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Old 20th October 2005, 06:47 PM   #1
DonoMan is offline DonoMan  United States
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Default Need help getting info on Class H+ chips

I have a Technics SA-DX950 that I want to add preamp outs to. I figure the easiest way to do this is to just tap (or trace back to somewhere else to tap from) the input signal to the amp chips, but I can't find a pin layout for them.

2ch MOS CLASS H+ RSN313H25 H1 122511
MOSFET 3ch CLASS H+ RSN310R37 H2 012214

Google has lots of results, but I can't find any real info in any of them.
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Old 20th October 2005, 06:50 PM   #2
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Easiest method might be just to spur off after the volume pot.
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Old 20th October 2005, 07:03 PM   #3
DonoMan is offline DonoMan  United States
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I found the opamps on the preamp board as being 4580s, damn are these things tiny to solder to! Gotta trace them somewhere else...

volume pot is not too easy, it's digital, and that whole circuit board at the front is a pain to get off.
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Old 20th October 2005, 07:11 PM   #4
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Hi DonoMan,

I'd recomend using a opamps as a buffers for the pre-out. I did a similar thing to my dad's solid state technics amp years ago. It picked up noise without the buffer.

Regards,
Werner
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Old 20th October 2005, 08:11 PM   #5
DonoMan is offline DonoMan  United States
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Oh yes, I plan to. It's just that I don't trust myself soldering to the opamps themselves. I have essential tremors, which is not a good thing to have when you want to do precision soldering.

I suppose I could just bring it to school and use an oscilloscope to find the pins I want.
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