## Why doesnt this circuit work?

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### Why doesnt this circuit work?by giorulesall » January 4th, 2010, 7:40 am

The idea of this was to create ac power to run a voltage multiplier...i used a battery to run a motor, the spinning part is connected to an identical motors "spinning part". the two wires leading from this motor(which usually supply power) are now or course outputting a small amount of ac power. each one of these connects to the base of two separate transistors which have their collectors connected in parallel to a 9v battery. the emitters of these two npn transistors (which should supply larger amounts of ac voltage) each are connected to one of the inputs of a voltage multiplier.( i built this with np ceramic caps im not sure if that might be the problem). from this point the obvious problem is that we do not have a complete circuit. so the two lines from our motor each connect to another npn transistor (the same model as the others). The collector is connected to the opposite side of the voltage multiplier when compared to the other transistor(which is connected to the same wire from the motor) and the emitter runs back into the negative of the battery. the idea is that no current flows until the motor starts. This opens up 2 transistors; the first allows the current to flow into the voltage multiplier and the second allows it to be a complete circuit which runs back into the battery. im sorry if this was complicated.... i just don't know exactly where i went wrong... any help will be appreciated! THANKS!!!
giorulesall

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Joined: October 21st, 2009, 7:40 am

### Re: Why doesnt this circuit work?by Technobuff » February 8th, 2010, 8:01 am

If it's a DC motor driving an identical motor, it will be outputting DC, with a varying amplitude (voltage). Thus, you will not be driving the transistors as you intended. One is seeing a positive voltage, the other negative only with respect to the base of the other.
You need a true AC input, so the transistors turn on sequentially.

Technobuff

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Joined: January 14th, 2010, 7:40 am

### Re: Why doesnt this circuit work?by Mark G » May 28th, 2010, 8:35 am

Dip trace offers a 250 point freeware version of their schematic drawing software

http://www.diptrace.com/

You can then use pdf995 (an adware / free software) to print the schematic as a pdf and post it on a file/photo sharing site.

Mark G

Posts: 1
Joined: October 26th, 2009, 7:40 am

### Re: Why doesnt this circuit work?by billrussell42 » May 30th, 2010, 8:35 am

Can you supply a schematic?

But one point, you are apparently using the two motors for a low power AC source ! That's a rube goldberg if I ever saw one. Junk that and use a 555 in the free running mode. Pick a frequency like 10 kHz.

Your transistor wiring is totally weird, and won't work, from your description. You need to start with basics. Let me know what you hope to acheive and perhaps I can help. But wiring transistors together this way won't get you anywhere.

.
billrussell42

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Joined: May 17th, 2010, 8:40 am