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Circuits designed by David Johnson, P.E.
Last Updated on: Monday, July 11, 2016 01:59 PM

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Sine to Square Wave Circuits

60hz Clock Generator is Line Powered  -  This circuit is connected to the 120vac power line and transfers 60Hz clock pulses to a logic circuit. The optoisolator used provides 5000 volts of isolation between the power line and the logic side of the circuit… [Hobby Circuit designed by David Johnson P.E., 2/23/99]

Line Powered 60hz Clock Generator  -  This circuit is connected to the 120vac power line and transfers 60Hz clock pulses to a logic circuit. The optoisolator used provides 5000 volts of isolation between the power line and the logic side of the circuit… [Circuit by David Johnson P.E., 2/23/99]

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 150… [Hobby Circuit designed by David Johnson P.E., 2/18/06]

Dave's Circuits:  Frequency to Voltage     Period to Voltage    Voltage Converters   
 Voltage to Frequency     
DC to DC Power Supplies   High Voltage Power Supplies    Switchmode Power Supplies     Voltage Controlled Oscillators

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The circuits on this site are designed by David A Johnson - unless otherwise noted.  David A. Johnson & Associates.  All Rights reserved. 
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