srm@dimacs.rutgers.edu (Scott R. Myers) (03/10/91)
I want to do a hardware hack on my speaker. Basically I want to add a
Potentiometer to adjust my volume. I don't know what resistence to
use. Can anyone help? Thanx in advance.
--
Scott R. Myers
Snail: 26 Stiles Street Phone:(908)352-4162
Apartment 18
Elizabeth, NJ 07208
Arpa: srm@dimacs.rutgers.edu Uucp: ..!dimacs!srm
"... No matter where you go, there you are ..."dwsmall@miavx1.acs.muohio.edu (03/14/91)
> I want to do a hardware hack on my speaker. Basically I want to add a > Potentiometer to adjust my volume. I don't know what resistence to > use. Can anyone help? Thanx in advance. > -- > > Scott R. Myers > > Arpa: srm@dimacs.rutgers.edu Uucp: ..!dimacs!srm Are you tring to lower the volume only? If so you can use anything that has a range that starts a 0 Ohms and goes up. Since the internal speaker has a nominal impeadence of about 2 Ohms, a 4 Ohms pot should reduce the power to your speaker by about 300% which would drop your volume to about one fourth of it's intial level. If you are looking at increasing the volume as well as decreasing it the only way you can do it with a dash pot is to put the dashpot on the inverting side of you amplifier chip (with the existing resitor in parallel). This would raise the gain of you amplifier. Be careful doing this though since if you try to overdrive your amplifier you could burn out you speaker or you amp. A better method might be to pick or an amplifier chip from radio shack. Use the output to you speaker as the input for the chip and then use the dash pot as you would if you were just trying to lower the volume only. I've been wanting to try this latter scheme for a little while but as of yet haven't found the time. If you get one working or have any questions let me know. I don't know how much you know about hooking this kind of thing up but it is really pretty easy so if you're not sure just ask. Good Luck Derek W. Small