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External START/STOP
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funkyfarm



Joined: Jan 21, 2007
Posts: 583
Location: France
Audio files: 3

PostPosted: 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
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PostPosted: Sun May 25, 2008 11:19 am    Post subject: Reply with quote  Mark this post and the followings unread

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



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
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PostPosted: Mon Jun 02, 2008 10:52 am    Post subject: Reply with quote  Mark this post and the followings unread

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

PostPosted: Mon Jun 02, 2008 12:17 pm    Post subject: Reply with quote  Mark this post and the followings unread

ryktnk wrote:

Make sure unsed pins are connected to GRND.


Unused inputs only of course. Don't want to connect outputs that might be high to ground...

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funkyfarm



Joined: Jan 21, 2007
Posts: 583
Location: France
Audio files: 3

PostPosted: Sun Jun 29, 2008 5:09 pm    Post subject: Reply with quote  Mark this post and the followings unread

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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