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Here is a schematic of the timer circuit. The component packages are not identical to the ones used. Nevertheless we also attach a PCB layout, to give a better representation of a possible geometrical arrangement. We use a 9V battery as the voltage source. The time delay fuses have not been installed and tested yet. Up to now we used a fixed 1-3 M resistor for R1, we have to test whether our 1M pot is sufficient. Please note that electrolytic capacitors and LEDs are polarized. The relay has only 4 connectors, check the datasheet for proper connections. First test the circuit without the resistive wires. The resistive wire gets hot, so be careful not to touch it.

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Topic revision: r1 - 2008-08-23 - PeterKammel
 
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