[CART360] Need to Build a Six-Channel Audio Amplifier

[Craig Fahner]

Check out the LM386. Very simple, very cheap audio op amp:

http://en.wikipedia.org/wiki/LM386

On Sat, Dec 5, 2009 at 11:11 PM, Morgan Sutherland <skiptracer at gmail.com> wrote:
> Hello List, Vince, Elio, Joe,
> I need to build a low-noise 4-6-channel audio amplifier for three different
> actuators:
> 1. small 2"-or-so speakers [TBD]
> 2. "inertial" vibration motors (takes AC audio signal) [Joe, you can tell me
> about the power requirements for this]
> 3. "vibration speakers" (16mm) [max input: 0.5W, resistance: 6ohms]
> I'm wondering how I should go about shopping for amplifiers.
> I gather from the Wikipedia entry[1] that I need to match the resistance
> (usually 4-16 Ohms) and the max. input wattage. Should I find the specs for
> each specific actuator we're using and buy an amplifier chip for each? Can I
> use an overpowered amplifier and just ease it down with resistors? According
> to wikipedia, class A amplifier are inefficient (though audiophiles
> apparently swear by them). As I'm not using battery power, should I care
> about efficiency here, or use an AB amplifier (according to Wikipedia, a
> "good compromise")[2]?
> Any particular recommendations?
> 1. http://en.wikipedia.org/wiki/Electronic_amplifier
> 2. Turns out Digikey doesn't even sell class A amplifiers
> _______________________________________________
> CART360 mailing list
> CART360 at uttermatter.com
> http://uttermatter.com/mailman/listinfo/cart360_uttermatter.com
>
>