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Circuits designed by David Johnson, P.E.
Last Updated on:
Monday, December 25, 2017 02:05 PM
List of Dave's Circuit Designs
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Signal Generators
Crystal Controlled
1KHz Signal Generator
A while back I got an email from a
Discover Circuits visitor. He needed a way to calibrate a RPM display for a big
diesel engine. The engine had a tachometer output which produced 12 pulses per
rotation with an Amplitude of about 5v RMS. The full scale reading on the
engine’s RPM speed display dial was 5,000.
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This translates to a pulse frequency of 1KHz at full scale. To
calibrate the display, he needed an accurate 1KHz signal. The 32KHz crystal
controlled oscillator below performs this function. It uses a CD4060 binary counter,
which has internal inverters configured for a classic crystal oscillator. The Q5
output divides the 32KHz crystal frequency by 32 yielding an output of 1KHz. The
output is AC coupled to the input of the tachometer. |
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Click
on Drawing Below to view PDF version of Schematic |
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