Hello. I am trying to get a 23A108A linear actuator to work using the circuit provided in the attachement. it is rated at 1.4VDC and 3.8 Amps and each transistor is switched on for 500ms then switches off for 500ms, then the next one switches on, etc. in a loop. The pulses to switch the transistors on come from a programmable PICAXE chip. I can feel the stepper motor jerking if I hold it in my hand, but it is not spinning. After taking to a friend with a CRO we noted that the collector of each transistor is not dropping all the way to 0v when it is switched on, it only drops a little bit. However, if I use an LED in place of the motor coil, it does. I am a beginner with electronics so I am not sure what is causing this. Could it be the inductance from the stepper motor? Also, is it correct to drive the motor with 1.4VDC? Because it seems like a weird voltage. I have tried running the motor by placing the wires in order on a battery by hand an it does turn in that situation.
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