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funkyfarm

Joined: Jan 21, 2007 Posts: 583 Location: France
Audio files: 3
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Posted: Sun May 25, 2008 6:06 am Post subject:
External START/STOP Subject description: for module with CLOCK input and RESET input |
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Do you know a simple way to patch, add a START/STOP function to a clock divider or step sequencer, or any module with CLOCK and RESET inputs ?
routing master clock to a vca (initial gain set to zero)
firing this vca with a gate
using this same gate signal, shorten to trigger, as a reset ?
or an EOC trig ?
http://www.electro-music.com/forum/viewtopic.php?highlight=eoc&t=18454
thank you. |
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ryktnk

Joined: Apr 24, 2008 Posts: 285 Location: london
Audio files: 1
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Posted: Sun May 25, 2008 11:19 am Post subject:
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Hello
If you want to control the Clock signal, IE to turn it off
and on with a push switch then:-
You use a flip-flop [like a 4013], with a pulse
high switch in for Start/Stop, then connect the output
of the flip-flop to a 2 input AND gate [like 4081], with the CLOCK SOURCE
going into the 2nd input of the AND gate.
The output of the AND gate then connected to the Clock in
on your module/counter thing.
| Code: |
-------
ST/STP ---!CK !
! ! -------
! Q!-----------------------------! !
----!D _! ! !-------- TO CLOCK IN
! ! Q!---! --------! !
! !_____! ! ! -------
!_____________! ! 1/4 4081
1/2 4013 CLOCK SOURCE
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Hopefully should work !
Make sure the 4013/4081 are powered from GRND and +15
to get high enough signal for the Clock input.
Also use some 0.1uf caps on the power supply around these
chips to reduce the noise created by them.
Make sure unsed pins are connected to GRND.
The ST/STP switch might need a debounce circuit if
it is a cheap one, check out MFOS 16 step seq for a nice
one of these.
-ryktnk |
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funkyfarm

Joined: Jan 21, 2007 Posts: 583 Location: France
Audio files: 3
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Posted: Mon Jun 02, 2008 10:52 am Post subject:
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Thank you !
what a cool little circuit.
| Quote: | You use a flip-flop [like a 4013], with a pulse
high switch in for Start/Stop, then connect the output
of the flip-flop to a 2 input AND gate [like 4081] |
This "pulse" can be used to reset the sequence at the same time (when START goes ON) ? |
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etaoin

Joined: Jun 30, 2005 Posts: 761 Location: Utrecht, NL
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Posted: Mon Jun 02, 2008 12:17 pm Post subject:
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| ryktnk wrote: |
Make sure unsed pins are connected to GRND.
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Unused inputs only of course. Don't want to connect outputs that might be high to ground... _________________ http://www.casia.org/modular/ |
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funkyfarm

Joined: Jan 21, 2007 Posts: 583 Location: France
Audio files: 3
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Posted: Sun Jun 29, 2008 5:09 pm Post subject:
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for sure, IC outputs never go to ground.
i've once understood (here) that the famous 1k output resistor protects final buffer IC output of a module when inserting a jack plug. (among other things) |
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