Rf oscillator

The circuit comprises a basic oscillator (above the dashed line) and an automatic keyer (below the dashed line). The unit can be utilized with either a straight hand key or a paddle key for automatic operation. The described circuit integrates...

A voltage-controlled oscillator (VCO) is an electronic oscillator designed to control its oscillation frequency through a voltage input. The oscillation frequency is varied by the applied DC voltage, and modulating signals can also be introduced to the VCO for...

Its frequency depends on the capacitance of the vary cap diode. The center frequency is changed by varying the biasing voltage of the vary cap through the 47K pot. You can use a 75cm telescopic antenna or simply a...

The frequency of oscillation depends on the Rl/Cl time constant, allowing for frequency adjustment by varying Rl. This is a basic circuit. The described circuit operates based on the relationship between resistance (Rl) and capacitance (Cl), which together form a...

The Lamp LI stabilizes the loop gain at higher frequencies, while the limiting action of R2, CRI, and CR2 prevents clipping at low frequencies and increases the frequency adjustment range from approximately 3:1 to over 10:1. Additionally, waveform purity...

The crystal used in the topology of Figure 1 can be either a fundamental AT-CUT or BT-CUT. A BT-CUT crystal has poor frequency stability over temperature compared to an AT-CUT. This topology uses a parallel crystal and not a...