| |
ZL4AJS > TECH 28.11.05 02:40l 32 Lines 1075 Bytes #999 (0) @ WW
BID : 750298ZL4AJS
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 #:37851 [Invercargill] FBB7.00i
From: ZL4AJS@ZL4GQ.#95.NZL.OC
To : TECH@WW
VK2ZRG wrote:-
> The reason why your op-amp circuit isn't doing what you expect is that a
> LM741 type op-amp doesn't properly work with input voltages that are too
> close to the supply rails.
> Some op-amps will work with input voltages very close to the supply
> rails; consult some data books Andrew, or look on the internet if you
> have access. One commonly available op-amp that would probably work in
> your circuit is a LM358.
Yep, that was the problem! I've replaced the 741 with a 358 and it now
works properly. Thanks for the advice!
> Looks like the exams are over...how did you go?
Umm...I don't actually sit the exams like the school kids since I'm
homeschooled, but in the exams I do sit, I don't do too bad. And the
school kids don't get their results until the end of January.
73.
:::::::::::::::::::::::::::::::::::::::::::
:: Andrew ZL4AJS@ZL4GQ.#95.NZL.OC ::
:: Ohai, Southland, NZ ::
:::::::::::::::::::::::::::::::::::::::::::
Timed 07:28 on 23-Nov-2004
Read previous mail | Read next mail
| |
