Traditional Chinese Practical Sun Clock: Circuit Design, Parts List & Workshop Prototype Guide
In short: Traditional Chinese Practical Sun Clock. This entry documents a circuit & prototype taken from Chinese practical-technology literature, written for small-scale makers and home producers. The text below is the full English translation of the original Chinese workshop notes, covering materials and quantities, the step-by-step sequence, and the practical cautions recorded in the source. Roughly 2903 words of English technical text, translated and preserved without editing. It is intended for experimental and reference use, not for regulated or commercial certification.
sun clockGetting up at sunrise is a good living habit. Here is a simple electronic device that can help you maintain this good lifestyle. It is like an ancient sundial. When the sun rises, it can sound an alarm, light an alarm, turn on the radio, or even perform a certain action.The circuit of this device is shown in Figure 19. It consists of a photovoltaic cell (or photosensitive transistor), a PNP transistor, a one-way silicon controlled thyristor (SCR), a potentiometer and a 10kΩ resistor.When there is no light or the light is very weak, the resistance of the photocell is very large, the bias voltage of the PNP tube (2N3906) is extremely small and cannot be turned on. There is no voltage drop on the 10kΩ resistor. There is no trigger voltage on the control electrode of the unidirectional controllable tube SCR. The thyristor is blocked, so there is no current through the load and no response. …
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