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Vackář describes a VFO design using this circuit that covers a modest frequency range of 1:1.17. [14] Vackář then describes a variation of the Radioslavia circuit that can cover a frequency range of 1:2.5 [15] or even 1:3. [16] This circuit tries to compensate for some variation in Q over the useful range of the VCO. [17]
For low-frequency VCOs, other methods of varying the frequency (such as altering the charging rate of a capacitor by means of a voltage-controlled current source) are used (see function generator). The frequency of a ring oscillator is controlled by varying either the supply voltage, the current available to each inverter stage, or the ...
A variable-frequency transformer is a doubly fed electric machine resembling a vertical shaft hydroelectric generator with a three-phase wound rotor, connected by slip rings to one external power circuit. The stator is connected to the other. With no applied torque, the shaft rotates due to the difference in frequency between the networks ...
A simple analog PLL is an electronic circuit consisting of a variable frequency oscillator and a phase detector in a feedback loop (Figure 1). The oscillator generates a periodic signal V o with frequency proportional to an applied voltage, hence the term voltage-controlled oscillator (VCO).
A signal generator is one of a class of electronic devices that generates electrical signals with set properties of amplitude, frequency, and wave shape. These generated signals are used as a stimulus for electronic measurements, typically used in designing, testing, troubleshooting, and repairing electronic or electroacoustic devices, though it often has artistic uses as well.
The other winding (traditionally called the field, but here both windings can be outputs) is connected to 3-phase AC power at variable frequency. This input power is adjusted in frequency and phase to compensate for changes in speed of the turbine. [4] Adjusting the frequency and phase requires an AC to DC to AC converter.
Meacham's circuit included a quartz crystal oscillator and a lamp in a Wheatstone bridge. In Meacham's circuit, the frequency determining components are in the negative feed back branch of the bridge and the gain controlling elements are in the positive feed back branch. The crystal, Z 4, operates in series resonance. As such it minimizes the ...
Small variable-frequency drive Chassis of above VFD (cover removed). A variable-frequency drive (VFD, or adjustable-frequency drive, adjustable-speed drive, variable-speed drive, AC drive, micro drive, inverter drive, variable voltage variable frequency drive, or drive) is a type of AC motor drive (system incorporating a motor) that controls speed and torque by varying the frequency of the ...
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