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Make Your Own Alternator External Voltage Regulator

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Great circuit if you would like to make your own external voltage regulator for any alternator. Output voltage depends on which zener diode you use. Use a 12 or 13 V zener for charging (1) 12v lead acid battery, and use a 25-27V zener for charging (2) 12V lead acid batteries in series, OR use a 6V -6.2V zener to charge a 6v lead acid battery. You may have to adjust the value of the 1.5K resistor in the schematic to get the 2n3904 to work properly.

Visit Gary's website at: chemelec.com

http://chemelec.com/Projects/Alternator/Alternator-Reg.htm

I used the LOWER schematic!

I used a 3.7K in place of the 1.5K, 900 ohms instead of the 1K, (2) 250V - 2.2uF electrolytic caps instead, and I used (2) zeners in series to get a total of 12.7V which gives the output of 14.7V.

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