Sound great Paul. I do have one question. You said switches when the jack
is inserted into OUT 1. Intuitively, I would consider Out 1 the one to be
active when in 6 X 1 mode. If the switch in one output 1, then out 2 must
be the one active for 6 x 1 mode. Seems backwards. However, I do think the
DC bias needs to be active in the 6 x 1 mode.
In reference to the special jacks, I guess you just purchased the wrong ones
and need to move them. Right? You need normally closed, these are normally
open (so the isolated switch shorts when the jack is inserted?) If so, I
would be willing to take a large quantity off your hands at that price. How
many do you have?
Larry
----- Original Message -----
From: Paul Schreiber <synth1@...>
To: MOTM listserv <motm@yahoogroups.com>
Sent: Saturday, March 03, 2001 11:32 PM
Subject: [motm] Mixer design as of now
Here is what I'm about to commit to for the mixer unless someone else
convinces me elsewise:
∗ 2U wide
∗ dual 3:1 or single 6:1
∗ it splits into dual mode when a jack is inserted into OUT 1
∗ DC path. Can mix AC and/or DC. Uses OP285GP amps. This is a lower
offset/drift version of the OP275GP
∗ Has a -5V to +5V DC bias pot, which is switch in/out via panel switch.
Only offsets OUT 2.
∗ 2 reversing attenuators (1 in each mixer)
∗ NO 'master Gain' it takes a dual pot and I'm not going down that road
(like 18 weeks lead time).
∗ $169 kit/$229 assembled
∗easy to build, no trimmers. About as hard as a '420 kit.
Well?
Also: I have some new Switchcraft 113 jacks for sale. The are like the 112As
except:
∗ single open circuit (doesn't have the 3rd shorting lug)
∗ has an isoloated N.O (Normally Open) switch (on 2 seperate lugs)
The mixer needs a 113E version, which has a N.C. switch (grrrrrr.....)
Regular about $2.50ea. I'll sell em for 10 for $8.00 That's cheap! You don't
∗have∗ to use the switch :)
Paul S.
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