The switch on the e-trigger is a standard active-low input to a
micro-processor I/O port, which is why the current is so low. The
micro-processor then combines the input with the current operating state
(e.g., firing mode, trigger lock-out, etc) and, if firing is warranted,
activates a FET on the e-trigger board to provide power to the solenoid
for no more than 5 ms. The short burst is sufficient to trip the
mechanical sear, but not long enough to draw a lot of current from the
9V transistor battery that powers the e-trigger board. A large
capacitor recharges the firing circuit in just a few milliseconds after
it is fired.
You left out two other options for firing an e-trigger:
5) Use a door-lock actuator to pull the manual trigger.
6) Use a prototype Cheap Control Systems Servo Switch board to drive the
solenoid directly, thereby completely replacing the mechanical trigger,
mechanical switch, e-trigger board and the 9V transistor battery.
Battle Tested. Tri-Pact Approved.
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