[sdiy] arp submodule question ..5400601F ?

[Bob Weigel]

I get no hits related on that number.  That's the only one on these 
boards.  I had thought they were 4034 or 5's.  On closer examination 
though....

1) I have a 4034 here.  It's absolutely NOT the same.  The design of the 
board is totally different.  Op amp on opposite end etc.  The rev. A I 
have has discrete FET's.  These have a dual FET in a can.  But ALSO the 
schematic deviates.  There is no 1K resistor attached to one of the 
input sides but there is on the other. (Pin 12 on the Z2 3086).  So I 
just wondered before I probe my life away if anyone has a clue what 
these things are from.  I got half a dozen or so in Tim Smith's stuff.  
The first one oscillates at some high requency.  Wasn't the output op amp. 

But anyway..these are obviously later models because there is no sign 
they were potted ever.  The 4072 and 75 use the LM3900 with transistor 
pairs.  Rather than 4 3086's.  So I'm not finding a match in any of the 
diagrams I can find on the arp submodules page exactly. -Bob