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

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 Display Circuits

10 Turn Pot Forms Frequency Readout  -  Letís say you are designing a signal generator for a test fixture. To adjust the frequency you would like to use a ten turn pot with a nice dial mechanism attached as a frequency display. However, a display range of 0 to 9.99 would be impractical since . . . [Hobby Circuit designed by David A. Johnson P.E.,  01/27/08]


125Khz Ultra Pure Sine Wave Signal Source  -  For some RFID systems operating at 125KHz, a very low distortion signal source reference is needed.  The circuit shown on this page produces a 10-volt peak-to-peak signal into a 50-ohm load, with a distortion of only 0.01% . . . [Hobby Circuit designed by David A. Johnson P.E.,  02/11/02]

Isolated Power Supply for Digital Panel Meters  -  Many inexpensive digital panel meters, such as the one shown below, are designed to operate from a 9v battery.  However, the nature of the panel meter internal design often requires that the DC supply used to power the device be isolated from the ground . . . [Circuit by David A. Johnson P.E.,  09/13/08]


Power Supply for Digital Panel Meters that is Isolated  -  Many inexpensive digital panel meters, such as the one shown below, are designed to operate from a 9v battery.  However, the nature of the panel meter internal design often requires that the DC supply used to power the device be isolated from the ground . . . [Hobby Circuit designed by Dave Johnson P.E.,  09/13/08]


Ten Turn Pot Forms Frequency Readout  -  Letís say you are designing a signal generator for a test fixture. To adjust the frequency you would like to use a ten turn pot with a nice dial mechanism attached as a frequency display. However, a display range of 0 to 9.99 would be impractical since . . . [Hobby Circuit designed by David Johnson P.E.,  01/27/08]

 


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