0 to 25-volts power supply

Discussion in 'The Projects Forum' started by llinocoe, Mar 3, 2009.

  1. llinocoe

    Thread Starter Member

    Sep 30, 2008
    10
    0
    my project is to make a 0 to 25-volts adjustable one-ampere power supply,i bought its kit but don't understand its circuit or simulate the output voltage. can anyone explain its schematic diagram.

    here's the materials:
    ZERO TO 25 VOLT ONE-AMPERE IC REGULATED POWER SUPPLY
    Semiconductor
    IC1 – LM723CN Voltage Regulator
    Q1 – 2N3053 NPN 5-watt 40-Volt transistor (TO-5)
    Q2 – 2N3055 NPN 115 watt 60 Volt transistor
    D1, D2, D4, D5, D6, D7, D8- MP5081 rectifier diode[​IMG]
    D3 – 1N5401 rectifier diode

    Resistors ( All are ¼ watt ± 5% tolerance carbon composition type unless otherwise specified.)
    R1, R2, R4 - 3.3 Kilo ohms
    R3 - 1 Kilo ohms trimmer
    R5 – 4.7 Kilo ohms trimmer
    R6 – 2.5 Kilo ohms linear taper potentiometer
    R7 – 100 Ohms
    R8 – 220 Ohms trimmer
    R9 – 270 Ohms
    R10 – 1 Ohm 1 watt ± 10% tolerance
    R11 – 1 Kilo ohm 1 watt ± 10% tolerance

    Capacitors
    C1 – 0.001 µF/100 Volts polyester capacitor
    C2, C5, C7 – 0.1 µF/100 Volts polyester capacitor
    C3 – 100 µF/50 Volts electrolytic
    C4 – 2200 µF/50 Volts electrolytic
    C6 – 1000 µF/25 Volts electrolytic

    Others
    T1 – Step down transformer 220/110 Volts primary; 28 volts at 1.5 amperes and 12 Volts at 0.5 ampere secondary – ACT-28150M12
    Analog Voltmeter 0.30 Volt range
    Analog Ammeter – 0-1 Ampere range or better
    Terminal posts (1 red and 1 black)
    Potentiometer knob
    Toggle switch (SPST) as ON/OFF switch
    Neon lamp – 220 Volts
    AC line cord with plug
    1 – ampere fuse
    Fuse holder
    14- pin IC socket
    PCB
    Mica insulator (TO-220)
    Transistor spacer (2 sets)
    1/8” x ¼” bolts and nuts – 2 pcs.
    1/8” x ½ “ bolts and nuts – approximately 10 pcs.
    No. 20 AWG insulated hook up wire – 2 meters
    Rubber grommet, enclosure, solder, etc.
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Google "lm723" and get the data sheet - it will explain itself.
     
Loading...