PC PSU running a LM1876 on Soundcard - diyAudio
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Old 19th October 2011, 01:41 AM   #1
dmx2020 is offline dmx2020  New Zealand
diyAudio Member
Join Date: May 2005
Location: auckland
Default PC PSU running a LM1876 on Soundcard

Hi to all,

This soundcard is an old (~1998) Ensonic AudioPCI E1370.

It is powered from the +12V (10A) and -12V lines (1A) of the PC PSU.

Looking at the datasheet for the LM1876, here, the LM1876 can only give ~8W at +/-12V.

So what can be done to increase power output from the LM1876:

1) Can the +5V and +12V, and -5V and -12V be joined to to give +/-17V? will the low current of the -5v be a problem?

2) Change rectifiers of -12V line to give higher current to match the +12V line? Will this make any difference, since the LM1876 will still draw essentially the same current at -/+12V?

3) Can you combine +5V and -12v, and -5V and +12V to give +/-17V?

4) Can anything else be done to increase the voltage from the PSU above +/- 12v? (mess with pin 1 of the tl494 pwm regualtor IC. etc?)

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