Homemade Circuit Designs Just for You

This site is dedicated to all electronic hobbyists and professionals. Here you can post circuit related queries, have discussions and also publish your own homemade circuit ideas. Get ElectroSchematics on demand.

Monday, January 26, 2015

Calculating Capacitor Current in Transformerless Power Supplies

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

Sunday, January 25, 2015

Simple Water Flow Sensor/Meter Circuit

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

Saturday, January 24, 2015

Barcode Security Lock Circuit - Part2

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 lock or an alarm.

Barcode Security Lock Circuit - Part1

A simple 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.

Friday, January 23, 2015

SMPS Circuit for LCD Monitors

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.

Thursday, January 22, 2015

Simple USB Powered LED Lamp

The post discusses a simple LED desk lamp circuit which may be powered from your PC USB supply.

Button Start Ignition Circuit

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

Wednesday, January 21, 2015

Model Locomotive Infrared Controller Circuit

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.

Monday, January 19, 2015

Using High Watt LEDs with Arduino

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.

Saturday, January 17, 2015

Simple Industrial Delay Timer Circuits

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
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.