[sdiy] The CD4516 has a hidden agenda.

[harry]

And it might be that multiple 555 timers are soft syncing due to the
horrible
power supply spikes on output switching... check your decoupling caps
(your LOTS of decoupling caps) or switch to 7555 (CMOS)

H^) harry

Sowa Roman wrote:

> Use transistor to block ProgramEnable input while Hold is applied.
> Base thru resistor to CarryIn input, collector to ProgramEnable,
> emmiter to ground. And insert a resistor between ProgramEnable
> and whatever output that was connected to it before.
>
> Or using gates...
> you really want me to tell the 'schematic'? ;)
>
> You might also change this 40kHz counter outputs, so that
> e.g. Q1 doesn't go to P1 of second counter, but for example
> to P3, etc. That may move it slightly from 'pseudo' to 'random'
> side.
>
> Roman
>
> ""-----Original Message-----
> ""From: Peter Grenader [mailto:petergrenader at mksound.com]
> ""Sent: Thursday, April 18, 2002 9:09 AM
> ""To: synth-diy at dropmix.xs4all.nl
> ""Subject: [sdiy] The CD4516 has a hidden agenda.
> ""
> ""
> ""Ah shuckins.  Seems I didn't give the truth table of the 4516
> ""a close enough
> ""look when I dreamt up this sequencer.  Carry In Prime, which
> ""serves as my
> ""Hold function has no effect if the 4516 is told to accept
> ""presets, which is
> ""the method I'm using to do the the random order sequencing.
> ""It holds just
> ""fine when it's running forward, backward or as a pendulum,
> ""but its TT is
> ""telling it not to stop when I'm in random.  Might be able to
> ""fix this with a
> ""little mechanical switching logic, might have to slap in a little more
> ""boolean.
> ""
> ""BTW, my random is too much on the pseudo side and not
> ""enoughon the random
> ""side.  I need to VC the frequency of the 555 i think which is
> ""generating the
> ""40kHz binary presets into the 4516 so it runs herky jerky and not free
> ""running.  this should significantly decrease the patterns
> ""that are forming
> ""every then and again now.
> ""
> ""You guys never said this stuff wouldn't work perfectly!  this
> ""is NOT FAIR.
> ""
> ""
> ""
> ""
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