On Wed, 16 Mar 2005 13:22:31 +0100, "Maxy888"
wrote:

Hello,

I would like to change the manual volume potentiometer of my integrated
amplifier with a motor-driven potentiometer which must be infrared
controlled.

My question is simple...

How do I do that?

I've already chosen the potentiometer, what do I need now? A servo control?
And what about the infrared control and reciever?

Do you have any idea about some newsgroup I colud ask in?

Thank You


You need a DC PM motor to turn the potentiometer. You need a gearing
mechanism to reduce the RPM, an a sip clutch (so the motor doesn't
brak the potentiometer at its limits, plus you can manually operate
the potentiometer.

The motor will be controlled by an H-bridge, which has two logic
lines, a CW and a CCW.

As for the remote, that is a little more open.

You can find/build a transmitter/receiver set that provides the logic
to provide the signals you need (can't recommend one though, at least
one in production).

You can use an existing remote (or chip, or code in a universal
remote), and build a microcontroller based decoder for it (takes
software skills).

When I built my A/V switcher, I chose the former, as the logic with a
decoder chip was easier for me than the software code would be.
I salvaged the decoder chip from some obsolete gear, and "emulated"
the original remote in a programmable universal remote (One ForAll URC
6011/6017).


You should ask in the sci.electronics.design group.