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Electronics Schematics - U

UHF - Ultra High Frequency Circuits

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.

UV light Box - (electronic circuit)

2 Stage Chaotic Colpitts Oscillator for the UHF range - Electronic Circuit design

200MHz 400MHz VOLTAGE controlled Oscillator - If you need a clean emitter coupled logic (ECL) type signal between 200MHz and 400MHz this circuit works fine. It uses four voltage-controlled capacitors to change the frequency. (designed by Dave Johnson)

CMOS Inverter VCO tunes octave to UHF - 11/19/98 EDN-Design Ideas

Rolling code 4-channel UHF remote Control - (electronic circuit)

Two Stage Chaotic Colpitts Oscillator for the UHF range - Electronic Circuit design

UHF TV PreAmplifier - This circuit is designed to work at UHF frequencies in the range 450-800MHz. It has a gain of around 10dB and is suitable for boosting weak TV signals….(schematic)

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