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2017-08-18 09:04  
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Power is applied to the circuit with the initiate switch open. The 25-JtF capacitor charges through the A14, or equivalent, diode and 2.2-KO resistor to full supply voltage. When the initiate switch is closed, the low side of the capacitor is suddenly raised to 12 V. This raises the diode side of the capacitor to approximately 24 V.

The capacitor immediately begins discharging through the seriesconnected 1 and 3.3-MO resistors. Eventually, the C13 gate becomes forward biased, the device turns, and it applies power to the relay. The delay is virtually independent of supply voltage.

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