Need help getting info on Class H+ chips

DonoMan · 20th October 2005, 06:47 PM

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.

pinkmouse · 20th October 2005, 06:50 PM

Easiest method might be just to spur off after the volume pot.

DonoMan · 20th October 2005, 07:03 PM

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.

sousmielie · 20th October 2005, 07:11 PM

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

DonoMan · 20th October 2005, 08:11 PM

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.

20th October 2005, 06:47 PM	#1
DonoMan diyAudio Member Join Date: Feb 2005 Location: Massachusetts	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.

20th October 2005, 06:50 PM	#2
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	Easiest method might be just to spur off after the volume pot. __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

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20th October 2005, 07:03 PM	#3
DonoMan diyAudio Member Join Date: Feb 2005 Location: Massachusetts	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.

20th October 2005, 07:11 PM	#4
sousmielie diyAudio Member Join Date: May 2005 Location: GP (Gangstas Paradise)	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

20th October 2005, 08:11 PM	#5
DonoMan diyAudio Member Join Date: Feb 2005 Location: Massachusetts	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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