Category Archives: Test and Measurement

Audio Signal Injector and Tracer in One Circuit

Posted on May 28, 2009 by Adam
audio-signal-injector-tracer

If you are building or troubleshooting audio circuits, both audio signal injector and audio tracer is important tools. tracing audio signal means tapping a signal at certain point, and check if the signal is exist.  Here is the schematic diagram … Continue reading →

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Simple pH Meter Circuit, A Low Cost Adapter for Your Digital Voltmeter

Posted on May 20, 2009 by Adam
ph-meter-circuit

What is A pH Meter? A pH meter is actually a precise voltmeter  that measures the generated voltage of a pH electrodes. The requirement of such meter is high input impedance and has the gain of  voltage-pH conversion. The standard … Continue reading →

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Crystal Tester

Posted on May 18, 2009 by Adam
crystal-tester

Quartz crystal tester is needed if you want to know whether the crystal is good or bad (broken).  This crystal tester gives LED light indicator. If the crystal under test is good, the LED indicator will light, and stay off … Continue reading →

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