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Step 4Wire the Electronics
All of the electronics of my Bike Generator were reused and I added the AA battery car charger. The circuit from Bike Generator needs to be changed slightly though. For instructions on how I put together the circuit refer to Bike Generator. For BikeGen I wanted to be able to recharge batteries while I rode and then use those batteries to power both the headlight and tail light. I wanted a good charge controller as well so that the batteries would not be over charged. I looked at a few charge controller kits that you solder together be decided to hack something instead. So I found thisAA Car Charger on ebay and was able to get it shipped for less than $7. This charger has a 1amp charge rate and can charge two AA's in two hours in a car. It also has a trickle charge feature that maintains full battery charge. This is perfect for what I wanted. Also because I was going to output 12volts I got a car power outlet so that I could recharge my cell phone as well.
The variable voltage regulator needs to be set up to output roughly 12 volts. Here is all the information you'll need on the voltage regulator LM317 Voltage Calculator I chose to shoot for 13.75volts, because I have measured the power outlet in my car and its usually over 12 volts. Also I could reuse the 220ohm resistor for 13.75volts. The original 220ohm resistor needs to be desoldered and then placed in the same location as the 150ohm resistor. The 2200ohm resistor can then be soldered in the place of the 220ohm resistor. I then used a dremel to spin the motor to make sure the regulator was working right. It output 13.88volts which was right on the money.
So the original Bike Generator circuit will rectify the AC power from the motor and regulate the voltage to 13.75volts. That power will then be fed to the charger circuit. The charger is then connected to a DPDT switch which is used to switch the batteries form the charger to the lights.
The variable voltage regulator needs to be set up to output roughly 12 volts. Here is all the information you'll need on the voltage regulator LM317 Voltage Calculator I chose to shoot for 13.75volts, because I have measured the power outlet in my car and its usually over 12 volts. Also I could reuse the 220ohm resistor for 13.75volts. The original 220ohm resistor needs to be desoldered and then placed in the same location as the 150ohm resistor. The 2200ohm resistor can then be soldered in the place of the 220ohm resistor. I then used a dremel to spin the motor to make sure the regulator was working right. It output 13.88volts which was right on the money.
So the original Bike Generator circuit will rectify the AC power from the motor and regulate the voltage to 13.75volts. That power will then be fed to the charger circuit. The charger is then connected to a DPDT switch which is used to switch the batteries form the charger to the lights.
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Mar 14, 2010. 12:52 PMrpvanpatt
says:
hey just quick question, would it work if I just took the circuit and switch directly to a car output?
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