【摘要】

When I was a teenager starting out in electronics, I longed to have as much test equipment as possible. At that stage in life, I couldn't afford much beyond a multimeter. I remember seeing plans for a component tester in an electronics magazine. There weren't many hobby electronics magazines back in the '60s, so it was probably Popular Electronics. This tester would provide a "signature" of most passive/active components by placing a small AC voltage across the component and measuring the resulting current. My memory of the circuit is hazy after all these years, but it was trivial: a 6.3 V filament transformer, a current sensing resistor and a few other passive components. However, the catch was that it required an oscilloscope to display the resulting voltage vs. current plot—in other words, the component's signature. By the time I bought an oscilloscope about 10 years later, I had completely forgotten about this testing concept.

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