Question #f783d

1 Answer
Narad T.
Jan 26, 2018

See the explanation below

Explanation:

![www.electronicshub.org](useruploads.socratic.org)

Here is a circuit diagram for a 12 "V" "DC" power supply.

The materials required are :

  • The transformer " TR1 ""230 V AC" "input", 15V-0-15V " 1A" " output"

  • 3 diodes "D1 , D2 and D5 " "reference" "1N2007"

  • 1 voltage regulator "LM317T"

  • 1 Zener Diode "D6 " "11.0V 1W"

  • 1 capacitor "C1 " "470 "muF

  • 1 transistor "NPN " " Q1" " BD139"

  • 2 LEDS, one red , one green

  • 1 adjustable resistor "RV1 " " 10" kOmega

  • 5 resistors "R1 to R5 " " 1" kOmega, "240"Omega " 1/2W, "

"2.2 " kOmega, "1 " kOmega, "100 "Omega " 1/2W"

  • Heat sink for the transistor

  • switches, wires, solder, board , box

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