Harmonic Distortion Meter (CB26186E)

This complex circuit was found in the 1993 edition of the Electronics Experimenter's Handbook. Most of the components are still common today.

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Digital Voltmeter (CB18102E)
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Time base (CB8933E)
This circuit can generate time base signals from 5 to 1500 Hz. We find it in a documentation about old neon...
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In this circuit the CA3140, an operational amplifier, is used as a comparator with the zener diode...