PLL FM Demodulator

PLL (Phase Locked Loop) can be used to make a FM demodulator. PLL circuit track the input frequency by controlling a voltage input of a VCO (Voltage-Controlled Oscillator). Since the VCO is controlled to follow the input frequency, then the controlling signal is directly proportional to the modulating signal. Here is the schematic diagram of the cicuit: For this example, […]

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UHF Antenna Booster

Antenna Booster Circuit This antenna signal booster works for TV receiver in UHF band (400-850MHz). This antenna booster gives around 10 to 15 dB amplification.  Here is the schematic diagram of the circuit: This antenna amplifier circuit need special attention for the layout, the transistor circuits should be shielded from the input circuit (as shown with the dashed line), and […]

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