10
Frequency-Measuring Circuits
The sources of the following circuits are contained in the Sources section, which begins on page 217. The figure number in the box of each circuit correlates to the source entry in the Sources section.
POWER-LINE FREQUENCY METER
Fig. 10-1 73 AMATEUR RADIO
The meter will indicate the frequency from a power generator. Incoming sine waves are converted to square waves by the 100 kΩ resistor and by the 6.8-V zener. The square wave is differentiated by ...
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