pwm instead of pot

Forum 2005-2010 (read only) Hardware Interfacing
1

Hi,
is it possible to replace a potentiometre controlling the sound volume of a device by pwm ?

2

a transistor is what you're looking for.

what's the source of the sound you want to control?

3

it's actually a fm receiver kit I just got it has two potentiometers one fotr tuning and one for volume I was thinking on mabye being able to control it from arduino.

4

have you looked into digital pots?...

isaac

5

it's actually a fm receiver kit I just got it has two potentiometers one fotr tuning and one for volume I was thinking on mabye being able to control it from arduino.

if so you should try the digital potentiometers as idover proposed.

6

i believe that the volume control can be a pot, either analog or digital... but i'm pretty sure the tuner isn't as simple... though, i've never built a radio myself, only read about it online...

thanks,
isaac

7

http://www.users.bigpond.com/cool386/tda7000/tda7000.html

If you could find something that uses this it only takes two switches to do tuning.
http://www.glotov.pp.ru/filebase/docs/TDA7088T.PDF

If it's capacitor tuned you'd have to use a stepper. :wink:

Or if it's a TDA7000 you can set it up to be tuned with a pot.

http://www.nxp.com/acrobat_download/applicationnotes/AN192.pdf