Go to Home Page   Home
Information   Information
Finding Transformers   Transformers
About Capacitors   Capacitors
Types of Voltage Regulators   Volt Regulator
T13.8 Volt Power Supply   Schematics
Using Pass Transistors   Pass Transistors
Modification to Astron   Modifications
Parts   Parts
Transformer Symbol   Transformer Symbol
12 Volts to 5 volts   DC-DC Conversion
Repair your own power supply   Repair Your Own
Trace Side of Regulator   Reg PC Board
Finished View of Regulator   Assem. Reg PCB
Walk You Thru Repair   Repair Tutorial 1
Walk You Thru Repair   Repair Tutorial 2
RF Proof   RF Protection
Calculate Wire Size   Power Calculator
Ham Radio Links Page   Amateur Radio Links
Heat Sinks and Cooling   Heat Sinks Cooling
Crow Bar Over Voltage Protection   Crow Bar Circuit
Pass Transistor Schematic Configuration   Pass Trans. Config.
Output Transient Suppressor Network   Output Protection
Current Limit Resistor Network   Current Limiting
KB7KBT Amateur Radio Page   My Ham Radio Page
This web site design and maintained by GFM Designs   GFM Designs
Link to an awesome graphics program page   Graphic Program
Manufacturer Specification page..   Spec. Sheets
Replacement circuit page.   Replacement Circuit
Site Map page.   Site Map
Projects.   Projects
Power Supply Load Tester.   Load Tester

Best viewed with
at least
1024 x 768
Screen Resolution

bigun project transformer

"Bike Generator" Project

Russ, N0BTI wanted to cut his bordom while doing his daily exersise. This is what he came up with. It charges a battery that powers a small portable TV set.

bike generator project

If anyone wants a real close up of this image, email Russ, N0BTI. You can get his email address from

"The output of my generator, which is a permanent magnet DC motor, can be as high as 120 volts DC. I wish to run this generated current into a 13.8 volt storage battery."


"I attached my permanent magnet DC motor to my drill press. At about 850 RPM (2:1pulley-1725 RPM drill press motor), two 12 volt headlights connected and a voltmeter/amp meter also connected. I read 14 volts at the motor and 12.5 volts at the lights. 7.8 amps total current. I'm using flimsy test leads so I'm losing 1.5 volts. The leads do get warm quickly. The motor is rated at 110 volts DC at 12 amps and 3100 RPM. This motor came from a high end treadmill. Perhaps I don't need a regulator after all. Open circuit volts at 850 RPM is 29+/-. Think I should just forget about a regulator? I suppose the next step is hook it to a car battery and see what happens. I will need a hefty blocking diode to keep the battery from trying to run the motor I think."


"Well I completed my bike generator project mostly. Don't need a regulator for battery charging. It works just fine hooked direct through a diode. Without the diode, the motor runs backward. The diode I'm using is 10 amps and 6 ohms forward resistance. Going to try Radio S. for one with less forward ohms. As it is, I'm able to pump 3 amps into the battery at a generator voltage of 14.5. It's really quite a bit of work though and thatís only 43 watts of power. I have read that a person in good bike shape can do 80 watts continuous. Maybe Lance Armstrong."

© CopyRight 2002-2019 All Rights Reserved
Site Developed and Maintained by: kb7kbt

Designed by KB7KBT

Updated on Friday, 01~18~2019
Back to the TOP
space filler