Re: How can I subtract one frequency from another ???


"Technician" <technician@xxxxxxx> wrote in message
news:VcaAf.293824$2k.59093@xxxxxxxxxxx
> Thanks,
> Which inputs do I use on the AD633, X1 and X2, or Y1 and Y2? (I will be
> inputting a left and right channel to be subtracted from one another)
> Also, can you recommend a schematic using an LM324 for the low pass
filter?
> I tried a couple right out of a textbook but they did not seem to roll off
> anything over the 50Hz I configured it for. (Meaning I want only
frequencies
> of below 50Hz to appear at the output)
> Thanks again!

Can't see most of this thread but suggest this 50Hz filter.
Has a fast roll off, with a nice notch at the 600Hz point, (where there be
lurking nasties)
The drawing needs viewing in a fixed space font, such as Courier
100n
||
.-----||-----o----------.
| || | |
| | |\| |
| '----|-\ |
___ ___ | ___ | >--o-o OUT
o -|___|---o---|___|---o---|___|----o----|+/
IN 100k | 100k 100k | |/| LM324
| || |
o-----------||-----------o
| || |
| 68p |
--- ---
--- 47n --- 10n
| |
GND GND


(created by AACircuit v1.28 beta 10/06/04 www.tech-chat.de)



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