I am attempting to create a dual pedal mod for Rock Band. The purpose of this is to allow very rapid pressing of both pedals without them interfering with each other. Each pedal needs to work regardless of what the state of the other pedal is.
I've found this circuit online and built it. It doesn't satisfy me as it seems to ignore pedal presses on one pedal if the other pedal has just been pressed.
http://imakeprojects.com/Projects/rock-band-dual-bass-drums-controller/Gfx/high-res/h_HPIM2372.JPG
As far as I can tell the point of this schematic is when the pedal is pressed, 5v goes into the inverter and 0v comes out. This causes the cap to charge. With 10kohm resistor and a 10uF cap this is .01s worth of charge. During which I believe, but am not certain that all the current flows into the cap and none into the inverter, causing it to put out a 5v signal for a short time which triggers the transistor and then the relay sending a single shot pulse to the real drum controller.
I have been chatting with friends and some think that using a mosfet instead of a relay may be a better solution.
Anyways, what I'm looking for is improvements to the schematic, and if necessary a complete reconstruction of something better/simpler/more efficient.
Also, will a basic 9v LM7805 power supply be enough for the schematic I've linked to? I believe the relay I used draws ~300mA of current when it opens. This seems like a lot to pull from a 9v. Thanks for any help you can afford.
I've found this circuit online and built it. It doesn't satisfy me as it seems to ignore pedal presses on one pedal if the other pedal has just been pressed.
http://imakeprojects.com/Projects/rock-band-dual-bass-drums-controller/Gfx/high-res/h_HPIM2372.JPG
As far as I can tell the point of this schematic is when the pedal is pressed, 5v goes into the inverter and 0v comes out. This causes the cap to charge. With 10kohm resistor and a 10uF cap this is .01s worth of charge. During which I believe, but am not certain that all the current flows into the cap and none into the inverter, causing it to put out a 5v signal for a short time which triggers the transistor and then the relay sending a single shot pulse to the real drum controller.
I have been chatting with friends and some think that using a mosfet instead of a relay may be a better solution.
Anyways, what I'm looking for is improvements to the schematic, and if necessary a complete reconstruction of something better/simpler/more efficient.
Also, will a basic 9v LM7805 power supply be enough for the schematic I've linked to? I believe the relay I used draws ~300mA of current when it opens. This seems like a lot to pull from a 9v. Thanks for any help you can afford.