220v sirYou haven't told us about the primary voltage. If it's 220v, and you have 120v available you could connect the primary to 120v. Half voltage in equals half voltage out.
220v sirYou haven't told us about the primary voltage. If it's 220v, and you have 120v available you could connect the primary to 120v. Half voltage in equals half voltage out.
Sir I unwind some turns until I get 12v but I notice a buzzing noise from the transformer.Yes, I know. 11 - 12 VAC RMS has a peak voltage of ~ 15.5 - 16.9 volts.
So once you factor in rectifier forward voltage drops and the unavoidable line losses plus the very narrow duty cycle that the peak of the sine wave is above the voltage required to pass current through the system and 11 - 12 volts AC gives you a nice solid 14 - 15 volt DC average as needed for bulk charging a common LA battery without excessive overcharging.
I've been repairing and rebuilding battery charges since I was a kid. Believe me I know my as applied to reality numbers for basic battery charging circuitry by now.
by Jake Hertz
by Duane Benson