Canon EOS wireless camera activate mod

I bought these wireless door bell transmitter from the local supermarket for less than 4 Euro. The printed circuit board contains a sound module but this is not of interest. I removed the "silent alert" LED and disconnected the npn transistor from the "speaker" source. The "play" input of the sound module is provided by the decoder IC ( you can only see the solder switches ) which is redirected to control the base of the transistor. The little beast drains the batteries within a few days so I cut the switch that disables the speaker to have a power on/off switch. I only added the 2.5mm connector, removed the LED and rearranged some connections ( I used the green wires from the speaker ). Unfortunately I only had a mono connector so the middle ring of the 2.5mm plug is permanently connected to the outer ring. Thus, the "focus" signal is permanently on. However, it works fine so far.



http://www.youtube.com/watch?v=MQ5pKeYrBc8&hl=en

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