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From: piglet <erichpwagner@hotmail.com>
Newsgroups: sci.electronics.design
Subject: Re: Op-amp mystery
Date: Thu, 12 Sep 2024 14:34:15 -0000 (UTC)
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Liz Tuddenham <liz@poppyrecords.invalid.invalid> wrote:
> john larkin <jlarkin_highland_tech> wrote:
> 
>> On Tue, 10 Sep 2024 10:31:37 +0100, liz@poppyrecords.invalid.invalid
>> (Liz Tuddenham) wrote:
>> 
>>> It's always the stupid things that cause the most trouble:
>>> 
>>> I was working on a fairly straightforward experimental audio circuit
>>> using TL074 op-amps laid out on Veroboard, which is prone to inter-track
>>> shorts unless you are very careful with your soldering.   The gain of a
>>> virtual-earth stage was too high, so I altered some resistor values to
>>> cut it down.  
>> 
>> Show us a pic of your breadboard!
> 
> I've posted circuit diagrams and a picture at:
> 
> http://www.poppyrecords.co.uk/other/Turntables/parallel-tracker.htm
> 
> It was the headphone amplifier that caused the mystery.  So simple, yet
> so confusing when you aren't expecting simple things to go wrong.
> 
> 

Thanks, interesting headphones volume setting.


-- 
piglet