Traditional Chinese Practical Drowsy Wake-Up Device: Circuit Design, Parts List & Workshop Prototype Guide
In short: Traditional Chinese Practical Drowsy Wake-Up Device. 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 3840 words of English technical text, translated and preserved without editing. It is intended for experimental and reference use, not for regulated or commercial certification.
Sleepy wake-up callerPeople who have the habit of dozing off are often beyond their control. People often fall asleep in situations where they shouldn't doze off, which may cause them to miss work or cause accidents. But as long as you use the sleep wake-up device shown in Figure 220-1, when sleep comes, it will make a loud "beep" sound. Wake up those who doze off, especially suitable for long-distance bus drivers, telephone operators, warehouse managers and anyone who likes to doze off at work. alt="308.jpg (35230 bytes)">Figure 220-1The principle of the sleep waker is very simple. It consists of a miniature low-frequency oscillator, a start switch and an earplug machine, as shown in Figure 220-1. Normally, when a person sits upright, the head is vertical (the position of the nail), and the salt water in the start switch of the earplug machine worn on the ear is in a horizontal state, which will not turn on the circuit of the low-frequency oscillator, and the earplug machine will have no sound. When dozing off, the person's head will involuntarily hang down (at the position of B) and the conductive salt water tilts, thus connecting the two electrodes. The oscillator works immediately, causing the earbud machine to emit a loud low-frequency oscillating sound to wake people up. As long as the person sits or stands upright, the oscillator will stop working and the earbud machine will have no sound. The circuit schematic diagram of the low-frequency oscillator is shown in Figure 220-2. Transistors VT1 (3DG6) and VT2 (3AX31) form a simple two-tube audio oscillation circuit. Positive feedback is introduced by capacitor C1 to form oscillation, and the frequency can be determined by adjusting the value of resistor R1. The A and B terminals in the circuit are connected to the lead wire of the start switch. When the switch is closed, terminals A and B are connected, the oscillator starts working immediately, and the earbud machine emits a loud "beep" audio oscillation sound. When the start switch is turned off, the oscillator stops working and the earbud machine is silent. …
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Lei Cheng
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