MOTM

I built two MOTM/OMS-820 modules also.  Mine are in 2U wide Schaeffer 
panels I designed.  I simply omitted the bypass function on the MOTM and 
the pushbuttons on the OMS to compact everything into 2U.  I also added 
another comparator to detect "near zero" output, that generates an 
end-of-cycle pulse.  Patching this to the GATE input gives a new 
oscillation mode:  0 to +5V, which resembles in function the famed Serge 
Dual Universal Slope Generator.

Got a question for you MOTM/OMS 820 owners.  Have you ever noticed an 
irregularity in the period of the oscillation?  I see this in both LFO 
modes (the OMS original, plus the mode I added).   When the period is on 
the order of a few seconds per cycle, there will occasionally be a short 
cycle, a period slightly shorter.  It seems to happen randomly, every 5 
to 10 cycles.  I don't know for sure if this happens across the entire 
frequency range, but it's most noticable as described.  I have read 
through the theory of operation on the MOTM-820 and studied the 
schematic.  I don't completely understand the relationship between the 
control voltages and the slew rate.  The OMS-820 puts the MOTM-820 to 
wonderful, unintended uses!  I like it very much, even including the 
period anomaly, which has musically interesting applications -- another 
"source of uncertainty."  I have plenty of dependable MOTM LFOs when I 
want a rock-solid period.

-Richard Brewster

P.S. -- Scott, your "self running" patches need to be kick started?!  :-)

Scott Juskiw wrote:

>>I've just added the now-discontinued Oakley OMS-820 companion module
>>to my MOTM-820 lag processor.  If you've got the MOTM-820, you will
>>LOVE the extra functions the OMS-820 adds- VCLFO and VCEG.  Tell Tony
>>to reintroduce this module and sell you one!
>>    
>>
>
>I agree. I have two MOTM-820/OMS-820 combos and they get used in 
>every patch. I was surprised when Tony said the OMS-820 wasn't 
>selling well.
>
>BTW, it's also good for manually generating a gate signal (for those 
>self running patches that need a boot to the head to start up).
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