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Bobwire, cd tweaking experiences and questions on a sony cdp-xb920e

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Hello bob and anyone else reading this,

i've gotten serious in my plans to heavily modify a sony cdp-xb920e
for a start the analog section is a complete disaster. there is only one power supply trasformer running both analog and digital. batteries here we come. now for the analog section sla 12v batteries take care of the job. but for the +5v and +7v in the dac section, got any solutions in the application of batteries? will a whole bunch of NiMh rechargable batteries have low enough internal impedance to do the job?
or will running sla 12v batteries through voltage regulators be the only way (better then rectified ac, but not as good as pure battery supply)
the current +5v going to the dac has 40mV of ripple, not exactly good
also, the dac has a balanced output, and its current source. whats ur take on how to build an analog stage using balanced out. i've never done it before. as far as i can work out, three opamps will have to be used. know a way to reduce this?

thanks greatly,

Mark

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Re: Bobwire, cd tweaking experiences and questions on a sony cdp-xb920e bobwire 20:24:22 06/17/00 (0)
First, do you have a schematic? There isn't anything wrong per say at having only one transformer. But if you don't like it add another one in. I did for my old Magget box, some years ago. One just for the analog will do nicely. But first do up the main supply with larger filter caps. Then have a look at the caps around the rest of the unit. Like the DAC, do the caps feeding it too. Then maybe add a regulator for the laser unit. For the analog stage see if there are resistors in line with the voltages? Jumper them out if there are. Then add large caps all around that stage. What are the resistors in line with the output. I like to take those down to around 200 ohms total. Remove the little cap they ALWAYS put at the output. That will bring up the high end detail. After you've reworked the machine then decide if you still want to go balanced or not. If yes, then I would say copy the output stage it already has. That would be easy. Let me know how it goes, bobwire

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