A device that cuts off the signal between a mobile phone and a tower is known as a mobile phone jammer. It achieves this by disrupting with communication by using the same radio frequencies as a cell phone. Several networks including 3G, 4G and even older ones can have calls and texts blocked by this […]
Simple FM Radio Circuit
An FM radio circuit is the electrical mind behind a device that can detect FM radio waves and transform them into audible sound. The functions of radio for FM radio and FM vs. AM are presented below. Radio: A radio is an electrical device that produces audible sound by using radio waves. Using an antenna […]
Simple Voice Recorder and Playback Circuit
Is anyone sick of costly voice recorders? This article explains how to construct a simple one for yourself! It allows to record short messages for loved ones. To record and play it back one needs to simply press two buttons. Note: Compared to other projects this particular project is probably more challenging. What is a […]
Very Low Frequency (VLF) Converter Circuit
This article explains a circuit that can pick up very low radio waves VLF from the air and turn them into sounds to hear. Regular radios often miss these VLF waves because they focus on higher frequencies. This circuit is different it can find these lower waves and convert them so one can listen to […]
Simple Digital Volume Controller Circuit
This circuit describes about a special kind of electronic volume control that uses electronic parts rather than a knob. This kind of circuit uses small computer chips to regulate the loudness whereas regular volume knobs use resistors. This can provide more features and become more accurate. Circuit Working: Parts List: Category Quantity Resistors (All resistors […]
Simple Variable Notch Filter Circuit
This circuit features a special filter that can be tuned to eliminate particular frequencies of sound. One can change it to suit its needs which makes it helpful. This filter is also known as a band reject filter or band stop filter. These filters primarily eliminate or reduce specific noises within a given range. Both […]