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 Forum index » DIY Hardware and Software » Developers' Corner
Drum Module Triggering ?
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tasteless



Joined: Feb 18, 2013
Posts: 4
Location: Australia

PostPosted: Mon Feb 18, 2013 4:31 pm    Post subject: Drum Module Triggering ?
Subject description: From Drum Machine Aux outputs
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Hey , New guy here.

Great forum !

I've been devouring all of the information in WhaHoah's recent thread on simple analogue drum ccts As , I've always wanted to build a little module using similar elements.( 808,606,Mini Space Rockers etc..).

So I was wondering how I could go about triggering these sounds from the Auxillary outputs of a Drum Machine ?

I've got an old ETI percussion synth that will trigger well using any short , sharp ,fast-transient sound ( ie- cowbell , rimshot etc..) But , I havent been able to find a cct diagram for it , to see how it works.

I guess what I'm looking for is some sort of Audio to CV trigger ?

Any advice - Extremely welcome.

Cheers.
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-minus-



Joined: Oct 26, 2008
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PostPosted: Mon Feb 18, 2013 6:03 pm    Post subject: Reply with quote  Mark this post and the followings unread

welcome

I've built several of these onto stripboard. They are a simple circuit which works well. Will turn a gate into a trigger if that is what you are after.

http://www.cgs.synth.net/modules/cgs24_gatetotrigger.html

EDIT: Actually, just reading through your post again, maybe this isn't what you are after. You are wanting to trigger using an audio signal? Confused
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analog_backlash



Joined: Sep 04, 2012
Posts: 387
Location: Aldershot, UK
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PostPosted: Mon Feb 18, 2013 6:26 pm    Post subject: Reply with quote  Mark this post and the followings unread

Ditto on the welcome.

I was a bit confused by this. I think that you want the audio output of your drum machine to trigger external circuits. If so, a modification of the MFOS circuit shown here, might work:

http://www.musicfromouterspace.com/forums.html?MAINTAB=SYNTHDIY&PROJARG=SOUNDLABMINISYNTH/drumtrigger/drumtrigger.html&VPW=1356&VPH=551

If you had a buffered audio signal going to D1/D2 (after removing the piezo, amp U1-A and associated components), it should produce a trigger signal at R9. I'm not sure if you actually need any CV signals, but I may be totally misunderstanding your request. You might also require it to work at a different voltage or from a single rail supply, which might mean some re-designing.

Anyway, they're my initial thoughts.

Gary
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tasteless



Joined: Feb 18, 2013
Posts: 4
Location: Australia

PostPosted: Mon Feb 18, 2013 11:54 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks Guys - Great info in both posts.

The second half of both ccts is on target.

The MFOS cct , May work as is - Because essentially that is what I have happening with My ETI Percussion Synth ( Which I would assume - was intended to be driven by Piezo elements ).
I just plugged a Drum Machine into it out of curiosity one day And , It worked !

I sort of envisioned a cct ( While I was in the shower ) that involves a buffer and envelope detector.
Which I shall attempt to explain - as soon as I've gotten My head around it.
Perhaps I should take longer showers.
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