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 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
piezo drum trigger
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battleass



Joined: Mar 22, 2011
Posts: 4
Location: portland

PostPosted: Tue Mar 22, 2011 11:45 pm    Post subject: piezo drum trigger
Subject description: I'm looking into building a drum trigger to go with a lunetta-esque system
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I know that this schematic isn't exactly lunetta but I would still like to use it, and was wondering what changes would need to be made in order to make it work with a ground/+9 power supply instead of a -9/+9 power supply.
any other schematics that you believe would work better would be greatly appreciated.


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richardc64



Joined: Jun 01, 2006
Posts: 611
Location: NYC
Audio files: 25

PostPosted: Wed Mar 23, 2011 3:09 am    Post subject: Reply with quote  Mark this post and the followings unread

Use an LM324. Change U1-A to the circuit shown below. A piezo doesn't need anything near a 30M load. Adjust the 330k for more or less gain, if needed. Make R5 a pot and 1k-10k resistor for variable decay. The rest of the MFOS circuit will work with a single-supply 9V LM324.

If all you need are triggers, and already have some other way to generate envelopes, all you need is the front end. Get 4 of them from one '324.


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battleass



Joined: Mar 22, 2011
Posts: 4
Location: portland

PostPosted: Wed Mar 23, 2011 6:41 am    Post subject: Reply with quote  Mark this post and the followings unread

so would I be able to run the front end schematic straight into this schematic and be able to have a piezo triggerable envelope generator?

and would I be able to use the LM324 ic for the op amps on the ar generator?

one last question is the external trigger in the front end schematic not neccessary for what I am wanting to do with it?


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richardc64



Joined: Jun 01, 2006
Posts: 611
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PostPosted: Wed Mar 23, 2011 7:29 am    Post subject: Reply with quote  Mark this post and the followings unread

battleass wrote:
so would I be able to run the front end schematic straight into this schematic and be able to have a piezo triggerable envelope generator?


My front end replaces the MFOS front end. The rest of that circuit will function with a single-supply '324.

Quote:
and would I be able to use the LM324 ic for the op amps on the ar generator?


As long as you keep the Attack time short. Both front-ends produce an approximately 10mS pulse, which won't be enough time for the envelope capacitor to fully charge if the Attack pot is set for a long time. The pulse duration can be lengthened in my front end by increasing the .01 cap, and/or increasing C2 AND C3. With too long a duration, though, the percussive quality will be lost.

Quote:
one last question is the external trigger in the front end schematic not neccessary for what I am wanting to do with it?


For bashing away at a piezo you won't need that. It's for my use, to allow manual or sequencer playing.

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battleass



Joined: Mar 22, 2011
Posts: 4
Location: portland

PostPosted: Wed Mar 23, 2011 4:26 pm    Post subject: Reply with quote  Mark this post and the followings unread

I'm confused so I do need to use the mfos schematic but just change the front end part to the schematic that you gave me?
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richardc64



Joined: Jun 01, 2006
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PostPosted: Thu Mar 24, 2011 2:26 am    Post subject: Reply with quote  Mark this post and the followings unread

Sorry. You asked how to make the MFOS circuit work on a single supply.

Change the LF444 to an LM324 with the changes I show to the front-end, U1-A.

Sometimes I give too many choices.

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battleass



Joined: Mar 22, 2011
Posts: 4
Location: portland

PostPosted: Thu Mar 24, 2011 12:35 pm    Post subject: Reply with quote  Mark this post and the followings unread

alrighty sicker

thanks a lot I couldn't have figured this out without ya
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pyrek



Joined: Mar 08, 2011
Posts: 5
Location: sweden

PostPosted: Thu Jun 06, 2013 7:17 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi!
The single supply solution with LM324 was just what i was looking for. Thanks a lot richardc64, few people are that helpful Smile
I have 1 question tho, i want to use the drum trigger for the arduino (only the frontend for now), do i need to modify the circuit to make sure the trigger pulses don't exceed arduino's 5 volt limit?
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richardc64



Joined: Jun 01, 2006
Posts: 611
Location: NYC
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PostPosted: Sat Jun 08, 2013 3:36 pm    Post subject: Reply with quote  Mark this post and the followings unread

pyrek wrote:
Hi!
The single supply solution with LM324 was just what i was looking for. Thanks a lot richardc64, few people are that helpful Smile
I have 1 question tho, i want to use the drum trigger for the arduino (only the frontend for now), do i need to modify the circuit to make sure the trigger pulses don't exceed arduino's 5 volt limit?


Sorry, I didn't see this sooner.

The LM324 will work with 5V supply. (See the DS7 schematic elsewhere.) Alternatively, if powered by 9V the output can be limited with a series resistor and a 4.7volt zener diode.

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pyrek



Joined: Mar 08, 2011
Posts: 5
Location: sweden

PostPosted: Sun Jun 09, 2013 12:56 am    Post subject: Reply with quote  Mark this post and the followings unread

great! thx again Smile))
now i must go check out the ds7 almost forgot about it hehe
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