Spring Drive
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Spring Drive is a name given to a series of watch movements produced by Epson in Shiojiri. The concept of using a mainspring to power a quartz timing package was first conceived in 1977 by Yoshikazu A
The Seiko Spacewalk is a limited edition Spring Drive model, designed specifically for use in space
The parts of the 5R86 Spring Drive caliber
Phase-locked loop
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A phase-locked loop is a control system that generates an output signal whose phase is fixed relative to the phase of an input signal. Keeping the input and output phase in lockstep also implies a con
Spring Drive
…just as in a mechanical watch. However, the escapement and balance wheel in mechanical watches is replaced by Seiko's Tri-synchro Regulator system, a phase-locked loop wherein a rotor, which Seiko refers to as a "glide wheel", is powered by the mainspring barrel. The glide wheel in turn powers a reference quartz crystal…
ON Semiconductor HC4046A