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Circuits designed by David Johnson, P.E.
Last Updated on: Thursday, April 07, 2016 02:04 PM

Master Category List - Dave's Circuits

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Delay Circuits

Computer, Long Period, Watch Dog Timer  -  This circuit uses a simple 4060 IC oscillator/timer that is reset periodically by a computer. Should the computer fail to send a pulse, the output changes state. The time can easily be set from seconds to hours . . . [Hobby Circuit designed by Dave Johnson P.E.,  01/01/98]


Long Period Computer Watch Dog Timer  -  This circuit uses a simple 4060 IC oscillator/timer that is reset periodically by a computer. Should the computer fail to send a pulse, the output changes state. The time can easily be set from seconds to hours . . . [Circuit by David Johnson P.E.,  01/01/98]


On/Off Latch Circuit with 2 Second Delay  -  A Discover Circuits visitor needed a latch circuit which could operate using a power supply voltage ranging from 3v to 24v.  He wanted to use a tiny pushbutton switch to turn on and off power to a load.  However, he wanted a 2 second delay between the switch activation and the state change of the output . . . [Circuit by Dave Johnson P.E.,  06/30/13]


Press and Hold Latching Circuit  -  A Discover Circuits visitor needed a latch circuit which could operate using a power supply voltage ranging from 3v to 24v.  He wanted to use a tiny pushbutton switch to turn on and off power to a load.  However, he wanted a 2 second delay between the switch activation and the state change of the output . . . [Hobby Circuit designed by David Johnson P.E.,  06/30/13]

 

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