[sdiy] IN your mind, what is .... LM3900

[mark verbos]

It was used in the Buchla 208. Since it's powered from GND and +15 it's 
nice for interfacing with CMOS.

It's used in not just the wave multiplier, but almost all Serge modules. 
As a flip-flop in the DSG, and as a comparator all over the place. One 
advantage of using it as a comparator is that it only takes one resistor 
to program the threshold. There must be something else. It's cheap?


Mark




Scott Gravenhorst wrote:

>Dare I bring this back to actual synth-DIY?  
>
>I had asked if anyone could describe what it is that the LM3900 was the
>best choice for in analog synth design.  Paul Perry answered that the Serge
>Wave Multiplier uses it, but other than that, there were no other
>responses.  I'm assuming now that it isn't all that useful for analog synth
>work other than the SWM module (which looks fun and simple).  This is
>probably because it's a current input device, and apparently, there isn't
>much need for a current differencing amplifier in analog synth electronics.
> My poorly wired cerebrum doesn't seem to pop out anything über-wonderful.
>
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