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A description of my home made sound trigger
electronic kit.
The circuit consists of 2 parts. The first part is a very simple microphone pre-amplifier.
The second is the light generator, to trig the Flash.
The distance between the microphone and the sound-source is varied, to get a simple timing delay.
This means that the microphone cant be located on the flash. A simple solution would to just put long wires
on the microphone. But that would not be a god solution, because the long wire would be susceptible for electic noise.
To avoid this the long wire after microphone pre-amplifier instead.
As seen in the picture to the right, the circuit is made so that the white LED fits over the sensor in the flash
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