What is the input voltage to the ignition excitor?

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Multiple Choice

What is the input voltage to the ignition excitor?

Explanation:
The ignition exciter is powered from the aircraft’s 28 V DC electrical system. That low-voltage DC feeds the internal timing and oscillator circuitry, which then drives a high-voltage mechanism inside the unit to create the spark delivered to the ignition plug. The spark itself is produced as a high-voltage output, but the input that powers the electronics is 28 V DC. Other voltages don’t fit because 28 VAC is not used—the circuitry requires DC for stable timing and triggering. The higher voltages listed (600 VDC and 3,000 VDC) are associated with the spark output side, not the input supply.

The ignition exciter is powered from the aircraft’s 28 V DC electrical system. That low-voltage DC feeds the internal timing and oscillator circuitry, which then drives a high-voltage mechanism inside the unit to create the spark delivered to the ignition plug. The spark itself is produced as a high-voltage output, but the input that powers the electronics is 28 V DC.

Other voltages don’t fit because 28 VAC is not used—the circuitry requires DC for stable timing and triggering. The higher voltages listed (600 VDC and 3,000 VDC) are associated with the spark output side, not the input supply.

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