6.3V220UF Volume: 5X8 own factory direct sales - solid capacitor - patch aluminum

Probe domestic switch needle KG300B head diameter 3.0 normally closed switch needle total length is 5

Photocoupler

As shown in the figure, the circuit diagram of the fully automatic self-shutdown charger. This circuit can be used to charge 2 to 4 AA batteries. A constant current source circuit is formed by the MC7805 and the resistor R1. R1 determines the constant current value. When R1 takes 68Ω, the constant current is 50mA. VT1, VT2 and relay J constitute a self-shutdown protection circuit for the charging power supply. The battery to be charged is at least 2 knots, and up to 4 batteries can be connected in series. When the protection circuit is adjusted, a regulated power supply can be used instead of the battery. The adjustment method is as follows: when charging, when the voltage at point A reaches the specified value, the potentiometer RP is adjusted to release the relay J, and the entire power source is cut off. At this time, the battery terminal voltage should be the charge termination threshold voltage. It should be noted that the same is the No. 5 nickel-cadmium battery, the manufacturer is different or different from the old and the new, the threshold voltage can be unequal, generally 1.4~1.55V per section.