[sdiy] CMOS chip questions

[Scott Nordlund]

I'd use it to drive a tape.  Monophonic mellotron?  MIDI-controlled tape delay?  Or just put inductive pickups near the motor?  I don't know, it would be kind of neat though- I'd guess a stepper motor would be a better way to get accurate pitch/speed than an ordinary DC motor with some sort of speed sensor control system, provided the "stepping" action is smoothed out enough to not give a distorted output.

----------------------------------------
> Date: Sun, 19 Jul 2009 11:13:16 -0700
> From: music.maker at gte.net
> To: synth-diy at dropmix.xs4all.nl
> Subject: RE: [sdiy] CMOS chip questions
>
> "David G. Dixon"  wrote:
>>> Why Would one need any TTL interfacing? Just tell me what's missing on
>>> CMOS replacements for TTL chips. It's probably 7404?
>>
>>Samppa's definitely got a point. Mixing TTL and CMOS is kinda like putting
>>'74 Chevy Impala parts in your Acura TL.
>
> There are times when one needs more drive current than CMOS provides. One way to deal
> with that is parallel drivers, but another is bipolar TTL. I guess it depends on
> exactly how much current one needs. I think, however, that for most synthesizer
> designs, such currents are more rare than common. Stepper motors? But who puts a
> stepper motor in a synth?
>
> Maybe some exotic thing that uses electromechanical vibrating parts excited by a synth
> circuit? (reaching)
>
> -- ScottG (who waits to find out about stepper motors in synths)
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