Traditional Chinese Practical Ultra-sensitive detector: Circuit Design, Parts List & Workshop Prototype Guide
In short: Traditional Chinese Practical Ultra-sensitive 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 2494 words of English technical text, translated and preserved without editing. It is intended for experimental and reference use, not for regulated or commercial certification.
super sensitive detectorUsing this device, you can hear extremely weak sounds from a distance. Its extremely strong directivity and extremely high sensitivity can pick up the whispers of athletes and coaches on the sports field. It is very interesting to use.How it works:See Figure 109-1 for the circuit. A microphone installed in a special tube receives the sound in a certain direction (the sound in other directions is suppressed) and sends it to the amplifier for amplification. The amplifier consists of two stages. The first stage is composed of one of the four LM324 operational amplifiers, with an amplification of 110 times the gain. The second stage is composed of another operational amplifier, with an amplification of 500 times the gain. Such a high amplification capability is enough to amplify extremely weak sound signals and output them from the headphones. It can be used to hear weak sounds from far away that cannot be directly heard by human ears. alt="168.jpg (53141 bytes)">Figure 109-1 …
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