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 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
One shot (or quick) trigger for Lunetta?
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Vanwonky



Joined: Jul 24, 2013
Posts: 21
Location: Perth, Australia

PostPosted: Thu Aug 07, 2014 12:55 am    Post subject: One shot (or quick) trigger for Lunetta?
Subject description: Making a long pulse short.
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Howdy All,

I am looking for a way to trigger an event for a short period but using a long pulse. For example my using my LFO to gate something else but the LFO remains high for 30 second whilst the thing I am gating goes low after literally a split second and of course gets triggered again after 30 seconds. That makes perfect sense to me Confused . Any such (simple) circuit out there?

Cheers
Dave
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rumblin_cynth_rampo



Joined: Nov 15, 2012
Posts: 33
Location: Cardiff, Caerdydd, UK

PostPosted: Thu Aug 07, 2014 2:47 am    Post subject: Reply with quote  Mark this post and the followings unread

You might find the one shot down the MFOS page a bit useful

http://www.musicfromouterspace.com/analogsynth_new/ELECTRONICS/mickeymouselogic.html

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Vanwonky



Joined: Jul 24, 2013
Posts: 21
Location: Perth, Australia

PostPosted: Thu Aug 07, 2014 6:41 am    Post subject: Reply with quote  Mark this post and the followings unread

Cheers. Will have a look.

rumblin_cynth_rampo wrote:
You might find the one shot down the MFOS page a bit useful

http://www.musicfromouterspace.com/analogsynth_new/ELECTRONICS/mickeymouselogic.html
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PHOBoS



Joined: Jan 14, 2010
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PostPosted: Thu Aug 07, 2014 7:24 am    Post subject: Reply with quote  Mark this post and the followings unread

depending on the circuit a capacitor in series could do the trick. But you might need one or two resistors
and maybe a transistor or logic gate as a buffer.

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Vanwonky



Joined: Jul 24, 2013
Posts: 21
Location: Perth, Australia

PostPosted: Thu Aug 07, 2014 7:57 am    Post subject: Reply with quote  Mark this post and the followings unread

Just tried the One Shot from MFOS - perfect - exactly what I wanted. Vary the capacitor as needed and swap a 100K pot for the resistor and I can vary the length of the 'shot'. Invert the signal using the next inverter on the 40106 I used. Awesome!
Thanks for the replies - much appreciated.
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