4 LED Temperature Indicator Circuit

Jan 31, 2015

The 4 LED temperature indicator circuit discussed here is very useful for getting a visual information regarding the state of temperature which is to be monitored.

Set Reset Circuit using IC 555

In this post we learn a simple IC 555 set/reset application circuit for activating or deactivating a relay alternately.

Logic Level Indicator Circuit

This logic detector probe circuit can be very useful device for those who may want to measure the logic levels of digital circuits frequently. Being an IC based circuit, it's implemented in CMOS technology, its aplication is more dedicated to test circuits using the same technology.

Car Battery Voltage Monitor Circuit

This simple 4 LED car voltmeter is designed to allow us to monitor the voltage level of the battery of our car at any instant, continuously. 

Blinking 3 LEDs (R,G,B) Sequentially Using Arduino

Jan 30, 2015

The post explains how to run or blink three LEDs in sequence using Arduino. The post was written and submitted by: Jack Franko

Tuned Infrared (IR) Detector Circuit

Jan 29, 2015

 The article is a continuation of the earlier post where we tried to find a solution for creating unique infrared IDs for trains in a model locomotive system. Here we try to understand the application in detail and learn how it may be possible to successfully implement the idea using tuned IR detector circuits. The idea was requested by Mr. Henrik

Simple Shadow Detector Circuit

Jan 28, 2015

This shadow detector circuit operates using two LDRs and effectively detects the difference between the light levels and triggers a loud audible warning siren.

Cyclist's Safety Light Circuit

A simple flashing bicycle safety light circuit has been discussed in the following article

Refrigerator Door Open Alarm Circuit

Jan 27, 2015

This presented refrigerator door open alarm circuit which alerts you after a period of time whenever your refrigerator door is left open.

0 to 99 Digital Pulse Counter Circuit

The proposed 00-99 digital counter becomes very handy in places where you need to keep the people organized in some specified order.

Temperature Triggered DC Fan Speed Controller Circuit

This fan speed controller works by sensing the temperature of the engine and is accordingly used for the triggering. As the temperature increases so does the speed of the fan motor and vice versa.

Temperature to Voltage Converter Circuit

 The post explains a simple temperature to voltage converter circuit using IC LM317. The idea was requested by one of the dedicated members of this blog.

Calculating Capacitor Current in Transformerless Power Supplies

Jan 26, 2015

You may have studied countless transformerless power supplies in this blog and in the web, however calculating the crucial mains capacitor current in such circuits has always remained an issue for the many constructors.

Simple Water Flow Sensor/Meter Circuit

Jan 25, 2015

The post explains a simple water flow meter/sensor circuit using hall effect sensor and a pulse counter circuit.

Barcode Security Lock Circuit - Part2

Jan 24, 2015

In the previous article we learned about a simple barcode sensor circuit, here we'll study how the sensed pulses can be transformed for getting unique sets of high low outputs from the IC 4033 in response to different barcodes patterns. This unique results can be then used for activating a barcode security lock circuit or an alarm.

Barcode Security Lock Circuit - Part1

A simple barcode security lock circuit or barcode scanner circuit is explained in the following article using just a handful of ordinary components such as an opamp, an LDR and an laser light.

SMPS Circuit for LCD Monitors

Jan 23, 2015

This power supply functions with a broad input voltage range from 90 to 265 V AC and produces a dual output in the form of 5 V / 2.5 A, and 14.5 V / 1 A.

Button Start Ignition Circuit

Jan 22, 2015

The post discusses a simple automatic ignition system which is initiated with a push button operation. The idea was requested by Mr. Andreas.

Model Locomotive Infrared Controller Circuit

Jan 21, 2015

The article discusses a model locomotive controller circuit using uniquely set IR beams for different locomotives allowing unique identification signals and controls for the engines. The idea was requested by Mr. Henrik.

Using High Watt LEDs with Arduino

Jan 19, 2015

The post explains the method of incorporating high watt LEDs with Arduino through external high voltage supplies. The question was put forth by Mr. Cole.

Simple Industrial Delay Timer Circuits

Jan 17, 2015

In this post we'll study two simple externally triggered timer circuits for two different application needs, the ideas were requested by Mr. Alan and Ms.Stevanie

Simple RGB LED Controller Circuit

Jan 8, 2015

In this post we learn how to make a simple RGB (Red, Green, Blue) LED controller circuit which may be designated to flash a group of RGB LEDs with a particular sequencing pattern. The idea was requested by Mr. Navdeep.

High Power Industrial Mains Surge Suppressor Explored

Jan 3, 2015

The post explains a high energy surge suppressor circuit for suppressing high current mains surges in industrial electrical.

Reverse Forward Motor Timer Circuit for Incubator Mechanism

In this post we learn a reverse forward timer circuit for operating an incubator motor mechanism with a preferred set of movements. The idea was requested by Mr. Anwar

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