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Sequential Timer Circuit using Transistors

In this post we learn to make a simple sequential timer generator circuit which can be used for getting a sequential triggering of a connected load, or can be simply used like a sequential LED bar graph effect generator, using only transistors. The idea was requested by Mr Babusan.  Technical Specifications Is it possible i … Read moreSequential Timer Circuit using Transistors

Simple Scrolling RGB LED Circuit

A simple RGB (Red, Green, Blue) moving or scrolling LED display can be made using a few 4017 ICs. Let’s learn the procedure in detail. Understanding RGB LED RGB LEDs have become quite popular these days due to its three-in-one color feature, and because these can be driven independently using three distinct supply sources. I … Read moreSimple Scrolling RGB LED Circuit

Transformerless Constant Current LED Driver Circuit

In this post we learn how just a single IC MBI6001 can be used as a transformerless constant current LED driver circuit for illuminating a chain of many LED in series. The MBI6001 series of ICs are designed to work with mains AC inputs and convert it into a lower voltage DC output which may … Read moreTransformerless Constant Current LED Driver Circuit

CREE XM-L T6 LED Driver Circuit – Specifications and Practical Application

This article explains how to illuminate a Cree XM-L T6 LED using a current controlled driver circuit while the supply input is from a battery, or in case a mains SMPS is intended as the driver unit. The idea was requested by Mr. Jaco. Technical Specifications Thanks for the great advice and circuits! Have you … Read moreCREE XM-L T6 LED Driver Circuit – Specifications and Practical Application

Make this 2 Pin Bi-Color LED Flasher Circuit

This transformerless mains power supply circuit will allow flashing of a Bi-color 100 LED string, in an alternately switching red, green effect. Using 2-pin Bi-color LEDs The proposed circuit can be used as a Bi-color LED flasher, for generating an alternate red, green flashing effect over a string of 100 LEDs. Bi-color LEDs are available … Read moreMake this 2 Pin Bi-Color LED Flasher Circuit

Up/Down LED Indicator using LM3915

This circuit can be used for moving an LED bar graph in the upward sequence or downward sequence through a couple of push button switches. The concept can be implemented for many other useful applications. Using IC LM3915 In many circuit applications we require a digitally operated control system enabling an upward or downward control … Read moreUp/Down LED Indicator using LM3915

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