Circuit setups for pulse motors

[Artic_Knight]

hey guys the GE diodes have a .25 trigger voltage and the silicon ones .45.  does anyone know of a better diode than GE? im looking for the lowest loss on flow control   the GE diodes arent bad but if i can do better i want to

and if you dont mind me asking, the cuircuit i showed was reported as not professional? how so?

[guruji]

HI guys I build that circuit that is shown by Arctic.The rotor is spinning quite well.
It is giving me on charging battery leads 2.5v reading.It should be that way or something is wrong?.
Back emf does not show up with this circuit on meter?
thanks

[Artic_Knight]

has anyone noticed the largest drop in voltage or the largest electrical sink hole in the curcuit is in the transistor? and with coils do you find a coil is just another coil or is bigger better?

[Ren]

SCR's have a very low voltage drop.

Transistors do have fairly high resistance, especially compared to fets.

One coil is not identical to another if thats what you mean. Bigger can be better, you must first decide what you require from your coil.

[Arkyan]

I built a small Bedini using the diagram posted above and it runs quite well. When I took a coil out of a small fan that seems to be bifilar wound, the circuit would not longer cause my wheel to spin, but instead the coil had a tone coming from it. With the potentiometer at it's 5k ohm maximum the tone was the highest pitched, and as I lowered resistance on it, the tone lowered in frequency until this stopped and I had to spin the wheel again to cause this to restart. The wheel would spin down as the tone wavered until the wheel stopped and then the tone was constant again. Anyone know what was going on here?

Also, this apparently fried my potentiometer, after toying with this, I thought I'd blown my transistor, but it turns out my pot was reading over 2M ohms no matter what I did to it. I now have a 740ohm resistor in it's place and the circuit runs again at least.