[sdiy] op amps [was: Re: TI SN74LS624N, worth buying?]

[Harry Bissell]

imho it happens far too often :^)

In some cases the problem might be with the TL07x's propensity to oscillate with
any capacitive load at the output, usually cured with a small series resistor at the output (maybe 10-100 ohms)

I like the 4558 as a good, low noise, not too fast sub for the 741 (of course its a dual, but...)

H^) harry


----- Original Message -----
From: Aaron Lanterman <lanterma at ece.gatech.edu>
To: synth diy <synth-diy at dropmix.xs4all.nl>
Sent: Sun, 13 Nov 2011 13:33:06 -0500 (EST)
Subject: [sdiy] op amps [was: Re:  TI SN74LS624N, worth buying?]

> On 11/13/2011 03:19 PM, John Alex Hvidlykke wrote:
>> Op-amps are the workhorses of audio electronics, but they come in a
>> confusing lot of versions. That the 072 and 074 are almost omnipresent I am
>> aware of. But how good are they, compared to other "standard" op-amps? In my
>> box of amps I have several 741's and 1741's, which, as far as I am concerned
>> must be the lowest in the range. Do the 07x compare to them, or are they
>> much better/faster?

One bit of warning - don't necessarily always assume you can replace a 741 (or similar cruddy op amp by modern standards (with a better one). One or two of my students have come across cases where the slow slew of the 741 helped prevent parasitic oscillations - a TL07x in the same spot in the circuit would yield these crazy ultrasonic oscillations that sticking in capacitors wouldn't tame. (This doesn't seem to happen too often, though.)

- Aaron
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-- 
Harry Bissell & Nora Abdullah 4eva