Description. Many fire alarm circuits are presented here,but this time a new circuit using a thermistor and a timer to do the trick. The circuit is as simple…
Description. No big deal here! You can make a decent power amplifier using just three transistors. All components used here can be obtained from your electronic junk box.…
Description. This straight forward circuit will protect electrical appliances from over voltage as well as under voltage. The circuit also produces an alarm when the power supply comes…
Description. A simple sawtooth wave generator circuit for generating a saw tooth wave form using a NE555 IC is given below. The frequency of the wave form can…
Description. Here is a simple variable frequency circuit based on timer NE555. Here NE55 is wired as an astable multivibrator, whose output frequency can be varied by varying…
Description. A variety of humidity tester circuits are available, but this is a circuit which is as simple as possible. Using only a transistor, LED and few resistors,…
Description. A simple scoring game circuit that can be used for all occasions when a dice is needed.The circuit is based on a NE555 timer,a 74LS192 counter,a74LS247 decoder…
A simple Light to Frequency Converter Introduction. Here is the circuit diagram of a effective light to frequency converter circuit that can be used for variety of applications…
Transformerless power supply Circuit Description Here is a low cost and simple circuit that can be used to power up small electronics devices. The power is directly tapped…
Remote control tester Circuit Description This is a simple remote controller tester circuit based on infrared sensor IC TSOP 1738. When the IR waves fall on the sensor…
12 Watts Transistor Amplifier Circuit Description The circuit shown below is not at all expensive as the amplifier contains only an op-amp and four transistors (easily available from…
Dual Tone Train Horn Circuit – Description A dual tone train horn simulator circuit can be made using two NE 555 timers connected in cascade. Here instead of…
What is a sound level meter? A sound level meter is handy equipment used to display sound levels. There are wide ranges of these devices; some show a…
In this project, let’s learn about a simple Stereo Amplifier Circuit. This simple circuit is designed using 4 class B audio amplifier IC’s from Philips – namely TDA1554.…
All audio amplifiers have some mechanism to increase and decrease volume. Most such mechanisms involve mechanical parts like a potentiometer. Here this project is to create an audio…
This is an interesting project where the intensity of a lamp can be controlled by touch. Most lamps only have an on/off switch. They don’t have any regulators…
This is a simple electronic project suitable for everyone. This project is about making a LED bar graph thermometer using two ICs, one for the sensor. What is…
A simple electronic combination lock is designed using IC LS 7220. This circuit can be used to activate a relay for controlling (ON & OFF) any device when…
A simple “tone generator” is a cool circuit that everyone must build in their electronics learning process. We’ve designed this tone generator circuit using 8021 IC, two transistors…
A digital stopwatch is an evergreen project, it can be done at any time no matter how our advanced our world’s technology is because nothing else can replace…
In this project, let’s learn how to make an Inverter – a Simple 40 watts inverter circuit using minimal components. An inverter circuit is often used in DC…
In this project, let’s learn how to make a Simple Proximity Detector or Sensor circuit using minimal components. A proximity detector is a fun project with lots of…
In this project, let’s learn how to make a simple “Long-range FM transmitter” at a low cost using minimal components. As you can see in the diagram, the…