555 timer for relay operation,15min on,15min off?

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555 timer for relay operation,15min on,15min off?

cicuit please.
john

2007-01-16 04:52:59 · 2 answers · asked by Anonymous in Consumer Electronics ➔ Cell Phones & Plans

2 answers

These times are very large for a 555. Make sure you use a low leakage capacitor such as a tantalum bead. Even so, it may not work at all. Make sure you use a CMOS 555

The circuit timing is liable to be affected by damp etc because of the low charge currents

2007-01-16 13:15:10 · answer #1 · answered by amania_r 7 · 0⤊ 0⤋

See this website:
http://home.cogeco.ca/~rpaisley4/LM555.html#3
and
http://www.doctronics.co.uk/555.htm

2007-01-16 05:02:05 · answer #2 · answered by credo quia est absurdum 7 · 0⤊ 0⤋