The single-junction transistors BT33, C3, W1, W2 and other components constitute a relaxation oscillator, and the generated pulse signal is sent to the control electrode of the thyristor SCR1 via the isolation diode D4. Adjusting the resistance of W1 can change the trigger conduction of the SCR1. The angle, which changes the charging current. The thyristor SCR2, relay J, W3, W4, D5 and other components constitute a battery full-charge automatic protection circuit. When the voltage across the battery is charged to the upper limit set by W3 and W4, D5 is turned on, and SCR2 is triggered. Through, LED2 shows that the relay is closed, and J switches to normally open, which cuts off the control pulse concentration of SCR1, that is, stops charging the battery. K2 is a 12V, 24V battery charging switch, shown in the 12V position.
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