Voice coil driven variable capacitor This device in from a Second World War radio altimeter, the APN-1. It is basically a speaker voice coil that drives one plate of a variable capacitor to produce a sweep frequency gene

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• Electronic test equipment
• Oscillators
• Wobbulator
• Capacitors
• Laboratory equipment
• Sweep generator
• Tuner
• Variable capacitor
• Loudspeaker
• Electronic engineering
• Technology
• Electrical engineering