ceiling fan generator current problem

Thread Starter

keithg

Joined Jan 17, 2009
40
I have an LM317 regulating voltage from a bridge rectifying circuit to charge a 12v motorcycle battery. Voltage measures about 14 but current is only .03 amps. Can I simply change the 240 ohm resistor from the out pin or is this more complicated? Would a Darlington transistor increase current. Not very experienced unfortunately. Would appreciate any advise.
 

Thread Starter

keithg

Joined Jan 17, 2009
40
Yes, 2200 50V for each coil. Output seems to be smooth. I am trying to make a pedal generator to charge a lead acid 4v battery for remote villages without power for lighting. The generator is putting out about .4 amps and 60 volts dc after rectifying. I chose a typical LM317 regulating circuit instead of something specifically for lead acid battery charging. I brought many components from the States but don't have the exact parts for several possible circuits. Would you please advise if there is a substitute for BC547?


file:///Users/keithgum1/Desktop/lead%20acid%20Battery%20charger.webarchive

------BC 547

or, please suggest another circuit.

Last question: Is there such a thing as a current doubler? I tried a Darlington transistor to boost current but was not successful (yet). It appears we need more current and less voltage?
 

beenthere

Joined Apr 20, 2004
15,808
That is a transformer. A step down transformer will output a lower voltage than the input, but at a higher current.
 

Thread Starter

keithg

Joined Jan 17, 2009
40
I am ten hours from the nearest electronics shop in Manila. Is there any commonly used transformer (radio,etc) I might adapt for this purpose? Would the leads of the generator be soldered directly to the transformer?
 
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