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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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Digital Circuits

Audio Frequency Digital Noise Generator  -  When you need to test an audio circuit with broadband noise, this circuit works great. It uses just three inexpensive C-MOS ICs that generate a series of output pulses whose widths vary randomly. I included a level control pot . . . [Circuit by Dave Johnson P.E.,  07/04/00]


Digital Counter Using Pedometer  -  There are many occasions when you may want to count something electronically.  Perhaps it is car traffic on a street or items moving down an assembly line.  It might be the number of times a machine is activated or maybe you want to count the number of . . . [Hobby Circuit designed by David A. Johnson P.E.,  08/17/08]

Digital noise generator  -  When you need to test an audio circuit with broadband noise, this circuit works great. It uses just three inexpensive C-MOS ICs that generate a series of output pulses whose widths vary randomly. I included a level control pot . . . [Hobby Circuit designed by David A. Johnson P.E.,  07/04/00]


Poor Man's Timer  -  Often during testing of certain equipment and components, you would like to keep track of the elapsed time in hours, minutes and seconds. There are some nice commercial digital timers and counters available for just this sort of application.  However, . . . [Hobby Circuit designed by David Johnson P.E.,  08/24/08]

 


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