonable?

Thanks

Simon (from Oz)
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Old 1st February 2007, 07:21 AM   #5527
YoungSC is offline YoungSC  Australia
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3) Or having reviewed Simon (Monty's) comments, perhaps I should have the new board running 12V and C803 providing power to the 5V board.
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Old 1st February 2007, 08:52 AM   #5528
SimontY is offline SimontY  United Kingdom
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I'll modify my power supply diagram to show you what you might want to build.
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Old 1st February 2007, 09:37 AM   #5529
SimontY is offline SimontY  United Kingdom
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Does this help you???

I've tried to make it as clear, logical and "good" as possible.

Red wires are positive voltage, green ones are ground.

There's one transformer, two power supplies and 4 regulators. This gives you 3x5vdc and 1x12vdc.
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Old 1st February 2007, 09:53 AM   #5530
poynton is offline poynton  United Kingdom
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Quote:
Originally posted by Gooch



It will play some commercial and some CD-R
If you have cleaned the lens and 'serviced' the mechanism, I would suspect that the laser is on the way out.

If you can, check by substitution. They are not that expensive for a new unit, anyway.

Andy
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