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ZL4AJS > TECH 28.11.05 02:40l 25 Lines 739 Bytes #999 (0) @ WW
BID : F00299ZL4AJS
Read: GUEST DL1LCA OE7FMI
Subj: Re: Frustrating Opamp
Path: DB0FHN<DB0FOR<DB0SIF<DB0CWS<DB0ZDF<DB0LJ<DB0RES<ON0AR<ZL2BAU<ZL4GQ
Sent: 051122/2151Z @:ZL4GQ.#95.NZL.OC #:37852 [Invercargill] FBB7.00i
From: ZL4AJS@ZL4GQ.#95.NZL.OC
To : TECH@WW
M1BYT wrote:-
> That is a relatively tiny voltage and possibly subject to interference
> from local mains hum pickup.
A good point. I don't think my circuit is capable of tripping on and off
50 times per second, but if I do run into trouble with a rough sensor
voltage, an RC filter will cure it.
And the trouble with the comparing was due to the 741 not being suitable
for such low voltages. An LM358 does the job now and it works fine.
Thanks for the advice,
73.
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:: Andrew ZL4AJS@ZL4GQ.#95.NZL.OC ::
:: Ohai, Southland, NZ ::
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Timed 07:36 on 23-Nov-2004
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