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samp
Joined: Oct 15, 2016 Posts: 13 Location: Australia
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Posted: Thu Mar 23, 2017 6:15 am Post subject:
Triggering Delay/Loop Pedal With Logic Chip? |
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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 Posts: 1988 Location: West Red Spot, Jupiter
Audio files: 224
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Posted: Thu Mar 23, 2017 10:47 am Post subject:
Re: Triggering Delay/Loop Pedal With Logic Chip? |
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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. _________________ FPGA, dsPIC and Fatman Synth Stuff
Time flies like a banana. Fruit flies when you're having fun. BTW, Do these genes make my ass look fat? corruptio optimi pessima
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PHOBoS
Joined: Jan 14, 2010 Posts: 5591 Location: Moon Base
Audio files: 705
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Posted: Thu Mar 23, 2017 3:08 pm Post subject:
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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. _________________ "My perf, it's full of holes!"
http://phobos.000space.com/
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samp
Joined: Oct 15, 2016 Posts: 13 Location: Australia
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Posted: Fri Mar 24, 2017 4:30 am Post subject:
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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 Location: Australia
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JovianPyx
Joined: Nov 20, 2007 Posts: 1988 Location: West Red Spot, Jupiter
Audio files: 224
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Posted: Sun Mar 26, 2017 5:20 am Post subject:
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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? _________________ FPGA, dsPIC and Fatman Synth Stuff
Time flies like a banana. Fruit flies when you're having fun. BTW, Do these genes make my ass look fat? corruptio optimi pessima
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samp
Joined: Oct 15, 2016 Posts: 13 Location: Australia
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