4/10/2023 0 Comments Totem pole transistorOf course, I would never design a NEW amplifier with the totem-pole configuration.but there's still a lot of good audio gear out there with this topology. WBG diodes and transistors have enabled totem-pole bridgeless power factor correction to become the dominant solution for many applications, in particular. Even the "golden ears" guys admitted that they were audibly indistinguishable from the vacuum tube predecessors, in most cases. Evidence of this is that they were almost universally used in Leslie speakers and early Yamaha electric organs. Typically, these relied on negative feedback to help even things out.and actually they sound pretty good. One of the problems with the totem pole circuit is that the "upper" transistor operates as an emitter follower while the lower transistor operates in common emitter.creating a very asymmetrical output gain. The first signal level FET transistors were built in the late 1950’s while power MOSFETs have been available from the mid 70’s. The totem-pole circuit was an interim design, made necessary by the lack of decent PNP power transistors, which, later on, made the true complementary-symmetry amplifier practical. I work on a lot of vintage and semi-vintage audio gear, and I'm still amazed at how much old school "totem pole" transistor amps are still out there.and running just fine, thank you. The 470 W resistors drop up to 5 V if an output buffer current approaches 10 mA, reducing the drive to the output transistors.
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