In this post we will learn how to build a few SCR applications circuits such as battery charger, code oscillator, rain alarm, automatic night lamp etc. An SCR or a […]
Mains Surge Protector Circuit [Computer Power Strip]
The mains surge suppressor filter explained here is actually a type of passive low-pass filter which has a roll-off frequency of 50 Hz. This unit can be efficiently used as […]
Universal Digital, Programmable Timers Circuits
The MC14541B (or 4541) is a low cost IC that occupies a CMOS timer consisting of a 16-stage binary counter, an internal RC-oscillator circuit and an automatic power-up reset circuit, […]
Variable Tone Generator Circuit using Magnet
Wondering how to build a tone generator circuit whose frequency could be changed or adjusted simply by moving a magnet near its sensor coil? This article will explain exactly how […]
Simple Crystal Tester Circuit
The proposed simple crystal tester circuit can be used for accurately testing the operating frequency of any standard crystal, quickly. The figure below shows a crystal checker circuit schematic. In […]
Diode Matching Circuit (Pairing Circuit)
In one of our projects we required several matched silicon diodes for accomplishing a perfectly balanced modulation design. We could easily construct it through a 9 V battery for the […]