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Scott Dorsey Scott Dorsey is offline
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Default [OT] Adding volume control to electronic device

In article , Tobiah wrote:
I acquired an electronic dart board. It barks out
information about each shot in a loud voice that
would bother other people in the house. There doesn't
seem to be a way to control the volume. I was wondering
whether I could just put a potentiometer in there to
get a volume control. I was thinking the signal could
go through pin one and two, with the third attached to
the other side of the speaker. Would that be the
correct way to do it?


Yes. You can do this with a 1/4 watt 50 ohm wirewound pot and it will be
just fine.

Some people will tell you that you shouldn't do this because the speaker will
see a higher impedance and consequently the frequently response will be
affected. That's true, and even worse the low end will likely drop off faster
as you turn the volume down, which is the exact opposite of what you'd want
since your ears do the same thing.

These people would tell you that the smart thing to do would be to intercept
the audio before it gets to the final amplifier stage so you can put a pot
on the input to the amplifier. They would be right; this is a much more
elegant solution.

But hell, this is a dart board, this is not hi-fi stuff. Use a 50 ohm pot.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."