Semiconductor LEDs (Light Emitting Diodes) produce light when current flows through them. In comparison to conventional lighting sources, LEDs offer a number of benefits, including high energy efficiency, extended longevity, […]
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LED Night Lamp with Dimmer Circuit
The post explains a simple plug-in type night lamp circuit with delayed switch OFF and dimming facilities. The entire circuit is built using a transformerless power supply which ensures that […]
Random LED Number Generator for Gambling Application
The post explains a random LED number generator circuit consisting of a 4 x 5 LED matrix, numbered from 1 to 20. On pressing a push button these LEDs begin […]
LED Flashlight Circuit using 1.5 V Cell
This LED flashlight circuit is able to power a Luxeon type LED with a single 1.5 V battery. This results in a miniature flashlight that will not run out quickly. […]
LED Light Circuit for Street Vendors, Hawkers, Shopkeepers
In this post we will discuss how to build a very simple, low cost LED lamp with charger. This unit can be used by any street seller, vendor, hawker, to […]
Semiconductor Tester Circuit [LED, Transistor, SCR Tester]
The semiconductor tester circuit explained below performs continuity tests on SCRs, bipolar transistors, and diodes. How the Circuit Works A squarewave oscillator with a frequency of about 350 Hz is produced […]