Programmable Musical Organ Circuit

In this post we are going to construct a musical organ circuit whose musical tone can be programmed by adjusting 10 pre-sent resistors in the circuit and the speed of the music played can also be controlled. The proposed circuit is based on IC 555 and IC 4017; it has two IC 555s and one […]

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Simple Clap Switch Circuit using Transistors (Tested)

Below is a simple clap switch circuit for electronics amateurs which could turn on & off a bulb, Fan, Radio and so on., through the noise of clap. The sound of clap will be captured by a tiny mic which is indicated through a biasing resistor R1 within the circuit. The mic transforms sound influx […]

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How to Make a Sequential Delay Timer Circuit

Within this publish we figure out how to create a basic sequential delay timer generator circuit that are available for obtaining a sequential initiating of a linked load, or may be basically utilized similar to a sequential LED bar graph impact generator, making use of only transistors. The Design The offered 2 LED sequential delay […]

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Simple Latch Circuit using Transistors

All-purpose Latch-up Switch Normally a latch-up switch needs either a relay, an SCR trigger circuit or some integrated circuit. The simple latch- up switch described here uses only a pair of general-purpose transistors. Initially. when there is no input. transistors Tl and T2 are cut-off and the output voltage is zero. Once DC voltage is […]

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Automatic Signalling Circuit for Model Trains

Automatic railway signals are meant for efficient movement of trains, without colliding. The track is divided into blocks or sections. At the entry of each section there is a signal. The signal consists of three lights-red, amber and green in colour. Red light means the train should stop totally, because another train is in the […]

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Simple Light Activated Switch Circuit

The light activated switch circuit works on a very basic principle, that of amplification of the current produced by a photo-transistor when light impinges upon it. The current is amplified by op-amp 741 that drives T2, energising a relay. The circuit shown can be used to activate a relay with a conventional torch up to […]

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Simplest Homemade Electric Guitar

Do you wish to convert your own Hawaian guitar into a simple electronic guitar ?Well here’s an excellent idea for you. It will cost you about $1 only. , You will need only a door-bell electromagnet (230V AC) and a transistor receiver or a standard audio amplifier. Fix the electromagnet somewhere near the wires of […]

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Keyboard Beep Circuit

There are many situations where an audible indication for a button pressed would be very useful. Two particular cases are: a morse key, where it is otherwise impossible to know that the key has been operated, and an ASCII keyboard. This circuit is based on a 7555 timer IC (the CMOS version of the well […]

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How to Build a DIY Contact MIC Circuit

Contact mics enable you to feel uncommon sounds when connected to numerous surfaces.It also Generate sound when voltage is used on it.With the guide of a fundamental Pre-amp circuit it may also serve to Electrify an Acoustic Guitar, where amplification is essential. A piezoelectric disk produces a voltage when deformed. Piezo elements are useful when […]

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How to Build a Spy Circuits – FM Bug Transmitters

All the spy circuits in this article are considerably strong, difficult to find in their unseen positions, and outfitted for grasping even the weakest of whispers in the vicinity. Furthermore the designs are designed for creating the selected facts upto radial distances going above 2 kms. The above amazing features have compelled the legal authorities […]

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