[sdiy] arp submodule question ..5400601F ?

[Bob Weigel]

Thanks for the insight Eric.  I rechecked things and was in error.  
THere is a ground ref 1K on that one also.  So they must have kept the 
4034's input 1K resistors to ground on this rendition of the 4035 then, 
rather than the 3.3K ones shown in the diagram.  They are also precision 
resistors but that's of no consequence in that location obviously.  
Probably just had a lot of stock on hand :-) Thanks again, -bob

Eric van Baaren wrote:

>Hi Bob
>
>I have  two different 4034 and a 4035 in front of me and the differences are
>like you described except for the 1k resistor which isn't there.
>
>
>4035-004REV1 never potted - dual fet 2n3958 - tantalums on powerinput
>4034-003 REV-A  potted -two fets 2n5459 on the opposite side - metalcan
>lm301AH on the opposite side - tempco on opposite side - ceramic caps on
>powerinput
>the other 4034-003 REV-A   potted - 2n3958 - lm301AN opposite side - the
>rest looks the same
>
>Best,
>
>Eric van Baaren.
>_________________
>http://www.sainteric.eu
>
>
>
>
>-----Oorspronkelijk bericht-----
>Van: synth-diy-bounces at dropmix.xs4all.nl
>[mailto:synth-diy-bounces at dropmix.xs4all.nl]Namens Bob Weigel
>Verzonden: maandag 2 april 2007 7:42
>Aan: synthdiy
>Onderwerp: [sdiy] arp submodule question ..5400601F ?
>
>
>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
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