Geyser Timer
This geyser timer circuit sounds an alarm after the set timing of 22 minutes when the water is heated up.
Geyser timer circuit
The circuit comprises...
Electronic Fuse
An absolute necessity of every electronics lab is a workbench power supply. The power supply should be regulated and protected against short circuit. Most...
IC 555 Timer Tester
This simple and easy-to-use IC 555 timer tester not only tests the IC 555 timer in all its basic configurations but also tests the...
Zener Value Evaluator
Using this simple Zener value evaluator circuit and a known-value zener diode, you can find the breakdown voltage value of any zener diode. The...
Capacitor Evaluator
Using this circuit and a known-value capacitor, you can find out the value of any capacitor. This circuit can be divided into capacitor evaluator...
Noise Muting FM Receiver
The tuning of a frequency modulated (FM) receiver to a FM radio station frequency involves a lot of ‘hissing’ noise in between the stations,...
BODMAS Rule
BODMAS rule is an acronym to help children to remember the order of operations in calculations.. The term BODMAS stand for bracket, of, division,...
Safety Guard: Time Delay Circuit
When voltages suddenly changes, the change is not smooth, it may go on fluctuating for a short while. This may not be a good...
Shock Warning Circuit
Electrical leakage can cause lethal shocks. But such an unfortunate situation can be avoided with this shock warning system. It uses minimal number of...
DC Changeover System with Battery Protection unit
Emergency lights commonly available in the market come with battery over-charging protection but no discharging protection. Here is a DC changeover system that protects...
Solid-state Relay
The basic function of a relay is to switch on power to a load using an electrically isolated, low-power control signal. Hitherto, electromechanical relays...
Three Colour Display Using Bicolour LEDs
Presented here is a three colour display that uses bi-colour LEDs for display. The circuit is built around two IC CD4017, some transistors & a...
Power Supply Reversal Correcter cum Preventer
When power-supply polarities of an electronic device are accidentally interchanged, the device runs the risk of damage. The danger can be avoided by adding...
Pulse Generator
This pulse generator circuit is very useful while checking/operating counters, stepping relays, etc. It avoids the procedure of setting a switch for the required...
Programmable LED Indicator
In this circuit, IC CD4017 has been used to program a bicolour LED indicator in 10 different modes which can be selected with a single push-button switch.
Automatic Switch-off Battery Charger
Presented here is an automatic switch-off battery charger based on a 555 timer IC. This smart charger automatically switches off when your rechargeable batteries...
Electronic Ignition System for Old Cars
In older carbureted cars, the contact breaker (CB) point ignition system is used to fire the spark plugs. You can convert the ignition system...
Security System Switcher
This is a circuit for a security system that can detect movement of any intruder through a transducer and activate any security device through a relay.