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Old 22nd November 2008, 10:29 PM   #1
jitter is offline jitter  Netherlands
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Location: Eindhoven, The Netherlands
Default bypass capacitors

It's been a while since my last visit (about 4 years ago), but recently I felt the need again to play a bit with my audio equipment.

After fixing a defect in my Primare D20, I finally 'decomissioned' my 15 year old Nakamichi CD-4. It still works fine so it seems a shame to just put it somewhere out of the way. That's why I decided to go play around with it a little, see if I can improve the sound.

The DAC is a AD1865N and the analogue filter is based around a single in-line 9-pin version of the 5532. My first idea was to try some better opamps, so I put a socket on the PCB and made a SIP-9 to dual DIP-8 converter wired to take single opamps.

Currently I'm trying the OPA627, and I must say that, though the improvement is not shocking, I'm impressed.

The datasheet of the OPA627 says that bypass capacitors on the power lines are needed close to the IC's. However, when I take a look at the PCB of the CD-player, I can find no (ceramic) capacitors in the vicinity (the ones that are close are not in the power lines, I measured). Isn't that a bit strange or does the 5532 not need them?
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Old 22nd November 2008, 11:08 PM   #2
ccschua is offline ccschua  Malaysia
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try this one.

http://www.audio-gd.com/enweb/pro/diy/OPA.htm

I found OPA627 too clinical and dry. u may try opa Moon to have the most warm sound.
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Old 23rd November 2008, 08:21 AM   #3
jitter is offline jitter  Netherlands
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Looks interesting, those HDAMs, unfortunately there's very little space between the DAC and the RCA connectors. The SIP-9 to dual DIP-8 (actually one DIP-18 socket) converter I fabricated is the biggest I can fit without using wires. I'd like to keep signal paths as short as possible, esp. in this part of the audio circuit.

But my question remains: does the 5532 not need (HF) bypass capacitors?
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