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And how it works :
12V apllyed to to coil of the first relay (between 86 and 85)
This activates connection between 87 and 30 so current can flow to the coil of the second relay with will load the capacitor.
Moment capacitor if full, potential level between 86 and 85 will become 0 volts and coil 2th relay falls off.
Puls generated.
By take off the 12 volts :
Coil 2th relay (pin 86) connects to ground.
Capacitor discharges via coil
Coil active (87 connected to 30)
Capacitor discharged
Coil falls off.
Puls generated.
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