[sdiy] OTA question

[Harry Bissell]

WHAT ??? are you saying that the circuit did not work on a perfboard, but WORKED
on a SBB.  

Maybe your circuit needs a bunch of stray parasitic elements coupling God-knows-what
and intermittent connections everywhere to work...

seriously, was it a copper clad perfboard ?  Sometimes there are faults in copper-clad
where there are subterranian short circuits (contamination in the laminate that can
join unknown circuit points).

I have seen this ~once~ ... a metal whisker in the fiberglass that shorted out two
adjacent points.  It was unbelievably hard to find as it was invisible. I dug halfway
through the PCB to break the connection...

H^) harry

----- Original Message -----
From: Ian Fritz <ijfritz at comcast.net>
To: synth-diy <synth-diy at dropmix.xs4all.nl>
Sent: Thu, 16 Sep 2010 22:12:41 -0400 (EDT)
Subject: Re: [sdiy] OTA question

For anyone who is still holding their breath over this cliffhanger ... I 
rebuilt the circuit on an SBB and it works fine.  No iDea what was wrong on 
the perfboard.  Bad transistor? <shrug>

  Ian

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-- 
Harry Bissell & Nora Abdullah 4eva