Motional Feed Back Amplifier

Simple Nicad Battery Charger

This simple charger uses a single transistor as a constant current source. The voltage across the pair of 1N4148 diodes biases the base of t... Baca selengkapnya »

High Current Power Supply

Since my page was first posted, I have received a number of emails asking about a high current power supply. I looked around, but couldn... Baca selengkapnya »

Running Message Display Schematics Circuit

Light emitting diodes are advantageous due to their smaller size, low current consumption and catchy colours they emit. Here is a running me... Baca selengkapnya »

Dual Mode Battery Charger Circuit

There are two main types of battery charger – constant voltage and constant current. Both have their advantages and disavantages. For consta... Baca selengkapnya »

Simple FM Microbug

Although the idea has been around for a good while already, it’s still cute: a tiny circuit that you can hide just about anywhere for all so... Baca selengkapnya »

60W Inverter using transistors

Here is the circuit diagram of a fully transistorized inverter that can drive up to 60W loads. Transistors Q1 and Q2 forms a 50Hz astable mu... Baca selengkapnya »

Simple LED Torch

A common problem with small torches is the short life-span both of the batteries and the bulb. The average incandescent torch, for instance,... Baca selengkapnya »

Minimalist Oscilloscope

If you are the proud owner of an old oscilloscope tube, you may be interested in using it once more for its original purpose. All you need a... Baca selengkapnya »

Low-cost Step-down Converter with Wide Input Voltage Range

The circuit described here is mostly aimed at development engineers who are looking for an economical step-down converter which offers a wid... Baca selengkapnya »

Relay Toggle Circuit Using a 555 Timer

This 555 timer circuit below toggles a relay when a button is pressed. Pins 2 and 6, the threshold and trigger inputs, are held at 1/2 the s... Baca selengkapnya »

Wire Tracer (Receiver)

The circuit depicted is the receiver device of a transmitter/receiver combination that will prove extremely handy when tracing the path of e... Baca selengkapnya »

Two-Wire Temperature Sensor

Remote temperature measurements have to be linked by some sort of cable to the relevant test instrument. Normally, this is a three-core cabl... Baca selengkapnya »

Digital Counter with an Interval of Kilometers

The circuit has been designed for a person who loves to jog or walk while measuring the distance that have been covered during the activity.... Baca selengkapnya »

Simple Fire Alarm

Here is a simple circuit which can be used as a Fire Alarm. 3 Volt is enough to operate. There is not much to the circuit. The IC UM66 is co... Baca selengkapnya »

Electronic Door Minder using 555 Timer

This door minder electronic project uses an IR beam to monitor door & passage-ways or any other area. When the IR beam is broken a relay... Baca selengkapnya »

Power Line Modem Circuit for Home Automation Application

Imagine you have a master controller device that control other devices in your house, and you don’t need to install any additional wires to ... Baca selengkapnya »

Simple Video Amplifier

The video amplifier in the diagram is a well-known design. Simple, yet very useful, were it not for the ease with which the transistors can ... Baca selengkapnya »

Simple 4 Channel Video Amplifier using NJM2582

A very simple 4 channel video amplifier electronic circuit project can be designed using NJM2582 ic suitable for video applications with SCA... Baca selengkapnya »

Simple US-Style Siren Circuit

The circuit described here can create three different ‘US-style’ siren sounds: police, ambulance and fire engine. The desired sound can be s... Baca selengkapnya »