Variable Regulator 0-30V 5A by LM723,CA3140,2N3055

This is circuit Variable Regulator power supply,Output voltage 0-30V and Current 5A max. Use IC LM723 is a voltage regulator designed primarily for series regulator applications. By itself, it will supply output currents up to 150 mA I so use Transistor 2N3055 X 2 for Booster current to 5A. IC CA3140 for Control Current and Voltage.
P1-50K for control current.
R20-50K for Adjustable voltage output.
R19-5K for fine Adjustable voltage output.
Transformer use 5-8A, Voltage see in circuit.
Detail more see circuit.

Circuit_Variable Regulator 0-30V 5A lm723_ca3140_2n3055

PCB Variable Regulator 0-30V 5A by LM723,CA3140,2N3055
PCB Variable Regulator 0-30V 5A

Related Links
LM723 variable regulator
5A regulated power supply
CA3140 application circuits

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10 thoughts on “Variable Regulator 0-30V 5A by LM723,CA3140,2N3055”

  1. Dear electronic,
    I wanted to build your own “Variable Regulator 0-30V 5A by LM723, CA3140, 2N3055″ but there are inconsistencies between the PCB and the schema, namely:
    1) R11 = 150 ohms connected to pin 4 or pin 6 of CA3140?
    2) P1 (current) = 50k (scheme) or 5k (PCB)?
    3) R7 = 100k (scheme) or 10k (PCB)?
    4) pin 5 of the mass of uA723 18V with pin 7 (schema) or only R14 and R17 (PCB)?
    5) R13 = 1.5 ohms (schema) or 1.5 k (PCB)?
    Many thanks to those who answer me solve my doubts.
    Thank you sincerely.

  2. Hola amigo
    siento una inquietud
    que es un booster, y que función cumple, en cuanto al diagrama no es muy legible el transformador a utilizar, en el diagrama figura dos entradas u cuales son.
    tienes un email donde pueda escribirte
    saludos Daniel

  3. Hi am a concern regarding this Variable Regulator 0-30V 5A by LM723, CA3140, 2N3055, transformer mention of:
    32 volts as amperage
    18 volt amperage as
    SERIOUS C337 transistor (BC337) is correct as to what would be their equivalent C459
    hugs greetings Daniel

  4. Hey buddy hope not endure inconvenience but this source 50V, ie amplify 20 volts, so that the output gain 50Voltios, and that way you could modify greetings

  5. hello . Thanks to those who respond to my

    1) R11 = 150 ohms connected to pin 4 or pin 6 of CA3140?
    2) P1 (current) = 50k (scheme) or 5k (PCB)?
    3) R7 = 100k (scheme) or 10k (PCB)?
    4) pin 5 of the mass of uA723 18V with pin 7 (schema) or only R14 and R17 (PCB)?
    5) R13 = 1.5 ohms (schema) or 1.5 k (PCB)?

  6. un booster es un reforzador de señales, ya sean señales de audio o radio frecuencia.

  7. Thanks for the schema…
    Yes, there are inconsistencies between the PCB and the schema.
    firstly, i am not sure it works, till i tried to build from PCB (schema is just for the value reference)… the result is working properly as designed.

    for other references:
    32VAC input and 18VAC input MUST be supplied in different source (two secondary windings of single transformer OR use two transformers with 32VAC output and 18VAC output)….

    why???….

    please read the LM723 datasheet, the LM723 use 1.2V reference voltage, so the LM723 can not regulate the output if output below 1.2V!!!… the solution is “zero reference”, simply by crossing the 1.2V reference with negative of 1.2V… good luck.

  8. thanks to giving this circuit ,but some confusion in this circuit like as ,,
    R13- 1.5 k or 1.5 om,input volt – ?,why s1 switch, c7 polarized or not,in4001 like as4007,Q4 c459 not find equiliant transister,how to connect R19and R20 can i shot point 1,2 and 3rd point to R20 plz clear my confusion .
    thanks
    arvind dhakre
    7898948481

  9. hi
    this is better that answers of users asks write in this post for use all of friends
    and
    my question
    R13 is 1.5 or 1.5k ?
    tnx

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