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

Master Category List - Dave's Circuits

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Power Line Circuits

5v Line-Powered Isolated Supply  -  Often a circuit requires a 5v DC supply to power some logic circuits.  The conventional method is to use an AC wall adapter.  But, many systems, which bring AC power onto a circuit board, need a small AC to DC power supply right on the circuit board.  The . . . [Hobby Circuit designed by Dave Johnson P.E.,  07/15/09]


Appliance Unplugged Alarm  -  I received a call from an administrator at a large prison.  He told me that he was having problems with inmates who keep unplugging refrigerators, vending machines and microwave ovens in a commons area.  He wanted a battery-powered device, which could be mounted to the outside of the power cord of an appliance. . . . [Hobby Circuit designed by David Johnson P.E.,  04/25/10]


Miniature 5v Line Powered Isolated Supply  -  Often a circuit requires a 5v DC supply to power some logic circuits.  The conventional method is to use an AC wall adapter.  But, many systems, which bring AC power onto a circuit board, need a small AC to DC power supply right on the circuit board.  The . . . [Circuit by David Johnson P.E.,  07/15/09]


Modified Cheap Solar LED Path Light  -  Modification of a typical solar path light with a standard 1000ma-hour NiMH AAA cell.  I then replaced the small 4 cell solar panel with a larger 4 cell unit, which produced 150ma in the sun.  Next, I simply changed the 470uH coil on the circuit board to a 22uH coil.  The lower inductance increased the battery current to 40ma when the LED light was on, which translated to about 13ma LED current.  The light was much brighter . . . [Circuit by Dave Johnson P.E.,  10/26/12]


Tiny 5v Line Powered Isolated Supply  -  Often a circuit requires a 5v DC supply to power some logic circuits.  The conventional method is to use an AC wall adapter.  But, many systems, which bring AC power onto a circuit board, need a small AC to DC power supply right on the circuit board.  The . . . [Circuit by David A. Johnson P.E.,  07/15/09]


Unplugged Appliance Alarm  -  I received a call from an administrator at a large prison.  He told me that he was having problems with inmates who keep unplugging refrigerators, vending machines and microwave ovens in a commons area.  He wanted a battery-powered device, which could be mount . . . [Circuit by David A. Johnson P.E.,  04/25/10]


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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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