A tuned radio frequency receiver (or TRF receiver) is a form of radio receiver which is made using a number of tuned radio frequency (RF) amplifier stages accompanied by a detector (demodulator) circuit to draw out the audio signal, along with an audio frequency amplifier for amplifying the extracted audio into a loudspeaker. This kind […]
Radio
Crystal Radio Sets with Amplifier Circuit
A crystal radio receiver, often known as a crystal set, is a simplest form of radio receiver that was widely used in the initial periods of radio. A crystal radio set does not require any external power supply to operate. Instead, it simply makes sound using the energy of the radio signals that is received. […]
Make this Radio Repeater Circuit at Home
In this post I have explained a simple radio repeater circuit which can be built by any new hobbyist or a radio amateur for communicating over long distances using ordinary transmitters and radio receivers. In this article we are going to see what radio repeater is, how it works and how to build one in […]
Remote Control Circuit Using FM Radio
In this post I have explained how to build a simple FM remote control circuit for toggling small AC loads such as lamps, fans etc using an ordinary FM transmitter circuit and a modified FM radio circuit. This remote control system enables the user to get an ON/OFF control on any desired appliance, by simply […]
2 Meter Ham Radio Transmitter Circuit
In this post I have explained the complete building procedure of a 2-meter amateur ham radio transmitter circuit, using ordinary electronic components and ordinary test equipment. What is 2-Meter VHF Radio The 2-meter amateur radio band is a section of the VHF radio spectrum, which includes frequencies ranging from 144 MHz to 148 MHz in […]
Transmitter Receiver Circuit for 80-meter Ham Radio
This tiny and simple transmitter, receiver set will allow you to communicate over 100 of miles across the world, by tuning to 80-meter amateur ham radio stations. What is 80-meter Band The 80-meter uses 3.5 MHz frequency band for radio communications, which gets the permissions under amateur radio use Between 3.5 to 4.0 MHz in […]