This small emergency backup battery systems circuit can be applied to many applications, when the power goes, the battery can provide backup power automatically. This power supply circuit system consists of a transformer, a bridge rectifier and an electrolytic capacitor. And there is a zener diode for controller the output power transistor(BD135 NPN) of this [...]
This small emergency backup battery systems circuit can be applied to many applications, when the power goes, the battery can provide backup power automatically. This power supply circuit system consists of a transformer, a bridge rectifier and an electrolytic capacitor. And there is a zener diode for controller the output power transistor(BD135 NPN) of this [...]