andrypilot

modified 10 years ago

Simple amplifier

250

05:00:29

Very simple audio amplifier.
3V
8Ohm
Input audio-jack

published 10 years ago

njkirchne

10 years ago

The unit didn't perform as expected as it isn't biased properly for common operation

darrhunt

10 years ago

Linearity?

Karsten

10 years ago

No proper biasing, horrible distortion

andrypilot

10 years ago

I use bd139 transistor

andrypilot

10 years ago

The sound is very good

andrypilot

10 years ago

Actually there is no distortion

njkirchne

10 years ago

Your example shows no amplification. Where should we look

andrypilot

10 years ago

you build the amplifier and see that it works

TheKuli

10 years ago

Junk... :(

Karsten

10 years ago

If there would be no distortion, the output waveform would look like a sine wave, but it doesn't!

andrypilot

10 years ago

Why doesn't 3.3k resistance take half open the transistor?

andrypilot

10 years ago

3.3k resistance eliminates distortion, but the app doesn't work correctly.

Karsten

10 years ago

Have you "drawn" the output waveform with an oscilloscope?

andrypilot

10 years ago

I don't have an oscilloscope, I'd like to have it! :'(

andrypilot

10 years ago

Have you got an oscilloscpe?

hurz

10 years ago

http://everycircuit.com/circuit/4920666751500288

jpoulin0901

10 years ago

Simple amplifier.. or ample simplifier? I got nothing.

hurz

10 years ago

Its at least beside high distortion a good way to kill loudspeaker, and if not immediate kill then weaken over long the permanent magnet which get constantly a force into one direction

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