I tried this tonight, with a 320 in the audible range to my 700, no
other inputs connected. I could not hear any bleedthrough, even when I
took my 490 filter down to minimum frequency, giving silence. I'm
guessing your problem was from one of two causes:
1) You are overtaxing your power supply.
2) You power wiring setup is exacerbating the problem.
John Loffink
jloffink@... The Microtonal Synthesis Web Site
http://www.microtonal-synthesis.com/The Wavemakers Modular and Integrated Synthesizer Web Site
http://www.wavemakers-synth.com/ >
> My MOTM-700 was working fine except that it was effecting other
> modules through the power supply.
>
> It caused an audible glitch in other modules. This happened whenever
a
> router
> switched from one state to the other. This happened even if the 700
> was only connected by its power connector. The problem was easily
> heard by using a 320 in the audible range. Both routers within the
700
> were
> identical in effect, and the problem seemed twice as bad when both
> routers switched at the same time.
>
> Has anyone reported this or a similar problem?? One could easily be
> fooled into thinking that a noise heard when switching audio is
> caused by the VCA circuitry. My guess is that there is a transient
> from the LED's (perhaps both LED's are lit briefly exceeding the
> capacity of either the 12V or 5V regulator).
>
> C1 is a capacitor going to ground between the 5V regulator and LED's.
> The one from my kit was a 10uF 50V cap. I didn't have any 50V caps
> that would fit, and the schematic shows a 10uF 25V. So in order to
> provide more local storage, I put in in a 47uF 25V cap. The problem
> went away, but after a couple of minutes the 700 started behaving
> erratically, and then stopped working altogether. The cap burned
> out. It's now a perfect DC conductor sitting in my trash bin.
>
> So I put in a 47uF 35V cap. I had it running all night, and it is
> still working fine. No more PS glitch.
>
> I still have no idea how 5 volts destroyed a 25V cap.
>
>
>