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Last Updated on:
Monday, August 18, 2008 04:17 PM
Circuits Designed by Dave Johnson, P.E. :
Ten Turn Pot Forms Frequency Readout
Let’s 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 there is no such frequency as 0. But since many pot dials have a display....
Links to electronic circuits, electronic schematics, designs for engineers,
hobbyists, students & inventors:
MOSFET Serves as Ultrafast Plate Driver: 10/03/02 EDN Design Ideas / (added 1/05) The circuit in
Figure 1 provides a 20-MHz square wave across a set of highly capacitive ion-deflection plates in an experimental instrument. To get the required deflection, the plate voltage must be 20 to
30V, much higher voltage than conventional logic or driver families can provide. To minimize artifacts, the rise and fall times must be very fast, with a minimum of overshoot and ringing....
Power Supply IC Drives Multiple LEDs: 09/02/04 EDN Design Ideas / (added 1/05) Bright LEDs are becoming
prominent sources of light. They often have better efficiency and reliability than do conventional light sources. Although LEDs can operate from an energy source as simple as a battery and a
resistor, driving a string of LEDs in constant-current mode can better match the luminance between the devices without needing to match LEDs for their forward-voltage drop....
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