Talk:Push–pull output

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Drawing Request

It would be amazing to have an actual drawing of a totem-pole schematic here :)

Be amazed. Dicklyon (talk) 22:22, 14 April 2011 (UTC)[reply]

Too bad it's not illustrating a push-pull output. I don't know what it's illustrating. PNP and NPN transistors? Collector of one hooked to the emitter of the other? It'd be nice to acknowledge the bias problem, as well. An incorrect picture is worse than no picture. --Wtshymanski (talk) 13:20, 14 September 2011 (UTC)[reply]

Better picture found, showing + and - power supplies and load, also a tube-type amp schematic with center-tapped transformer. --Wtshymanski (talk) 15:32, 14 September 2011 (UTC)[reply]

Expansion

As usual, no history - push-pull amplifiers are designed with out comment in the 1945 Radiotron handbook, so doubtless the technique is nearly as old as vacuum tubes. I've tried to put in some explanation as to *why* you would want these various perversions in a circuit, but I can't find any history yet. --Wtshymanski (talk) 21:43, 29 November 2012 (UTC)[reply]

Colpitts didn't claim the push-pull principle in 1915 and that's running pretty far back into tube history; one book suggests that carbon microphone capsules were used as telephone circuit amplifiers in push-pull, so maybe it wasn't considered a patentable innovation. --Wtshymanski (talk) 21:17, 30 November 2012 (UTC)[reply]

Also, the audion predated the vacuum tube, so if a push-pull system was devised using audion tubes, then the push-pull concept definitely pre dated vacuum tubes. An example of a push-pull carbon amplifier cn be found here (approx halfway down - Brown type V microphione amplifier though as it is dated to ~1924, it doesn't predate the audion claim). I have not found an example that predates this design but that doesn't mean that one doesn't exist. DieSwartzPunkt (talk) 09:53, 1 December 2012 (UTC)[reply]