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Voltage Comparator Circuits
Last Updated on:
Friday, March 12, 2010 12:07 PM
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| Circuits Designed by Dave
Johnson, P.E.: |
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40KHz Ultrasound Receiver
A X100 transistor amplifier is followed by a zero cross detector circuit, using a
voltage comparator. The output is a TTL logic signal, corresponding to the
received 40KHz signal. (added 7/06)
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PRECISION ULTRA LOWER POWER OSCILLATOR
This circuit works much like the classic 555 timer, but draws only about 1.5
microamps from a 3 volt battery. It is highly stable under varying temperature and
supply voltages.
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Wide Band Zero Cross Detector
This circuit was designed to convert a low amplitude 40KHz signal into a clean
square wave signal. It will work with inputs as small as 5mv peak-to-peak or
as large as 3 volts peak to peak. The input frequency can range from a few
kilohertz to about 150KHz.
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Links to electronic circuits,
electronic schematics, designs for engineers, hobbyists, students & inventors:
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