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VHF (Very High Frequency) Circuits
Last Updated on: Monday, March 09, 2015 04:12 AM

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

1.3W VHF RF Amplifier 2SC1970 88-108 MHz -  This RF power amplifier is based on the transistor 2SC1970 and 2N4427. The output power is about 1.3W and the input driving power is 30-50mW. It will still get your RF signal quit far and I advice you to use a good 50 ohm resistor as dummy load. To tune this amplifier you can either use a power meter/wattmeter, SWR unit or you can do using a RF field meter.
1.5W VHF Amplifier -  This project will explain the basic function of a class-C transmitter. I will explain how to dimension a transmitter and the purpose of the different components. I will also explain how you can build a 1.5W PA transmitter. The project will include PCB,....(schematic design added 03/08)
30 Watt VHF Amplifier -  The 30 watt amplifier schematic shown below provides an appropriate power boost with an input of 4 watt up to 6 watts. The circuit is designed to cover 88-108MHz FM Broadcast Band. However, the circuit is very stable at my place and provides a clean-output through seven (7) element Butter-worth low-pass filter.... [Circuit designed by David Celestin]
Advanced VHF Power Meter -  (circuit / schematic design added 6/06)

Capabilities Of Low-Cost High Voltage RF Power MOSFETs At Hf & Vhf -  Application Note Microsemi-formerly Advanced Power Technology APTB981  ( app note added 05/07)
Convert 2m VHF FM PMR Transceiver Motorola Radius M110 into an Amateur Radio -  (electronic circuit added 7/03)
VHF Audio Video Transmitter -  Build your own LC Meter and start making your own coils and inductors.  This LC Meter allows to measure incredibly small inductances making it perfect tool for…(design added 08/08/08)
VHF beacon transmitter -  Schematic only, no circuit description
VHF transmitter -  ….(Circuit design added 04/09) [Peter Jakab, Electrical Engineer, Engineer of Informatics]
VHF/UHF Prescaler -  The recommended Prescaler is ridiculously simple. It consists of just one IC, a TV tuner prescaler, the Philips SAB6456A, which can divide by 64 or by 256.  This chip is widely available both new and in the surplus market at much lower prices than conventional divide by 10 prescalers.
VHF/UHF TV Modulator -  Simple oscillator that generates a frequency in the VHF or UHF region. The oscillator is modulated with the video signal and the modulated carrier wave thus generated is fed into the TV set's aerial input via a cable. Then all that remains to do is tune the TV to the correct frequency.

VHF (Very High Frequency) Circuits

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