Audio Amplifier

460

07:00:28

Audio amplifier which uses a potentiometer with an op-amp to control volume output of an 8 ohm speaker. The setup uses a push-pull BJT transistor setup to provide the necessary current for the speaker. Each push pull BJT is connected to a current source, this always keeps them on and eliminates the distortion from the need BJT turn on voltage at each base, as well as keeps the signal swing centered around ground at 0V.

published 9 years ago

hurz

9 years ago

What you think its a current source is just a BJT wired as diode! So actually together with the two diodes you have connected 4 in series at 2*6V=12V which cause an extremely high current to them and would destroy them probably. Check other circuit topologies how its made better. Simple resistors are already a better solution. Keep it up.

agosbellacell

9 years ago

400 mA ok

hurz

9 years ago

With >5A for biasing is not ok.

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