Battery eliminator circuit

Description.

Here is the circuit diagram of a battery eliminator circuit that can be used as a replacement for 9V PP3 batteries. The circuit given here can be used to power any device that operates from a 9V battery. The transformer T1 steps down the mains voltage and bridge D1 performs the job of rectification. Capacitor C1 is a filter. IC LM317T is the regulator here. The value of R1, R2 and R3 are so selected that the output voltage of IC1 will be steady 9 volts.

Circuit diagram.

battery eliminator circuit

Notes.

  • Assemble the circuit on a good quality PCB.
  • Transformer T1 can be a 230V primary, 9V secondary, 1.5A step down transformer.
  • If 1A Bridge is not available, then make one using four 1N 4007 diodes.
  • Do not connect loads that consume more than 1.5A to this circuit.
  • A heat sink is recommended for IC1.
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