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A crystal oscillator is an electronic circuit that uses a quartz crystal to produce a precise and stable frequency reference. This article covers crystal operation, equivalent circuit models, resonance, load capacitance, oscillator topologies, stability, aging, and design practices.

Crystal Oscillator: Fundamentals, Models, and Design Guidelines

A voltage reference is a precision circuit that delivers a stable output voltage independent of temperature, power supply, and load variations. This article covers key reference technologies, specifications, selection criteria, PCB design, and applications in ADCs, DACs, and calibration systems.

Voltage Reference: A Survey for Precision Engineers

This article details electric actuators — explaining theory, construction, motor topologies, transmission trade offs, feedback architectures, selection methodology, applications, comparisons with fluid power, maintenance and standards.

Electric Actuator: Comprehensive Engineering Guide