Archive of the former Yahoo!Groups mailing list: MOTM

It just occured to me (well, actually yesterday talking with MOTM user in
UK) that the 4,000
CEM3340s I have sitting here collecting dust could be quickly converted to a
newer version of
the Digisound VCDO.

This uses the CEM3340 VCO chip in "ultrasonic" mode (ie say 1Khz to 100Khz
range) to scan
out waveforms in an EPROM. It's pretty easy to have VC'd waveform selection,
etc etc a la the
Wiard 'Waveform City' (which uses a technique prone to jitter errors).

Also cute is Windoze applett to 'draw' waveforms and then create Intel hex
file to blow into EPROM
if you have access to a programmer (like the $129 Needhams one).

Anyway, just a thought. Comments?

We could get Old Crow to add a PIC to do VC'd morphing (just an ADD then a
SHIFT before DAC).
Or digital GAIN control (0 to +5 goes into ADC on the PIC, with a MULT to
gain scale. If you don't
plug a signal in, there is a 100K pullup to +5 rail into ADC to get
full-scale output).

Paul S.