You can adjust the output voltage from 0V up to 12V with variable resistor R2. This circuit can handle a 1 ampere current. The 317 must have a heat sink. The charger output is 6V, you can use the charger to charge your mobile phone battery.
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Electronic parts list:
Semiconductor:
LM 317 – 1pc
LED – 1pc
1N 4001 – 8pcs
Capacitors:
25V/470uF – 1pc
25V/10 uF – 1pc
Resistors:
1k, 1/2W – 1pc
220R, 1/2W – 1pc
5kR Potentiometer – 1pc
Others:
1Ampere, Multi-tap Transformer – 1pc
AC Chord – 1pc
Casing – 1pc
#22 Stranded Wire – 3m
Heatsink for TO220
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