Readers are advised to proceed with the construction of the presented circuits only after understanding the concepts from the core. Not adhering to this can lead to failures and frustrations.

Search This Blog


Monday, April 21, 2014

Ozone Water/Air Sterilizer Circuit

We are all familiar with thundering and lightning during stormy weathers and know how the effect is responsible of producing a lot of ozone and negative ions in the atmosphere. The same concept has been employed in the proposed water and air sterilizer circuit.

Thursday, April 17, 2014

48V Solar Battery Charger Circuit with High/Low Cut-off

The post discusses a 48V solar battery charger circuit with built-in lower and higher charge cut-off feature. The thresholds are adjustable through individual presets. The idea was requested by Mr. Deepak.

Wednesday, April 16, 2014

Non-Contact Current Sensor Circuit Using Hall-Effect IC

When it comes to sensing current (Amps) linear Hall-effect devices are the best and the most accurate. These devices can sense and measure current right from a few amps to many thousands. Moreover it allows the measurements to be done externally without necessitating a physical contact with the conductor.

Tuesday, April 15, 2014

MJ11021(PNP) MJ11022 (NPN) High Voltage Transistor Datasheet - Complimentary Pair

MJ11021(PNP) MJ11022 (NPN) are high voltage complimentary pair Darlington transistors suitable for all applications that involve high voltage high current such as in motor control, inverters, etc.

Tuesday, April 8, 2014

Li-ion Emergency Light Circuit with Over charge and Low Battery Cut off Features

The post presents a simple Li-ion automatic emergency light circuit with added features such as an over and under battery voltage shut off circuitry. The Circuit was requested by Mr. Saeed Abu and Y0f4N.

Wednesday, April 2, 2014

Simplest 100 Watt LED Bulb Circuit

The article discusses a very simple 100 watt LED bulb circuit using a few high voltage capacitors. The entire circuit could be built at a cost less than $25.

Tuesday, April 1, 2014

Simple Satellite Signal Strength Meter Circuit for Aligning Dish Antennas

Here we learn how to make a simple inexpensive satellite signal strength meter which can be used for aligning dish antennas with local satellites in order to achieve the correct positioning and maximum signal strength from the antenna. 

Monday, March 31, 2014

Electronic Load Controller Circuit Using Triac Dimmer Phase Chopping Concept

In the previous post we learned an effective electronic load controller circuit using a sequential multiple dummy load switcher concept, here we discuss a much simpler design of the same using a triac dimmer concept and with a single load.

Electronic Load Controller (ELC) Circuit for Windmill Generators

The articles explains a home-built ELC circuit which may be used for regulating the speed and frequency of a windmill generator unit. The idea was requested by Mr. Nilesh Patil.

Sunday, March 30, 2014

UPS Relay Changeover Circuit with Zero crossing Detector

The following post explains a simple relay changeover circuit with zero crossing detector which may be used in inverter or UPS changeover applications, for switching-over the output from AC mains to inverter mains during inappropriate voltage conditions. The idea was requested by Mr. Deepak.