Question #f783d

1 Answer
Jan 26, 2018

Answer:

See the explanation below

Explanation:

www.electronicshub.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