Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Newbie needs to turn this 220V LED Bulb into a 120V Bulb

Status
Not open for further replies.
J

johnnyoh

Newbie level 2
Newbie level 2
Joined
May 5, 2011
Messages
2
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,293
I am a complete novice at electronics but like to fiddle. Any way to make this 220V bulb work on 120V or can I just use the LED Panel by itself with a 12V power somehow by cutting the wires to the board and adding a resistor. It has 145 LED bulbs. Pics attached thanks. circuitled.jpg5.jpg
 

Maybe if you draw some king of schematic with the components but in general it is not a good idea to modify circuits that work with the mains voltage unless you are sure of what you are doing and can make it work safely because these are hazardous voltages.

The rough picture is that there is a diode bridge with a capacitor that rectifies the AC voltage to a DC.
The leds are in series but I see three red cables so there are probably in three threads each one working with the rectified voltage.
There are a couple of resistors that I don't know how they are connected.

Alex
 

I would expect an even number of LEDs, because two strings are connected in parallel. To change the device for 120V, the LED circuit has to be changed to 4 parallel strings (e.g. 4x36), the 2.2 µF series capacitor value has to be doubled and the resistors should be adjusted. Possibly the filter capacitor should be increased, too. I guess, it's more comfortable to buy a 120V device.

For 12V DC, you would want to make a new wiring PCB.

P.S.: My guess for the circuit, some values to fill in.
 
Last edited:
The 2.2uF cap is the big fat one marked 225, 4.7uF is the nearest size available, you need one class x or class y or one rated at least 400v.
 
thank you all so much for the guidance. It is much appreciated.
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top