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Circuits designed by David Johnson, P.E.
Last Updated on:
Tuesday, December 26, 2017 04:15 AM
Master Category List
- Dave's Circuits
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Copyright © David A. Johnson, PE - ALL Rights Reserved.
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- HONEYBEE COUNTER
I designed a circuit similar to this one a long time ago to help a beekeeper count the
number of bees going into or out of a hive. The low power circuit uses a slotted
opto-sensor to detect the passing bees. The circuit advances an electronic counting
module whenever a honeybee passes through the sensor. The device only counts the number
of bees going through the sensor. A different circuit would be needed to count the
number of bees only going out or only coming into the hive.
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- SOLID STATE RELAY REQUIRES ONLY
50uA DRIVE CURRENT
This circuit demands a control current that is 100 times smaller than that needed by a
typical optically isolated solid state relays. It is ideal for battery-powered systems.
Using a combination of a high current TRIAC and a very sensitive low current SCR, the
circuit can control about 600 watts of power to load while providing full isolation and
transient protection.
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