Transformerless LED Test Circuit diagram - Simple Electronic Project





Diagram of LED Tester circuit diagram


Components Needed for this Project:

You can get the components from any of the sites below:

  1. 225J (400V) Capacitor [See Buy Click Amazon]
  2. 680PF (1KV) Capacitor [See Buy Click Amazon]
  3. 1.2 Ohm 1 watt Resistor [See Buy Click Amazon]
  4. [180krw2_resistor]
  5. 1N4007 Doide [See Buy Click Amazon]

*Please note: These are affiliate links. I may make a commission if you buy the components through these links. I would appreciate your support in this way!

Related Basic Electronic Mini Project Circuit Diagram:


Working Principle




Frequently asked questions

How does an LED tester work?

The LED light characteristics are analyzed by a sensor and the results are returned as a voltage that can then be software-interpreted (or not) to get the LED light intensity, color, correlated color temperature, and other useful information. LED testers can be used in both functional and in-circuit diagram test fixtures.

Why LED is used as a tester?

LED needs less electric current to glow compared to the normal Light. LED does not need to burn filament to produce light on/off. Hence, an LED-based tester is better for testing the conductivity of liquids (like salt solutions) with low electrical System conductivity.

How can I test LED lights?

To check an LED light bulb with a multimeter, you can set the multimeter to the diode test mode. Then, touch the positive (red) probe to the anode of the LED and the negative (black) probe to the cathode. If the LED is functioning properly, the multimeter should display a voltage drop of around 1.5 to 2 volts.

What is LED test current?

LED testing should ideally be performed with a constant current source, typically at 20mA. Final test units for membrane switches frequently use either constant power sources or constant current sources that are limited to well below 20mA.

What is the resistance of LED?

An LED (Light Emitting Diode) is a semiconductor device for 2 termites. It is essentially a P-N junction with a lead attached to each side point. An ideal diode has zero resistance when forward-biased and infinite resistance when reversed-biased system.

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