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.

Thursday, January 29, 2015

Tuned Infrared (IR) Detector Circuit

 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

Wednesday, January 28, 2015

Simple Shadow Detector Circuit

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

Tuesday, January 27, 2015

Refrigerator Door Open Alarm Circuit

This presented circuit alarm 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.

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.
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.

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