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Re: Audio distortion/overload

 

Try this simple solution!

Issue is, the collector of Q16 is at too high a voltage to handle a strong signal.

Either or 2 ways -

Change R114 to 220K or 180K the signal handling of Q16 will be larger, audio will be a little more mellow.

or

Change R112 to 10 or 12K it will do the same thing.

Ideally the collector voltage should be at half of Emitter to Supply voltage for maximum output ie volume.

The amp and speaker are innocent :-))

Raj

At 16/08/2017, you wrote:

Hi,
I have built two bitx40's and both appear to suffer audio distortion/overload, the audio sounds as though the speaker is "shot" I have tried three or four different speakers (all 8 ohm 3W) and on all of them I am unable to turn the volume up two much without getting distortion, it sound as though the output is too bassy for the speakers. I have done the rf gain control mod and this helps a little but the output is quite low. any ideas.

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