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Forum Index : Microcontroller and PC projects : PicoMite: driving a small speaker

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Volhout
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Joined: 05/03/2018
Location: Netherlands
Posts: 3761
Posted: 03:10pm 03 Jun 2023
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The amplifier is a differential amplifier. So it amplifies the difference between A and A-.
In case of mono, you hear theretically nothing. Small differences between A and A- are amplfied. In case you have mono with counterfase signals, this results in a ver good loud audio.
When A and A- are stereo, your loudspeaker will give the difference betwwe L and R.

Volhout
PicomiteVGA PETSCII ROBOTS
 
thwill

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Joined: 16/09/2019
Location: United Kingdom
Posts: 3907
Posted: 03:39pm 03 Jun 2023
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Thanks Volhout, this is what I thought, but doesn't match the observation that when fed a stereo signal with the same signal on L/AIN+ and R/AIN- I am getting a reasonable output. I guess I need to check my wiring.

Best wishes,

Tom
Game*Mite, CMM2 Welcome Tape, Creaky old text adventures
 
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