Tim37 Posted March 25, 2009 Report Share Posted March 25, 2009 ok i was bouncing around on ebay and found this thing and a idea hit me why not use a low frequency square wave generator to operate a relay in that box that way you have a knob to select the frequency then when you hit the button it would toggle the signal on and off. well now the hard part the electronics are a bit above my head its been 10 years since i messed with any of that stuff so any ideas on how to pull it off. Quote Link to comment Share on other sites More sharing options...
billm90 Posted March 25, 2009 Report Share Posted March 25, 2009 I personally like this aproach. But I know what you are saying. I was going to build something on a foot switch that did the kill, but I wanted to increase it with a pedal much like a wah. push down and the rate would increase. Quote Link to comment Share on other sites More sharing options...
Paul Marossy Posted March 25, 2009 Report Share Posted March 25, 2009 Maybe this could be adapted for use with a guitar? http://www.geofex.com/Article_Folders/automike/automike.htm Quote Link to comment Share on other sites More sharing options...
Donovan Posted March 25, 2009 Report Share Posted March 25, 2009 I built this auto kill switch which is is variable via a knob a few weeks ago. See this topic. http://projectguitar.ibforums.com/index.php?showtopic=39940 To hear just some of how it could be set up, click on the link in my sig and cjeck out the "Helicopter Concept Experiments" clips. The rate of switching and "duty cycle are easily customized to taste. I've not put up a schematic as the originally interested individual did not reply with continued interest. Since, I've learned a bit more about electronics and switching to make this more effective as well. Quote Link to comment Share on other sites More sharing options...
Tim37 Posted March 26, 2009 Author Report Share Posted March 26, 2009 (edited) Might be a cool effect if some one has a old wah laying around to take Donovan's pedal another step with Billm's idea and use the wah as the frequence selector. Btw Donovan i don't see a sig. ok i just didnt load for some reason its there now. Edited March 26, 2009 by Tim37 Quote Link to comment Share on other sites More sharing options...
Donovan Posted April 3, 2009 Report Share Posted April 3, 2009 Here is the draft schematic for the "cleaned up" version. The signal is now very clean, click-free and working great. As an option, swapping the input and output yields a clicking effect on each switch on/off that resembles a helicopter's rotor blades with the right accompanying effects and technique. Also, the resistor network (which is supposed to resemble a potentiometer *** I didn't have a pot symbol, Doh! *** ) and capacitor in the charge circuit are completely customizable to taste. The schematic is a free for all. However, please credit my work where applicable. Hopefully this is error free, but as I drew it directly from my breadboarded model, there may be inconsistencies of which I am unaware. Please bring them to my attention if they arise. Thanks. Quote Link to comment Share on other sites More sharing options...
dude Posted April 3, 2009 Report Share Posted April 3, 2009 Can't you just use a tremolo stompbox on the square wave setting with "depth" turned up all the way? It'll give you the auto-killswitch effect anyway (though changing the rate while playing would be a bit difficult). Quote Link to comment Share on other sites More sharing options...
j. pierce Posted April 3, 2009 Report Share Posted April 3, 2009 The auto kill switch idea has come up a few times at the DIY Stompboxes forum as well. ( I know because I raised the same question there years ago. It's been asked since.) R.G. Keen came up with this circuit: http://geofex.com/FX_images/stutter.pdf Whether or not it's worth a try, I can't say. I don't know if that circuit has been built by anyone, but R.G. knows his stuff. Quote Link to comment Share on other sites More sharing options...
Paul Marossy Posted April 3, 2009 Report Share Posted April 3, 2009 The auto kill switch idea has come up a few times at the DIY Stompboxes forum as well. ( I know because I raised the same question there years ago. It's been asked since.) R.G. Keen came up with this circuit: http://geofex.com/FX_images/stutter.pdf Whether or not it's worth a try, I can't say. I don't know if that circuit has been built by anyone, but R.G. knows his stuff. I've heard about this one. I don't know if anyone has built it, either, but everything RG designs is usually spot on and works great. Quote Link to comment Share on other sites More sharing options...
Donovan Posted April 3, 2009 Report Share Posted April 3, 2009 It is interesting he is using op amps where I have used a mechanical relay. The op amp design is a bit more complex. Not to sway anyone toward my design or away from anyone else's, it's just that honestly, I did not know one could do this an op amp, so I'll be studying that drawing more closely. However, my use of a mechanical relay in place of his semiconductor switching does mean the pedal will click as the relay opens/closes. I was not able to get the semiconductor version to be "click-free" and so went to the micro-relay. This clicking that is present now is NOT part of the signal, but at very low volumes, you may hear it from inside the pedal. Quote Link to comment Share on other sites More sharing options...
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