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Step 3Picture of the backside rotated
Here is the backside of my custom board, you can use predrilled prject boards, I just wanted it as compact as possible.
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Nov 6, 2009. 5:47 PMsubbatonikk
says:
2 suggestions for improvements: 1) To isolate the output of your circuit from the firework starter you could add a 'normally off' relay to your output. When cellphone rings the relay is energised and completes a circuit to the battery. This would eliminate the problem of the always present voltage on the output. Would probably need a small transistor added also to provide the energizing current. 2) Many cellphones have jacks for a headset which deactivate the speaker. Wiring a lead with the right size plug to your circuit would allow you to attach/remove cellphone without having to modify it. I built a cellphone activated circuit which switched (sequentially) a series of 8 relays to control various test equipment remotely but I relied on 'sound' activation. The problem with this is ambient noise can trigger it. I will be looking at incorporating your idea. Thanks
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