I'm trying to build a 555 or 556 timer circuit that creates a 5 second pulse
to activate a small reed relay every 5 or 6 minutes. Can anyone help me
with that. Thank You.
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A 555 (even a CMOS 555) is kind of iffy at 5 minutes, so you might
want to try this instead:
+---------+-----+------+
| Vcc | | | +V
[510K] | +-->[250k] [0.1µF] |
| [100K] | | HC4060 +-------+
| | +-------+------+------+ |K | O----->C
+-------|Rs Rtc Ctc | [1N4148] [COIL]- - -|
| | | | | O--> |
+--|MR Q7 Q13 | +-------+ |
| +------------+----+---+ | +---------->NO
| | | C
+---[1N4148>]---+ +--[510]--B 2N4401
| | E
+---[1N4148>]--------+ |
GND
Set the pot to 160K and the output pulse will be about 5 seconds long
with a time between pulses of about 5 minutes and 20 seconds.