big audio amplifier, and capacitive coupling, or use an lm-12 opamp,to
just do a 5A output mixer

On 6/4/07, Carey Fisher <careyfisher@ncsradio.com> wrote:
> I need to simulate alternator whine on a power supply so that I can
> design a whine filter. (No, I'm not gonna use it on the kids...)
> The specs are:  Power Supply is 12-14VDC and will supply about 1 A
> to the Unit Under Test (UUT).  I want to be able to superimpose a 800-2000
> Hz
> sine wave (and/or triangle, square, whatever) on the supply line at .5Vp-p
> to maybe
> 6Vp-p.  I have an audio sig gen but I tried capacitive coupling to the
> DC line and, of course, the input Z of the UUT is too low for good
> results.
> Anybody got any ideas on how to do this simply?
> Thanks,
> Carey
>
>
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