If you implement a regulated power supply, you must first regulate the circuit. In the voltage regulation, a transformer can be used to complete. The circuit must be rectified by changing the input AC voltage to DC. This design uses a full-wave bridge rectifier circuit for rectification. Then adjust the input voltage. In terms of adjustment. Adjustable with a three-terminal positive voltage regulator (LM317). The current amplitude changes greatly after rectification, so it is necessary to filter the current with a capacitor. Then output it.
Circuit module analysis:
Voltage regulation -> rectification -> voltage regulation -> filtering -> output
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