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Thursday, February 11, 2016

How to Build Transformerless Power Supply 12V / 30mA Out of LED Bulb

ElcoHow. - There are two kinds of power supply according using transformer, these are using transformer and not using transformer or called with transformerless power supply. In here we will give you one project of power supply with the title How to Build Transformerless Power Supply 12V / 30mA Out of LED Bulb. In here we will give you electronic circuit, component list, description, how to build, and some software that used to build this power supply.

You also can read: How to Build Transformerless Power Supply 30V 1A using Thyrirstor

Electronic Circuit
Component List
  1. Resistors
  2. Capacitors
  3. Zener Diodes
  4. Diodes
Description

Electronic circuit like in Figure 1 above is Transformerless Power Supply 12V / 30mA Out of LED Bulb circuit. According Instructables site that published this circuit describe that Its actually a hack and a concept of reuse of scrap. I have a 4 LED night bulb and a spare not working adapter. I took out the actual components out of bulb and then replaced it with faulted PCB of adapter and I again got a 12 V adapter which I basically used to power 12V LED strips.

In below circuit diagram you can make one more change. We got two points for input P and N, you can insert a resistor of low value and High wattage like 1/2 Watt to use as current limiter with point N...I have 220 ohms in my circuit.
Skill

To build Transformerless Power Supply 12V / 30mA Out of LED Bulb, you need some skill as follow:
  1. Basic soldering.
  2. Read a basic schematic.
  3. Assembling electronic component
  4. Design PCB layout
  5. Testing voltage and current
  6. Know Thyristor component
Tools and Material

In this project, you must prepare some tools and material that used as the supporting to build Transformerless Power Supply 12V / 30mA Out of LED Bulb as follow:
  1. Tools: soldering iron, cutter, multitester, and Project Board.
  2. Material: Tin, PCB
Software

When you want to realize this Transformerless Power Supply 12V / 30mA Out of LED Bulb circuit into real application, you can build it as like design PCB layout using good software as like: PCB Wizard. 
How to do?

For more information about this project step-by-step you can follow this project of Transformerless Power Supply 12V / 30mA Out of LED Bulb you can read below.
  1. Prepare electronic component listed, material and tools needed.
  2. Firstly you can try this circuit using project board tool.
  3. After you surely with this circuit work properly, now you can begin with design PCB using PCB Wizard.
  4. After designed, now you can make the PCB layout to put these components. You can make PCB by your self or order it according your PCB layout design.
  5. Put all component to the PCB layout and soldering all component.
  6. Now you can test, input and output voltage and current from this circuit. Please read caution below.
Caution
  • Do not put all semiconductor component like Diode.
  • You can use 1M ohms if you dont have 820K ohms.
  • The next circuit is more safe and you can use it for 12V generation also.
  • Do not touch any electrical parts of this transformerless power supply


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