This circuit was developed to turn a PC via a switch to the touch, but can be used in any circuit, any circuit adapted to bone, heart function is to emulate a button, regardless of whether NO or NC output as the tactile switch is developed based on a double relay investor, ie has a NO contact and one NC to make it easier to adapt.
In practice, as seen in the video works instantly (the video has the audio delayed), but it is noteworthy that the gain of 555 can bring erratic shots if you about a noise source, as fluorescent lamps, transformers, motors, etc. .. within the tube pc no problems because the place where he is staying in an old floppy disk that functions as a Faraday cage and absorbed a great deal of electrical noise and radio waves.
If you want you can weld a plate to gnd as TV tuners, so that there noise.
In the analysis of this circuit is used resitores pull-up and pull-down but values \u200b\u200bsuch that the noise does not cause a shot, could not be operated by touch because the impedance was low, when it increased the impedance and could be activated by touch but unfortunate mind causes electrical noise close shots, so that the best option was housed inside a metal cage.
then be shown the circuit, the PCB (you have to shrink the size, is found in high resolution for better quality of the pcb.) And a performance video (the audio is out of date).
VIDEO
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