previous by date | index | next by date |
topic list | next in topic |
> 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.
>
>
>
> ------------------------------------------------------------------------
> Click here to win tickets to the concert of your choice!
> http://click.egroups.com/1/6694/6/_/529958/_/963797533/
> ------------------------------------------------------------------------
>
>