Today I test the the driver board that I just soldered up. My vintage digital logic trainer is pretty much the perfect 5V signal source as it does not supply enough current to run the motor on its own without a bit of a push to jump start the wheel (it is probably 1 Amp or less). I hooked the 9V battery and hooked up one of the trainer's data switches to the signal for a motor. Nothing. Hmm, the voltage on the data switches does not seem to work the way i thought it would (found out later that I needed pull-up resistors). Well, then I tried the 1Hz signal output from the trainer, and success!:
The motor is definitely pulsing up to the full 9V speed, using only a weak 5V pulsing signal. Exactly what I need! I am so happy that worked, as trouble-shooting the circuit and changing it for each of the 4 channels would have set me WAY back.
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