[sdiy] DIP LM13700 discontinuation

[David G Dixon]

I have put the odd 5532 in as the final output amp on some VCAs.  However, I
have neither the skill nor the equipment to measure whether they are
demonstrably better.  Like probably 99% of DIY electronics guys, I just went
by what I read in Douglas Self's book about it.



-----Original Message-----
From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of Mike
Bryant
Sent: Friday, May 28, 2021 3:15 AM
To: Neil Johnson
Cc: synth-diy at synth-diy.org
Subject: Re: [sdiy] DIP LM13700 discontinuation

[CAUTION: Non-UBC Email]

And 5532s for the output amps.  TL072s aren't so good there.

I've been asked why we don't just use 5532s everywhere.  Simple - the mixer
would be so hot you'd need several extra fans which rather messes up the
signal to noise ratio for the guy doing the mixing.  
And in fact for the mic amp the distortion is slightly worse than with a
TL072 as it loads the input pair more.


-----Original Message-----
From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of Neil
Johnson via Synth-diy
Sent: 28 May 2021 10:37
To: Synth-diy
Subject: Re: [sdiy] DIP LM13700 discontinuation

For what they cost they're pretty good opamps, and suitable for many
applications.  Sure, they're not the lowest noise, or distortion, or offset,
or drift, or power consumption, but they are incredibly cheap (but not too
cheap!).  For general use they're hard to beat.

Typical mixing desk these days is TL072 for all but high-gain blocks, where
it's either transistors as the gain elements (mic pre) or 5532 or 5534 for
the sum amps.

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