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,…

USB for the Xbox Schematic Circuit Diagram The Xbox is the well-known Microsoft game computer. The fact that the Xbox is based on PC technology should hardly be surprising, since Microsoft specialises in this computer architecture. It’s…

Extended Timer Range for the 555 Schematic Circuit Diagram Anyone who has designed circuits using the 555 timer chip will, at some time have wished that it could be programmed for longer timing periods. Timing periods greater than a…

Protection for Voltage Regulators Schematic Circuit Diagram People often forget that many voltage regulator ICs have an upper limit (usually 35 V) on the input voltage they can handle. That applies primarily to types with a fixed…

Remote Control Blocker Schematic Circuit Diagram This circuit was designed to block signals from infrared remote controls. This will prove very useful if your children have the tendency to switch channels all the time. It is…

Two-Cell LED Torch Schematic Circuit Diagram It sometimes comes as a bit of a shock the first time you need to replace the batteries in an LED torch and find that they are not the usual…

Cable Tester Schematic Circuit Diagram Microcontroller-based circuits for testing cables, sometimes in conjunction with a PC, are easy to use and very flexible. For the hobbyist, however, the complication of such devices is not justified.…

Reflection Light Barrier with Delay Schematic Circuit Diagram This circuit can be used to check, for example, whether the door of a refrigerator has been properly closed. An LED sends out a beam of light, which, if the…

Phantom Supply from Batteries Schematic Circuit Diagram Professional (directional) microphones often require a phantom supply of 48 V. This is fed via the signal lines to the microphone and has to be of a high quality. A…

Converting a DCM Motor Schematic Circuit Diagram We recently bought a train set made by a renowned company and just couldn’t resist looking inside the locomotive. Although it did have an electronic decoder, the DCM motor was…

Negative-Output Switching Regulator Schematic Circuit Diagram There are only a limited number of switching regulators designed to generate neg-ative output voltages. In many cases, it’s thus necessary to use a switching regulator that was actually designed…