The Quartz Watch Circuit

The Quartz Watch Circuit

In the previous article, we saw how the electronic circuit in a quartz watch maintains the quartz crystal in oscillation. Most watch crystals vibrate at 32 768 Hz. A quartz watch mechanism with a second hand needs an electrical pulse once every second to operate the stepper motor which drives the train.

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The Quartz Crystal Oscillator

The Quartz Crystal Oscillator

In our article “What is the Stepper Motor in a Quartz Watch?”, I showed you how the Stepper motor converts pulses into rotary motion. The speed of the rotation is determined by the frequency of the current pulses. This is where the quartz crystal oscillator come in to play.

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What is the Stepper Motor in a Quartz Watch?

What is the Stepper Motor in a Quartz Watch?

One of the main components of the quartz watch movement, the stepper motor consists of a permanent magnet rotor, a magnetic stator, and a coil. The stator will carry the magnetic field in a loop inside itself, like a wire carries electricity. Instead of carrying an electrical current, the stator acts as a magnetic circuit.

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Basic Electrical Theory of a Quartz Watch

Basic Electrical Theory of a Quartz Watch

The biggest problem with electricity is that you cannot see it. That is why it can be hard for some people to understand it. For you to understand troubleshooting concepts for quartz watches, understanding the power supply in a quartz watch is essential. To make it easier, I will give you a simple analogy.

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Equalizing Horizontal and Vertical Rates

Equalizing Horizontal and Vertical Rates

It is my opinion that learning to equalize Dial and Pendent Position Rates is one of the hardest skills required by new watchmakers to learn. However, with a little practice this skill will become second nature. You can use this process for balance wheels with or without adjustment screws. However, you really need a timegrapher to measure your results. Although watchmakers were able to adjust watches before the invention of timing machines, it extends the working time needed.

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How to Replace a Crown and Stem on a Wristwatch

How to Replace a Crown and Stem on a Wristwatch

There are basically 3 types of crowns for wristwatches: plain, dustproof and water resistant. They come in a variety of diameters and thickness. The crown screws onto the stem which is the thin shaft that inserts into the watch movement. Watch cases requiring a water-resistant crown will have a pipe coming out of the case through which the stem fits through.

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The 5 types of Jewels used in a Watch.

The 5 types of Jewels used in a Watch.

Jewels are used extensively in vintage and modern watches due to their low friction and low wear characteristics. Low friction is vitally important, especially at the Balance Pivots, to reduce interference to the free motion of the oscillating balance wheel.

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Dealing with Watch Magnetism

Dealing with Watch Magnetism

Steel components in a watch can become magnetized when exposed to a magnetic field, and the most likely source is an owner who unknowingly gets near a permanent magnet or high power electrical cable during normal day to day life.

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