|
 |
DiscoverCircuits.com -- Hobby Corner
Last Updated on:
Wednesday, June 02, 2021 04:39 AM
Hobby Circuits List
The contents &
graphics of Discovercircuits.com are copyright protected.
LINK to Dave's circuit, but DO NOT COPY any files to your WEB
SITE server |
|
|
|
|
|
|
More
Potentiometer Circuits
Display
Circuits |
|
Ten Turn Pot Forms Frequency
Readout
(1/29/2008) |
This hobby circuit gates the output of a continuously operating 32KHz crystal
oscillator to the input of a C-MOS buffer when clock pulses are needed. The
technique gets around the problem of a slow starting crystal oscillator by keeping
the oscillator going and switching on a transistor power stage only as needed.
|
|
| The
method keeps the standby power consumption to a very low 1uA when used with a 3v supply. |
|
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 of "11" at the
highest setting you could shift the display for a range of 1 to 11 and get a nice linear
function. The signal generator circuit could then be setup in nice decade steps with a
range selection switch and get an overall accuracy of about 1/2%. |
|
|
|
|
|
|
 |
|
|
|
More
Potentiometer Circuits
Display Circuits
Hobby Circuits List
eMail David A.
Johnson, P.E. about this circuit |
