[sdiy] Op amps (was Re: TI SN74LS624N, worth buying?)

[Harry Bissell]

otoh the 741 is built like a tank, has good drive capability, and does not suffer from
phase reversal when driven to the rails.  I'd still consider the 741 for a bulletproof
(if noisy) output driver.

I used to drive 8ohm headphones directly from a 741  :^)

H^) harry

----- Original Message -----
From: Tom Wiltshire <tom at electricdruid.net>
To: John Alex Hvidlykke <john at hvidlykke.dk>
Cc: 'synth DIY' <synth-diy at dropmix.xs4all.nl>
Sent: Sun, 13 Nov 2011 10:48:29 -0500 (EST)
Subject: [sdiy] Op amps (was Re:  TI SN74LS624N, worth buying?)

Hi John,

The 741 was the very first op-amp I ever learned about. There was a time when all the standard circuits in op-amp books used 741s. It's a pretty noisy little beasty and I wouldn't use it any longer, even if I do still have a soft spot for it.

The TL series are more modern but still pretty old. We'll be generous and say "classic". You'll find them inside any of a million synths and amps and such like from the last thirty years.
It was my understanding that the 08x were low DC offset, the 07x were low noise, and the 06x were low current. All basically the same chip, but optimised for difference characteristics. I never used the 081/082/084 much, but I used to use the TL064 in guitar pedals because it gave a much better battery life than the others.

HTH,
Tom

On 13 Nov 2011, at 14:19, 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?
> 
> Also the 082/084 come into consideration. Having a higher number, my guess
> would be "a little better than the 072/074". But as you can see, I do not
> know.
> Having several mixed op-amps lying around I am not as much worried by too
> low quality, but more if I by accident use a too good/expensive/rare
> component in a place where a regular one would do the nob quite as nicely.
> 
> Any links to op-amp comparisons?
> 
> Before being accused of hoarding components, my "story" is that I have had a
> (mostly dormant) interest in electronics since my childhood, but having
> taken up music again in my mature years, I have dusted off my collection
> again. 
> 
> In the meantime the collection of components has been magnified considerably
> by inheriting the collections of two other electronics hobbyists after their
> deaths. Thus I have now a fairly big stock of components with only little
> knowledge of their use and history.  Some of it may hopefully be turned into
> synthesizer modules in the future.
> 
> Cheers
> John
_______________________________________________
Synth-diy mailing list
Synth-diy at dropmix.xs4all.nl
http://dropmix.xs4all.nl/mailman/listinfo/synth-diy

-- 
Harry Bissell & Nora Abdullah 4eva