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12V SMPS cicuit diagram

Is it possible that u can send me the circuit diagram of 12V DC,2A and without transformer
It is on urgent basis.

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  • Anonymous Apr 15, 2009

    even iwant the same circuit diagram



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Pg voltage not showing

Posted on Oct 21, 2008


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How the SMPS is working in telecom? What are the functions of SMPS? How it is Converting AC to DC? What are the parts are there inside the SMPS and their function?

smps involves ac to dc and dc-dc switching at high frequency because the type of a transformer in smps is a high frequency transformer and a current gain due to the ferrite do a dc to dc switching you need a mosfet,smps ic e.g uc3845,dc capacitor and some passive components.

Aug 31, 2014 | Eaton Powerware® 9120 UPS System

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I would like to run my 12v led downlights in my caravan from dual voltages, IE: one circuit running 12v directly to the led and the other circuit running via mains 240v through the supplied transformer. I...

I think that you should look into having a professional help you. It is the best way to ensure that the work is being done properly, and I definitely think that everyone should keep that in mind as much as they can. I know that I would be focused on that as much as I possibly could. Hopefully more people will realize this and make it work as much as they possibly can.

Apr 22, 2013 | Microwave Ovens

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Hello\r\nI have a kc-2a camera and would like to know what the pinout is? hope you can help thank you K.V

Its RJ11E. If your system doesn't support RJ11E, you can find a adapter at B&H (that's where I got mien) to connect to a BNC DVR. Make sure the camera has the right Power supply. KC-2A use 15V dc... most camera's I have use 12V.

Aug 11, 2011 | Ultrak Kc552bcn Ccd Cctv Color Security...

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Here is circuit diagram for 24 volt AC call bell system.
Made with off-the-shelf parts from hardware store.


Connect transformer to box with 120Volts
Box with 120Volt ac can be any wall box with receptacle.
Home doorbell system have this kind of box-and-transformer located in attic or basement or utility room ... you can tap into same transformer and use it for both doorbell and call bell.

12V AC and 24V AV transformers are sold in doorbell department of hardware store.
Buy doorbell button in same department.
Buy bell to match voltage of transformer (for example, 24Volt DC bell will not work with AC transformer)
Thermostat wire is sold in electric department of hardware store.

Add a comment if you need more help.

Nov 26, 2010 | Cycling

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Hello, I am trying to fix the monitor LG L1951s that does not power on, I found the 68uF*450V capacitor bad, replaced this one but problem ramains. I have measured most of the componets on the power board...

The 68UF 450 is for the primay smps driving side, are you getting about 160vdc on that cap?
The PWM IC get the kick start DC voltage from the main bridge rectifier thorough a bunch of high resistance resistor to drop the 160vdc down to aboit 15vdc, once the PWM IC start working, one the winding will be the supplying the voltage to the IC to keep it running. If the DC output side detect short cirsuits (drawing too much current) it will go into shutdown, you need to find out if the inverter circuits has short circuits. The 5vdc and the 12~18vdc power supply will be running the minute you plug it in, you can solder in a 12v bulb at the DC output that feeds the inverter circuits (you can solder it directly on the DC filter caps for the 12~18 VDC filter caps of the inverter circuits). See application notes how this IC is used.

No blown MOSFET on the primay side?

Aug 21, 2010 | LG L1951S-SN (Silver, Black) (Black,...

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I need to convert 240v ac to 12v ac/dc without using a transformer.can anyone help me??

By the way, there are some electronic converters that you could use for very low wattage circuits.

If you need further help, I’m available over the phone at

Jul 08, 2009 | Dryers

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Power supply/ no output voltage

Actually i haven't fixed the problem as yet but i did find some info that would help me to fix problem.
I went to google and entered keyword,,, Electronic parts,,there came up a page,,and i went to several manuf sites till i found a replacement transformer,,then i disassembled the power supply and am now waiting for a replacement transformer.

Sep 21, 2008 | Boston Acoustics MicroMedia Computer...

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