Dear Mel and others,
> I have a LM747 that might do the trick, use one half.
73 mal/g3kev
> Use a LM741 Op-Amp in place of the OP27.
Unggg. (Worried sounds!)
I think you want to use it at about 0.5MHz. According to the data sheets I
found, the 747 has a gain-bandwidth product of 1.5MHz, so at 0.5MHz it will
have a gain of 3 (or thereabouts - the GBPs won't be too exact). The 741 seems
to have a GBP of 1MHz, so at 0.5MHz it will have a gain of 2ish.
For your circuit to work well, you need the op-amp gain to be well above the
gain of the amplifier (or whatever) you are building with it. I didn't look at
the circuit diagram someone kindly pointed us to, but if (at a guess) it aims
for a gain of 10 then you need an op-amp with a gain of many times that - say
100 to be on the safe side. At 0.5MHz this suggests a GBP of some tens of MHz.
Mel - I think I have a couple of AD844 chips lying unwanted at work. If I
recall aright, they have a GBP of 60MHz. Would you like a couple? I could
easily drop them in the post if you want, if you send me a snail-mail address.
('Fraid I don't have an up-to-date callbook.) If you don't want to put your
postal address on the newslist, my email is [email protected] .
73,
Chris G4OKW
-----------------------------
Dr Chris Trayner
School of Electronic & Electrical Engineering,
The University of Leeds,
Leeds LS2 9JT, United Kingdom
Tel: +44 113 34 32053
Fax: +44 113 34 32032
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