Variable center frequency filter for frequency modulation...

Variable cmos vernier delay

Variable coupling if amplifier

Variable delay device

Variable delay device for electrical signals

Variable digital frequency generator with value storage

Variable digital signal processing circuit

Variable duty cycle control generator

Variable duty cycle window detecting analog to digital...

Variable emitter degeneration gain-controlled amplifier

Variable emphasis circuit

Variable filament inductors

Variable filter

Variable filter circuit

Variable frequency logic clock

Variable frequency oscillating circuit

Variable frequency oscillator

Variable frequency oscillator with stable center frequency

Variable frequency pulse generating circuit

Variable frequency relaxation oscillators