Fixed Voltage Power Supply

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The fixed voltage power supply is useful in applications where an adjustable output is not required. This supply is simple, but very flexable as the voltage it outputs is dependant only on the regulator and transformer you choose. The maximum output current is 1.5A.

Schematic

This is the schematic of the Fixed Voltage Polarity Power Supply

Parts
Part
Total Qty.
Description
Substitutions
C112200uF 35V Electrolytic Capacitor
C2, C420.1uF Ceramic Disc Capacitor
C3110uF 35V Electrolytic Capacitor
D1, D221N4007 Silicon Diode
BR112A 30V Bridge Rectifier
U11Regulator (See Notes)
T11Transformer (See Notes)
S11SPST 2 Amp Switch
F112A 250V Fuse and Holder
MISC1Heatsink For U1, Line Cord, Case, Wire

Notes

  1. Since this project operates from 120 (or 220, or 240, etc.) volts AC, it MUST be built inside a case.

  2. U1 will reauire a heatsink.

  3. You will need to choose T1 and U1 to match the voltage you want. Use the table below as a reference.

    Output Voltage
    T1
    U1
    5V6V, 1.5A7805
    6V6V, 1.5A7806
    9V12V, 1.5A7809
    12V12V, 1.5A7812
    15V24V, 1.5A7815
    18V24V, 1.5A7818

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Comments

Mir Qadeer Ali
Fixed Voltage Power Supply
Saturday, August 23, 2008 3:40:12 PM
i have constructed 230v ac to 9v dc, by using 12v transformer and 7809 regulator, now am in need of 6v dc, what modification i should from the above, or i have to built seperate circuit by using 6v transformer and 7806 regulator, let me know by my email as soon as possible , thank you
Graham
Fixed Voltage Power Supply
Wednesday, May 21, 2008 1:01:12 AM
Hi, Please help me I need to step down DC voltage from +/-13 -14.4V to 11.5 - 11.9V @ 3A DC can you help?
Stram
Fixed Voltage Power Supply
Tuesday, April 29, 2008 11:22:24 AM
a friend from U.S.A. gave me an HP Printer/Scanner without a power supply, since i am fond electronics assembling, i want to assemble a 24V greater than1.5A fixed regulator. Please help and provide me Thank you very much, STRAMM
Maxspower
Fixed Voltage Power Supply
Tuesday, April 15, 2008 4:37:08 PM
"What si the prupose of the fuse and capacitors" . . . love it! LOL
sammaking
Fixed Voltage Power Supply
Tuesday, February 26, 2008 5:31:39 AM
please help me out with the circuit diagram of a variable dc output (-12,+12 & +5v) power supply of 110v ac input
eliya
Fixed Voltage Power Supply
Tuesday, February 19, 2008 12:16:11 AM
how about if the output voltage is 25 Vdc and the maximum output current is 5 Ampere? how the circuit going to be?this power supply will use the source from 240 Vac.can u please help me on this problem.reply to my email.thank you
mebrahtu
Fixed Voltage Power Supply
Friday, January 04, 2008 1:43:54 AM
In the above citcuit u1 means transistor please explane
Joe Soup
Fixed Voltage Power Supply
Tuesday, January 01, 2008 1:10:54 AM
What is the requirement on the voltage capacity of the .1uf disc capacitors? I looked at radio shack and the only ones they have listed are 50v. Would this be too much, since the other voltages seem to be 35v?
demz
Fixed Voltage Power Supply
Monday, December 10, 2007 4:31:16 AM
how about if the maximum output of the fixed voltage power supply is 6ampere?
manu thakur
Fixed Voltage Power Supply
Sunday, December 09, 2007 7:28:46 AM
i want to make a power supply of 5v & 12 v by using a single transformer help me....
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