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Active Antenna for Medium Wave – Circuit Schematic
Active Antenna for Medium Wave
This circuit is designed to amplify the input from a telescopic whip antenna. The preamplifier is designed to cover the medium waveband from about 550Khz to 165...
One Transistor FM Radio – Circuit Schematic
One Transistor FM Radio
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Coil-less FM Transmitter – Circuit Schematic
Coil-less FM Transmitter
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VHF Audio Video Transmitter – Circuit Schematic
VHF Audio Video Transmitter
The circuit presented here is a simple audio/video transmitter with a range of 3 to 5 metres. The A/V signal source for the circuit may be a VCR, a satellite re...
Simple FM Transmitter – Circuit Schematic
Simple FM Transmitter
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1 Watt C-Class RF Amplifier – Circuit Schematic
1 Watt C-Class RF Amplifier
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Economy short-wave receiver – Circuit Schematic
Economy short-wave receiver
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Long range FM transmitter – Circuit Schematic
Long range FM transmitter
The transmitter circuit described here has an extra RF power amplifier stage, after the oscillator stage, to raise the power output to 200-250 milliwatts. With ...
4 Watt FM Transmitter – Circuit Schematic
4 Watt FM Transmitter
This is a small but quite powerful FM transmitter having three RF stages incorporating an audio preamplifier for better modulation. t has an output power of 4 W...
PLL systems – Circuit Schematic
PLL systems
The phase-locked loop (PLL) helps keep parts of our world orderly. If we turn on an analogue television set, a PLL will keep heads at the top on the screen and ...
RF TV amplifier – Circuit Schematic
RF TV amplifier
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Radio Amplifiers Circuits – Circuit Schematic
Radio Amplifiers Circuits
This is a 1 watt fm amplifier with a good design that can be used to amplify a rf signal in the 88 108 MHz band. It is very sensitive if you use good rf power a...
Radio Field Indicator Circuit – Circuit Schematic
Radio Field Indicator Circuit
A rf field indicator is required to verify power stages and transmitters antennas. With this radio field indicator you can measure radiated energy from ant.....
27MHz CB Amplifier Circuit – Circuit Schematic
27MHz CB Amplifier Circuit
The 10 meters 27MHz CW radio amplifier is equiped with VN66AF transistor produced by Siliconix wich has some advantages: its cheap, great dielectric insulation ...
NBFM 27MHz Transmitter Circuit – Circuit Schematic
NBFM 27MHz Transmitter Circuit
A 27MHz transmitter circuit schematic with MC2833 and 2 FET transistors MPF6660. Using a Motorola MC2833 one-chip FM transmitter, a few support components.....
70MHz RF FM Power Amplifier – Circuit Schematic
70MHz RF FM Power Amplifier
This 70MHz rf power amplifier circuit uses the SD1143 transistor which provides a gain of about 14dB in this design. It uses the fact that a 175MHz device.....
FM Modulator Circuit – Circuit Schematic
FM Modulator Circuit
The FM modulator circuit (frequency modulation) is built with a Motorola MC1648P oscillator. Two varactors, Motorola MV-209 are used to frequency modulate the o...
Wideband Active Antenna Circuit – Circuit Schematic
Wideband Active Antenna Circuit
A 30 to 50 cm whip antenna provides reception from 10 MHz to over 220 MHz. T1 BF981, a dual-gate MOSFET, provides low noise, high-input impedance and high.....
Booster for Cable Radio – Circuit Schematic
Booster for Cable Radio
With the aid of this circuit it is possible to listen, using a portable VHF FM radio, to listen to stations that transmit only your local cable network. Bo.....
Spark Transmitter Circuit – Circuit Schematic
Spark Transmitter Circuit
In 1896, Marconi successfully covered a distance of about 3 km using electromagnetic waves. A little later, he established radio contact across water between La...