Traditional Chinese Practical Infrared Detector: Circuit Design, Parts List & Workshop Prototype Guide
In short: Traditional Chinese Practical Infrared Detector. 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 3314 words of English technical text, translated and preserved without editing. It is intended for experimental and reference use, not for regulated or commercial certification.
Blind infrared detectorWhen the blind person is 1.5m away from the obstacle, the detector will emit a sound signal to indicate that there is an obstacle ahead. When the obstacle gets closer and closer, the tone of the signal will become higher and higher. The detector is small in size and can be placed in a pocket or hung around the neck, making it very convenient to use.Figure 125The electrical schematic diagram of the detector is shown in Figure 125. The photosensitive diode VD1 (PH302) and the integrated operational amplifier A1 constitute the infrared receiver and discharger, the transistor VT2 (BT33) constitutes the controllable audio frequency oscillator, and the transistors VT3, VT4 and infrared emitting diodes VD2~VD4 constitute the infrared transmitter. Among them, VD2 uses 2C253, and VD4 uses 2CWSS tube. The transistor VT3 (BT33) in the transmitter is a narrow pulse oscillator with a repetition frequency of 1000Hz. After the capacitor C7 is charged to 5~6V, it is quickly discharged through VT3. …
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