[sdiy] Re: 10 step sequencer

[Tim Parkhurst]

> -----Original Message-----
> From: Harry Bissell Jr [mailto:harrybissell at prodigy.net]
> Sent: Tuesday, October 14, 2003 2:42 PM
> To: Dave Krooshof; synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] Re: 10 step sequencer
> 
> I'd suggest using a binary counter, driving a 4051...
> (this is only eight steps...I don't remember if this
> was
> considered OK...)
> 
> You hook the incomming clock to the input of the
> 4051, the outputs will be high for the same period
> that
> the input clock is...
> 
> Two chips. Might use a 4520 counter and have 1/2
> a counter left over...
> 
> H^) harry
> 

That's a GREAT idea. The 4051 is an analog multiplexer. Rather than using an
AND gate to make the output pulse the same width as the input, you simply
re-use the input pulse and switch it to the different outputs. There is a 16
out analog MUX available too (4067). Since you're switching a logic level
signal, you can still use the output of the MUX to reset the counter (to
limit the sequence length). 

Two points for Harry!


Tim Servo



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