Re: Op-amp mystery

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.