Traditional Chinese Practical Car Battery Tester: Circuit Design, Parts List & Workshop Prototype Guide
In short: Traditional Chinese Practical Car Battery Tester. 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 2546 words of English technical text, translated and preserved without editing. It is intended for experimental and reference use, not for regulated or commercial certification.
Car battery testerThis tester can detect the current flowing through the car's electrical system without cutting the cable and inserting the ammeter.The principle of this tester is: when any device in the car passes current, there must be current passing through the battery, so there will be a slight voltage drop on the battery connecting cable. By measuring this tiny sum of voltages, you can infer the amount of current flowing through the cable (that is, flowing through the battery). However, this voltage drop is very small and cannot be measured with an ordinary voltmeter. Therefore, an operational amplifier is used here to amplify it to a value that can be measured with an ordinary electric meter.The circuit is shown in Figure 10. It mainly consists of an operational amplifier (4250), a 500μA meter and a double-pole double-throw switch. …
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Lei Cheng
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