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VHF (Very High Frequency) Circuits
Last Updated on: Thursday, June 25, 2015 06:20 AM

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

0A to 2A Current Source -  The LT1995 amplifies the sense resistor drop by 5V/V and subtracts that from VIN, providing an error signal to an LT1880 integrator. The integrated error drives the PMOSFET as required to deliver the commanded current. . . .  [Linear Technology App Note, Mar 31, 2010]


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. . . .  [Designer's name not included]


1.5W VHF Amplifier -  Circuit Schematic only. . .  [Designer's name not included]

20W VHF Linear Amplifier 2SC1946 50 MHz  -  This VHF linear amplifier works for 50 MHz frequency using 2SC1946A with power output about 20 Watt. It needs input 30mW and output 25W for 150 Mhz. It seems can be used for 144 Mhz without modification. There are Power IC and 2SC1946A with low-pass filter on the board. . . .  [by JO1ACW, June 3, 2002]

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 -  The DVM (Digital Volt Meter) also displays the correct polarity sign. There’s neither rocket science nor smoke and mirrors here folks: It’s all done simply with op amps and resistors!. . .  [Prject by Wes Hayward, W7ZOI and Bob Larkin, K7PUA that appears in QST, June 2001]


Balanced Frequency Converter (Suitable for Frequencies up to 50kHz) -  This circuit takes advantage of aliasing that occurs in any time sampled system. The output signal frequency is the difference in frequency between the input signal and the switch sampling rate. A 24KHz input signal sampled at 25KHz will be converted to a 1KHz output signal. In addition by using the LTC1992 fully differential . . .  [Linear Technology App Note, Mar 16th 2010]


Bidirectional Current Source -  The LT1990 is a differential amplifier with integrated precision resistors. The circuit shown is the classic Howland current source, implemented by simply adding a sense resistor. . . .  [Linear Technology App Note, Mar 31, 2010]


Bipolar, Ground Referenced, Single-Ended Signal Interface to Unipolar, Differential Input ADC -  Differential amplifiers are useful for providing the input to a single supply differential ADC from a bipolar ground referenced input source. All of the signal level shifting and gain requirements can be adjusted with external resistors. . . .  [Linear Technology App Note, Mar 16th 2010]


Capabilities of Low-Cost High Voltage RF Power MOSFETs At Hf & Vhf -  Application Note Microsemi-formerly Advanced Power Technology APTB981. . .  [Microsemi Corp]


Convert 2m VHF FM PMR Transceiver Motorola Radius M110 into an Amateur Radio -  . . .  [by Aleksander Stare]


Full-Bridge Load Current Monitor -  The LT1990 is a micropower precision difference amplifier with a very high common mode input voltage range. It has pin selectable gains of 1 or 10. The LT1990 operates over a ±250V common mode voltage range on a ±15V supply. The inputs are fault protected from common mode voltage transients up to ±350V and differential voltages . . .  [Linear Technology App Note, Apr 5th 2010]


Low Noise AC Amplifier with Programmable Gain and Bandwidth -  Two LTC6910 programmable gain amplifiers can be combined to provide independent gain and bandwidth control using two 3 bit digital words. The Gain Control PGA simply varies the circuit gain from 1 to 100. The Bandwidth Control PGA puts signal gain inside the feedback loop of the amplifier. As this gain is increased the effective value of feedback resistor R2 is decreased. This pushes out the upper low pass corner frequency of the ac amplifier. . . .  [Linear Technology App Note, Mar 16th 2010]


Monolithic Software-Programmable-Gain Amplifier -  File contains several designs, please scroll to find this circuit. . . .  [Analog Devices-Analog Dialogue by Krehbiel, John]


Programmable-Gain TIAs Maximize Dynamic Range in Spectroscopy Systems -  Analog Devices-Analog Dialogue. . .  [by Orozco, Luis]


Single Supply Video Line Driver (AC Coupled) -  When AC-coupling video, the waveform dynamics change with respect to the bias point of the amplifi er according to the scene brightness of the video stream. In the worst case, 1VP-P video (composite or Luminance + Sync in Y/C or YPBPR format) can exhibit a varying DC content of 0. 56V, with the dynamic requirement being . . .  [Linear Technology App Note, Mar 25th 2010]


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. . . 


VHF beacon transmitter -  Schematic only, no circuit description. . .  [Designer's name not given]


VHF Converter -  2M to 10M receive converter. . .  [EI9GQ homebrew radio]


VHF transmitter -  . . .  [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. . . . 


Wideband Digitally Programmable Gain Amplifier -  The LTC6910 is a CMOS programmable gain (from 0 to 64) amplifier. The amplifiers provide for a differential input signal and for dc biasing the output into a precise voltage reference based level in a single supply design. . . .  [Linear Technology App Note, Mar 16th 2010]

VHF (Very High Frequency) Circuits

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