Re: [CAD_CAM_EDM_DRO] small amp recommendation needed

On 6/13/01 1:45 PM, "Jon Elson" <elson@...> wrote:

> Chris Stratton wrote:
>
>> One of my co-workers needs a little amp to drive a DC brush servo
>> motor (open loop) at up to about 2-3 amps, 30 volts or so. It needs to
>> be moderately linear as he needs a sinusoidally varying velocity from
>> the motor. (ie, he wants the shaft to osciallate)
>>
>> My gut feeling is that this is power op-amp territory, but we need to
>> find something like an off-the-shelf module, as he simply doesn't have
>> time to play with all the power-electronics gremlins like the ones I'm
>> chasing in my prototype H bridge PWM/chopper.
>>
>> So far he's been using audio PA-system amplifiers, but keeps blowing
>> the chips - the conclusion is that something designed and protected
>> for motor drive use is needed.
>>
>> Any recommendations?

He is right on the edge of a LM12. Essentially a power differential amp made
for audio use. 25 v. 10 A. At least if you let the magic smoke out you have
not lost too much. I have some here that I never got around to using.
Contact me off list if you are interested.

Note: it does need _/- supplies which is a downer.

dengvall@...

Dave