Each other need diference voltage range, as example radio need 12V, toys need 3V or 9V, selluler phone need 2 to 5 volt, of course is very expensive choice if we buid one power supply to each voltage needed, Thank's God for LM317 , 3 pin 1 Ampere variable voltage regulator, i can adjust the output voltage from 1,25 volt to maximum voltage (Vin-3), here the circuit :
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