– The rectifier diodes drops the voltage as a side effect by about . So after you make DC from your 12V AC transformer, you would measure just about DC output. That is the voltage level of a very depleted 12V battery, so it is totally inappropriate as a charger.
– LM7815 only can reduce voltage to a stable 15V from a higher voltage, at least from
– An LM7812 would also fail to produce 12V stabilized voltage with an input less than
– To charge a lead acid 12V battery you will need at least
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