Archive of the former Yahoo!Groups mailing list: MOTM

Well, I had 3 "candidates" for the Mystery Module, and the winner
is...........

The VC Lag!

This is a JH/PS design using a simple 4 transistor "quasi-OTA" structure.
Here is a rundown
of the panel/controls so far. As always, inputs requested!

Jacks:

IN
OUT
BYPASS - a shorting of tip to sleeve bypasses the lag. Used for footswitch
control when
playing live from a keyboard.

UP TIME CV - increasing voltage increases the "Attack" portion
DOWN TIME CV - increasing CV increases the "Release" portion
UP & DOWN CV - moves both at once

Pots:

UP
DOWN
UP/DOWN - all 3 are initial controls or act as attenuators when a CV is
inserted
SHAPE - the glide shape is variable from linear to exponential.

There is 1 on-board offset trimmer (0 out for 0 in).

LED - is ON when BYPASSed (need to pick Red or Green)

Price: $125 kit $180 assembled/tested.

Simulation show linear times are 0-4 seconds and Exponential times are 0-10
seconds. Unfortunately,
it's almost impossible to make them equal.

The INPUT can be CV or audio. Low offset, low-drift op amps are used for use
with CVs running into VCOs.
Even though the circuit "looks simple" these op amps are $$$.

This is a 2U wide module. This will be fairly easy to build, a 3 out of 10.

+++++++++++++++++++++++++++++++

After reading all the comments on the bigger module, I am still leaning
towards 1U X 19". The main reason, as
several folks pointed out, is to increase market share. This would ∗not∗ be
a MOTM branded product. But
I think that it could wind up at places like Sweetwater and generate
revenue. The reason is that my
DSP consulting job is winding down, and I need some more $$$ to fund R&D for
next year (like the Sequencer!).

In about 10 days I'll have some sound samples..shound give Bob Moog concern!
<hint hint>.

Paul S.