555 timer based projects list

10-Watt Audio Amplifier using LM1875 Schematic Circuit Diagram Here is a simple 10-watt audio amplifier using IC LM1875. The IC has five pins and can deliver a maximum of 18-watt output power depending upon the supply voltage and…

SIMPLE ELECTRONIC REFLEX GAME SCHEMATIC CIRCUIT DIAGRAM The circuit is powered by a 9 volt battery installed on the cd4093 schmitt trigger integrated circuit with an integrated and few passive components installed. For beginners, the game is a…

Keypad Encoder IC with Serial Output Schematic Circuit Diagram The EDE1144 Keypad Encoder IC from E•Lab Digital Engineering (www.elabinc.com) is designed to interface a matrix-type 4 row × 4 column (16-key or less) keypad to a microcontroller or other…

SW Converter for Digital AM Car Radio Schematic Circuit Diagram This circuit is purposely presented with many loose ends (not literally, of course) to stimulate experimenting with RF circuitry at a small outlay. Looking at the circuit diagram you may…

Alternating Blinker Schematic Circuit Diagram The circuit represents a general-purpose astable multivibrator that alternatively energizes two heavy loads via a relay (in this case, the loads are 12-V incandescent lamps). In contrast to an ‘analogue’…

Simple Remote Control Tester Schematic Circuit Diagram Nearly always when a remote control doesn’t work, the underlying problem is elementary: the unit does not emit light. The cause may be dry solder joints, defective LEDs etc., but…

NUMERICAL CIRCUITS LABORATORY EXPERIMENTS SCHEMATIC CIRCUIT DIAGRAM Introduction to RTL, TTL and CMOS Gates Resistance and Transistor (RTL) Gate Experiment, Introduction and Characteristics of TTL and CMOS Gates, Performing Boolean Functions with Minimum Gates SCHMITT TRIGGERING CIRCUIT Coder, Decoder,…

Tiny Compass Schematic Circuit Diagram A compass is an invaluable orientation aid, especially when you’re traveling by foot or bicycle. Some smartphones and navigation systems do not have built-in compasses, so they can determine direction…

Universal Measurement Amplifier/Attenuator Schematic Circuit Diagram A computer is very suitable for making (audio) measurements thanks to the sound card that is usually built in. Unfortunately, the audio input on laptops is usually too sensitive to…

Smoke Alarm Power Supply Schematic Circuit Diagram Smoke alarms are extremely useful devices, but they suffer from one significant disadvantage, which is that they’re battery powered. This can’t really be avoided since a smoke alarm should still…

TAPIR Sniffs it Out Schematic Circuit Diagram Why build an electrosmog (‘E-smog’) detector? The answer is quite simple. More and more of our everyday objects are based on some sort of electrical ‘core’: your toothbrush, camera, cellphone,…

Voltage Inverter using a 555 Schematic Circuit Diagram In many circuits, we need to generate an internal adjustable voltage. This circuit shows how it is possible to use a trusty old NE555 timer IC and a bit of…

Economical 7-segment Display Schematic Circuit Diagram Current consumption is always an important consideration when designing battery-powered devices. This circuit shows how a seven-segment display can be driven by a microcontroller in a way ideally suited for…

LED Garland Controller Schematic Circuit Diagram These days you can buy various types of LED garlands at a reasonable price. With these, you can illuminate various objects indoors or outdoors with interesting lighting effects. When you…

One-transistor Voltage Converter Schematic Circuit Diagram Taking apart a solar-powered lamp revealed a single-transistor voltage converter circuit that allowed an LED to be driven from a 1.2 V cell. The l/h diagram shows the circuit (with…

Battery Maintainer Schematic Circuit Diagram The author found that a long-neglected gel battery in a hand-held vacuum cleaner had gone high-resistance. It took some effort to make it usable again, by alternately applying voltages of…

Mini-Mute Schematic Circuit Diagram This handy circuit does the job for you. It converts your coffee table into one big button: if you rap on the table, the TV sound is muted right away.…