[sdiy] DIP LM13700 discontinuation

Benjamin Tremblay btremblay at me.com
Wed May 26 19:51:21 CEST 2021


So, it’s just a cream-of-the-crop bifet op amp. Nice. For me who does not even use tempco resistors or balanced outputs, probably too nice. It’s the pearl and I am the swine.

Benjamin Tremblay

> On May 26, 2021, at 1:46 PM, cheater cheater <cheater00social at gmail.com> wrote:
> 
> On Wed, May 26, 2021 at 5:02 PM Mike Bryant <mbryant at futurehorizons.com> wrote:
>> 
>> The TL07x is just a selected TL08x, mostly for gain, which translates to better offset voltage and sometimes slightly better noise.
>> Can you measure the difference ?  Just about
>> Can you hear the difference ?   Except in a mic amp, probably no chance, and even then probably only with an AP to convince you the noise is 1dB more above the theoretical noise floor.  It's only when you get into something like a 40 channel mixer that all these noises start adding up to something annoying.
> 
> It can easily matter when doing stereo. 1dB of difference can shift
> the stereo field.
> It can easily matter in a thing that uses many op amps in series. Like
> a filter or a crossover.
> You don't need an AP unit to measure low noise. You can use a Levell
> TM3B, which goes real cheap, plus possibly a J-Can LNA (diy) if
> necessary.
> 
> The Levell TM3B has super low self noise and input capacitance and the
> right bandwidth for an audio meter.
> 
> J-Can: http://physicsopenlab.org/wp-content/uploads/2016/10/JCan-NV-article.pdf
> 
> 
>> -----Original Message-----
>> From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of Benjamin Tremblay via Synth-diy
>> Sent: 26 May 2021 15:48
>> To: Michael E Caloroso
>> Cc: synth-diy at synth-diy.org
>> Subject: Re: [sdiy] DIP LM13700 discontinuation
>> 
>> Okay, I will go off on a tangent in this near-dead thread.
>> 
>> When I was a kid, I could only get the TL08 series op amps at Radio Shack. I see you audio people like the TL07s better, so I went and bought a tube of TL071, TL072, and TL074.
>> But I’m still going through my stock of TL084s.
>> 
>> When would be a case where I pull the TL08 from its socket and replace it with a TL07? What am I getting?
>> 
>> Thanks,
>> 
>> Ben
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