Power Supply


Author Views Views Today Rank Comments
144,934 100 223
When working with electronics, you always need one basic thing; power. This power supply is great for powering all kinds of electronic projects. It produces a well filtered, variable 1.2-30 volts at 5 amps. It is easy to build and the parts are realitively easy to find.

Schematic

This is a schematic of the Power Supply

Parts

Part
Total Qty.
Description
Substitutions
C1114000uF or 10000uf 40 VDC Electrolytic Capacitor
C21100uF 50Vdc Electrolytic Capacitor
C310.1uF Disc Capacitor
C410.01uF Disc Capacitor
R115K Pot
R21240 Ohm 1/4 W Resistor
U11LM338K 1.2 to 30 Volt 5 Amp Regulator
BR1110 Amp 50 PIV Bridge Rectifier
T1124 V 5 Amp Transformer
S11SPST Toggle Switch
MISC1Wire, Line Cord, Case, Binding Posts (for output)

Notes

  1. The regulator comes in a TO-3 case and MUST be used with a LARGE heatsink. You may want to mount a small fan to blow air across the regulator (I did).
  2. The filter capacitor is large. It won't fit on any board so bolt it to the case.
  3. You can, of course, add a volt and amp meter.
  4. Since this project operates from 120 VAC, you must include a fuse and build the project in a case.

Related Circuits

6V to 12V Converter, Portable CD Player Adapter For Car, Car Battery Charger, Automatic 12V Lead Acid Battery Charger, Solid State Tesla Coil/High Voltage Generator, 12VDC To 120VAC Inverter, LASER Power Supply, Power Supply, High Current Power Supply, Dual Polarity Power Supply, High Voltage High Current Power Supply, Transformerless Power Supply, Fixed Voltage Power Supply, Voltage Inverter, Voltage Inverter II, Automatic Load Sensing Power Switch

Comments

anonymous
Power Supply
Wednesday, April 30, 2008 7:51:27 AM
Please help me design a power supply that has a voltage range from 0-20 volts and a max current supply of 2 amps, ripple voltage at full load must be 10mVpp and max voltage drop of less than 2 volts at full load. When current is limited be indicated by an LED, a short circuit protection provided and LED indicating when power supply is off/on & 12 volts battery charger with a charging voltage of 13.7 volts and max. current of 2 amps, trickle charging at 11.9 volts. Battery charger must switch off when it is fully charged at 12.5 volts. 3 LEDs must indicate the charging process, tricle charging and when battery is full.
anonymous
Power Supply
Monday, April 28, 2008 2:25:09 PM
Is it possible to use the LM338T ???
hussain
Power Supply
Sunday, April 27, 2008 1:05:27 AM
it's great design and i will use it at my lab but i need varible current the current in this circuit is fixed at 5 amp. what should i have to get varible current??
john
Power Supply
Wednesday, April 23, 2008 10:42:39 PM
please send me a circuit diagrame of regulated power supply that gives 0-30V and 3A current and also with details of components. The maximum voltage drop is 0.5V..please help me..thank you
grego
Power Supply
Saturday, April 19, 2008 2:55:05 AM
I have a couple of 6 amp 13.8 volt DC powersupplies that i would like to turn into variable voltage powersupplies. I will want the high amps even at low voltage. I appreciate any knowledgeable input thank you grego
TUNDE
Power Supply
Thursday, April 17, 2008 3:24:32 PM
please send me a circuit diagrame of power supply that gives 0-30V and 1A current and also with details of components
aLonE
Power Supply
Saturday, April 12, 2008 12:25:38 AM
Hello Sir/Madam, i am new in this things and a lot of things i didn't knew about it. Can you send me a dual output power supply for 240VAC input to 12V and 9V diagram. thank you....
anonymous David
Power Supply
Saturday, April 05, 2008 3:59:19 PM
I know this is simple, but I have not found it. On the ICs like LM317 how do you tell one lead from the other. thanks
Emeg
Power Supply
Saturday, March 29, 2008 3:17:27 PM
pls i help me design a power supply. specification. 10-12v voltage, and 700mA. need it urgent pls
adman
Power Supply
Sunday, March 16, 2008 5:36:15 AM
just get a 7805 voltage regulator, use a small heatsink, it can get hot without heatsink, pin 1 on left is input is where u put 12v + to, middle to - of 12v suply, last pin is 5v
The last 10 comments are currently shown. Show All Comments.

If you would like to leave a comment, you can do so using the form below. Comments can be things like suggestions, successes or failures, improvements, similar circuits, error reports, an answer to a previous commenter's question, or anything in between. However if you would like to ask a question it is suggested that you use the forum instead. The forum provides a more robust environment for discussion.

Important: If you post a technical question here, there is no guarantee it will be answered. All technical questions should be posted to the forum. The owner of this site generally does not answer questions in comments.

All comments are subject to approval before they are displayed here, so your comment will not appear immediately. This is done mainly to prevent spam and other abuse. If you wish to remain anonymous, simply enter "anonymous" for your name and/or email.

Name:
Email:
Subject:
Comments:
Anti Spam Code:
Please enter the exact text shown in the image above into the box below.
Browser cookies must be enabled to comment on circuits.

Privacy Policy

Back To Circuits Page | Mail Me | Search