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In Reply to: Paul's Zener Discovery #6 posted by mark on April 23, 2002 at 08:16:59:
We tried these variations and a few others a few years back when we first introduced the stock circuit. The reason the top two zeners are there in the CCS is so that the top grid is referenced to ground while the bottom grid was referenced to the power supply. If there is any noise in the power supply, it is thus cancelled, but it requires that the zeners be unbypassed (else the noise is amplified). This gave us a lot of power supply immunity which is what we were after. If the power supply is completely quiet, then the noise of the zeners might be more important.This is one argument for B- and B+ regulators, however a failure in such a regulator could result in catastrophic failure so we have avoided regulators for this reason. Being that we have to convince the world that OTLs are reliable (to counteract the Futterman/Rosenburg legacy) this is one of the choices that has to be made.
IOW, if you really want to take advantage of this change, power supply regulators would really help.
One way to get around the regulator failure issue might be to run the regulators for the voltage amplifier only.
-Ralph
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- Re: Paul's Zener Discovery #6 - Ralph 14:16:34 04/23/02 (0)
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