For DC and LFO speed type waveforms, you can do these functions with an
existing 1U MOTM module - the pedal interface. DC / LFO signal input # 1 =
pedal jack with reversing attenuator +/- 5 on input. Separate input #2 is
DC / LFO input "MIX" with non-reversing attenuator. Built in bias control =
+/- 2.5 volts.
For the LFO triangle conversion below - tri LFO signal to pedal jack, adjust
attenuator to -2.5 to scale wave to 50% and invert. Adjust bias control to
+2.5 to bias to +5/0.
The drawback is the chip selection in the pedal interface is not AC audio
frequency friendly. You could build your pedal interface with TL072s
instead to make it more audio frequency friendly. Send me the spare 1013s.
:)
So, use # 43 for pedal interface = 2 input mixer with built in bias and one
of the input attenuators as reversing one non-inverting.
Larry Hendry.
P.S. Makes a good pedal interface too.
----- Original Message -----
From: Scott Juskiw <scott@...>
This is a good idea. I'd also like to see the inputs have +/- so that
we can both invert, scale, and bias in one go (in that order).
Something that comes up all too often, for me, is the need to invert
a triangle, then scale it from +5/-5 to +5/0.
> At 3:44 PM -0800 6/12/01, Thomas Hudson wrote:
>Another one would I would like to see and should be fairly cheap would
>be a single width module with a variable DC source and a one or two
>input DC mixer with bias:
>
>Pots: DC Out, In1 Level, In2 level, DC bias (-5/+5)
>Jacks: DC Out,In1, In2, Mix Out
>
>Actually to make it even cheaper version you could leave off the
>independent
>DC out, and drop a pot and jack. Of course I guess I've come full circle
>back to the mixer discussion (sorry Paul). I just find myself needing to
>bias a lot of waveforms lately.