Push Pull Amp

260

04:25:25

Opamp driven push pull amplifier.

published 4 years ago

sean1401032

4 years ago

Nice circuit, but some good improvements could be made. Currently your diodes are backwards and are, contrary to their intended purpose, accentuating the crossover distortion. Furthermore, for the diodes to work properly in creating a bias voltage, a small current must flow through them (think of VI curve of a diode). So adding some large resistors from the top of the diode stack to V+ and bottom to V- will do this. To make it even better, take the feedback loop from the output rather than the opamp out, this corrects for any flaw in the bus voltage.

sean1401032

4 years ago

Oh and also, your transistors are saturating and the Opamp is supplying most of the current to the load during that saturation, you want transistors with greater gain (perhaps Darlington)

sean1401032

4 years ago

In earlier message I mean to say BIAS rather than BUS, silly typo

johex

4 years ago

Great, thanks for the tip, will try.

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