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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 attachments
I Attachment History Action Size Date Who Comment
PDFpdf Maxim.pdf r1 manage 12.6 K 2008-08-31 - 16:55 PeterKammel  
PDFpdf PCB__balloon.pdf r1 manage 17.6 K 2008-08-23 - 17:00 PeterKammel  
PDFpdf PlanetEngineers.pdf r1 manage 11.0 K 2008-08-31 - 16:55 PeterKammel  
PDFpdf TARGET__balloon.pdf r2 r1 manage 15.1 K 2008-08-23 - 05:02 PeterKammel  
PDFpdf newark1.pdf r1 manage 13.3 K 2008-08-31 - 16:54 PeterKammel  
PDFpdf newark2.pdf r1 manage 11.2 K 2008-08-31 - 16:55 PeterKammel  
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Topic revision: r3 - 2008-08-31 - PeterKammel
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