Circuit setups for pulse motors

[Nastrand2000]

You got it exactly! The pot changes the level of voltage in the transistor, thereby changing the current to flow in the driving coil. The more resistance the pot produces, the less current in the driving coil. the less resistance the pot produces, the more current to the driving coil.
Jason

[Nastrand2000]

You have to think that a transistor is like a tunnel allowing flow. The less resistance to flow means a bigger tunnel for electricity to flow. More resistance means a narrowing of that tunnel, thus allowing less electrical energy to flow(less amperage). The same voltage is always going to flow, this is where the analogy between water and electricity differ. By narrowing a tunnel of water, the pressure would rise, but not with electricity( the voltage will stay the same).  Voltage is sometimes referred to as pressure, but this is a misnomer.
Jason

[Nastrand2000]

And the trigger coil is what allows this flow to either increase or decrease
Jason

[Nastrand2000]

Ren,
I was wondering the size of cap, how many microfarads and the voltage max of the cap. Also, what is the voltage you are putting in. If I remember correctly it was 12 volts (me being lazy and not looking at previous posts).
Jason

[Ren]

jase I ripped apart an old crt monitor and ripped a couple of caps out of there. I'll make some vids when I get it up and running. Just running the secondary thru a bridge (puts out about 3.5 volts) I was filling a cap (I think it was 330 uf 100v) to about 80 volts. Thats not from collector or emmiter. Oh and I charged a 9 volt like you suggested! It went from 7.5 to 8.02 in about 20 min. (Actually it went to 9+ but settled later that night to 8.) This is the voltage created in the secondary of 1 coil alone. Running at 12v, 0.7 of an amp.