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 Forum index » DIY Hardware and Software » Circuit Bending
Triggering Delay/Loop Pedal With Logic Chip?
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samp



Joined: Oct 15, 2016
Posts: 13
Location: Australia

PostPosted: Thu Mar 23, 2017 6:15 am    Post subject:  Triggering Delay/Loop Pedal With Logic Chip? Reply with quote  Mark this post and the followings unread

Hi,

Just wondering how I would go about automatically triggering a momentary pushbutton within a guitar pedal(Behringer DD100) by using a CMOS chip.

I would like to connect a logic oscillator to the pushbutton to control its on-off state. Could the chip's digital +9V output be enough to turn it on, or would I need a transistor for the switching?

Thanks for any help!
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JovianPyx



Joined: Nov 20, 2007
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PostPosted: Thu Mar 23, 2017 10:47 am    Post subject: Re: Triggering Delay/Loop Pedal With Logic Chip? Reply with quote  Mark this post and the followings unread

samp wrote:
Hi,

Just wondering how I would go about automatically triggering a momentary pushbutton within a guitar pedal(Behringer DD100) by using a CMOS chip.

I would like to connect a logic oscillator to the pushbutton to control its on-off state. Could the chip's digital +9V output be enough to turn it on, or would I need a transistor for the switching?

Thanks for any help!


I am assuming the pushbutton is SPST. If so, one gate from a 4066 or 4016 with the gate pass-through terminals connected in parallel with the switch might do it. When the 4066 pass-through gate is not "closed", the pedal will still work with the pushbutton.

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PHOBoS



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PostPosted: Thu Mar 23, 2017 3:08 pm    Post subject: Reply with quote  Mark this post and the followings unread

4016 or 4066 as scott mentioned will probably be your best bet and work in most cases. There are other options
which could be preferable because you wouldn't need a whole chip but it depends on how the switch is connected.
If it connects to GND then a single transistor will do or even the output from a logic gate directly with a diode in series.

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samp



Joined: Oct 15, 2016
Posts: 13
Location: Australia

PostPosted: Fri Mar 24, 2017 4:30 am    Post subject: Reply with quote  Mark this post and the followings unread

Fantastic, thanks guys.

Good to know it's easier than I thought. I will try it with diodes/transistor if no luck.
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samp



Joined: Oct 15, 2016
Posts: 13
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PostPosted: Sat Mar 25, 2017 9:51 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi Again,

So I've wired this up, (see attachment) using a Schmitt trigger>4066>pedal button.

The pedal is being triggered, but at a really high frequency which I can't control with the oscillator.

Am I approaching the 4066 wrong? Maybe I need to desolder the pedal button.

Thanks


Delay Trigger.jpg
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Delay Trigger.jpg


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JovianPyx



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PostPosted: Sun Mar 26, 2017 5:20 am    Post subject: Reply with quote  Mark this post and the followings unread

That looks correct.

"high frequency" triggering would have me believe that the 40106 oscillator is running at a high frequency. Do you have a scope so that you can check that? You don't show any values for C and R for the oscillator - that's important since those two components determine the frequency of the oscillator.

Is there any chance you have a schematic for the pedal?

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samp



Joined: Oct 15, 2016
Posts: 13
Location: Australia

PostPosted: Mon Mar 27, 2017 7:14 am    Post subject: Reply with quote  Mark this post and the followings unread

Got it switching! Woo!

I think because of the type of pedal button, it needed two oscillators from the 40106. Got the idea from Hackaday http://hackaday.com/2015/08/07/logic-noise-4046-voltage-controlled-oscillator-part-one/#more-163851

Thanks for the help and suggestions.
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