At 09:17 PM 1/4/2004 +0200, you wrote:
> >"Peter L. Peres" writes:
> >>You cannot use a pullup, you have to use a pulldown (1k should work). Do
> >>get the LM324 data sheet if you do not have it.
>
>Sorry for being cryptic. The LM324 will not pull the output down to GND
>(it cannot sink current when this happens). Therefore a hysteresis
>positive feedback resistor cannot be used when the input is only 65mV
>unless a pulldown is used at the output of the LM324.

Really?

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

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