Amp

133

02:51:20

I manage to copy this amplifier from one of my diagrams, I wanted to check it. Managed o fix thanks for the help.

published 10 years ago

stanislav_maslovski

10 years ago

Vicoelho, because you use two pnp transistors in the last stage, you have to feed them out of phase if you want this stage to operate as a class B push-pull. Currently, your circuit eats 600 mA from battery with just about 7 mA in the load, i.e., does not really work. You see any output just because of asymmetry in the two halves of the totem pole. Either replace the top transistor by npn one (with the collector connected to the plus of the battery) or change the way how you feed the two pnps. You can find examples in some of my circuits.

Vicoelho

10 years ago

Thank you for the help.

stanislav_maslovski

10 years ago

I see you changed the circuit but it is still incorrect... you should have npn on top and pnp at the bottom with emitters connected at the middle.

Vicoelho

10 years ago

Sorry new to this, I kind of see your point, so I changed to transistors, and lower one of the resistors from 4.7k to 470 ohms. Got a higher output but it's a bit out on the negative side of the sine wave. Do you think it would work, or what can I do to make it better.

Sine_eyed

10 years ago

If ya don't have an oscilloscope on your work bench, this type of situation right here is where you're gonna get your money's worth outta EveryCircuit! There is (very) much to learn about transistor amplifiers and in my opinion, developing a fundamental understanding of component functions found therein is essential if one hopes to design a well working real life build..

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