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Circuits designed by David Johnson, P.E.
Last Updated on: Saturday, December 30, 2017 08:12 AM

List of Dave's Circuit Designs

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Over Temperature Circuits
Circuits Designed by Dave Johnson, P.E. :

Over-Temperature Micro-Power Alarm   -  The circuit is powered for years by a single 3 volt lithium battery.  It sounds an alarm when the temperature exceeds a certain point.  With some minor changes the circuit could also be configured for an under temperature (freeze) alarm.  The circuit uses a . . . Hobby Circuit designed by David Johnson P.E.-June 04, 2000

Micro Power Over-Temperature Alarm  -  The circuit is powered for years by a single 3 volt lithium battery.  It sounds an alarm when the temperature exceeds a certain point.  With some minor changes the circuit could also be configured for an under temperature (freeze) alarm.  The circuit uses a . . . Circuit by David Johnson P.E.-June 04, 2000




 

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