Wiring diagram for timer and tether.
... line material. The canisters to hold the Pyrodex, made by Pratt Hobbies Inc., had two filaments such that the timer and tether could be wired independently. The timer and tether both had switches wired with their respective batteries to turn them on and off right before flight. The timer also used a break-wire to initiate the countdown. See Fig. 4 for a schematic of the timer and tether. ...
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