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Old 12th May 2011, 01:00 AM   #41
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It's quite trivial. Look at the high voltage amp circuit in Horowitz & Hill often used for driving piezoelectric devices. No 1000V PNP devices! It's a totem pole originally seen in TTL logic circuits. The upper devices charges, the lower device pulls both the output and the upper base/gate down using a diode. Though it looks like it couldn't possibly be linear, 0.1% THD is easily possible with good feedback.
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Old 12th May 2011, 01:13 AM   #42
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Quote:
Originally Posted by latala View Post
Could any of you design a Dc coupled amplifier using NPN devices only !!!
Perhaps a nice variation on Son of Zen.

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