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Chip Amps Amplifiers based on integrated circuits

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Old 10th July 2004, 03:59 AM   #1
drdagor is offline drdagor  United States
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Default Chip Amp as tracking supply for preamp

OK This may be totally off the wall, but here's the idea....

I've been looking for a low noise power supply for an ultra low noise pre-amp I'm building. (Transistor/IC... Please don't turn up your noses.) This is +/- 15 volt job.

Anyhow... I was looking at the spec for the National chip amps, and realized that they are just low noise op amps with high current output. The LM1876 (dual 2 amp devices in one package) is actually a good candidate for a dual tracking regulator.

The idea would be to build a traditional op amp regulator circuit for using 1/2 of the LM1876... (Apply a voltage reference to the non-inferting input, give it enough gain to get up to +15 volts, and let its own internal regulation and some bypass caps take care of the noise.) To generate the negative rail, you make the other half of the LM1876 a voltage follower, and drive the negative side with the mid point of the two rails. So the negative rail always tracks the positive rail. There is a circuit in Horowitz and Hill that pretty much describes this.

Does this sound worthwhile to any body else? Love to hear some comments.
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Old 10th July 2004, 08:26 AM   #2
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This has already been discussed. In fact you will find your proposed circuit in the OPA549 datasheet. No idea if anyone actually tried it.
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Old 10th July 2004, 11:53 AM   #3
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http://headwize.com/projects/showfil...lmore3_prj.htm

somthing like the psu in this maybe?
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