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Clock Circuits
Clocks: #-A
B-C D-G
H-O P-S
T-Z
Last Updated on:
Wednesday, June 02, 2021 04:22 AM |
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| Circuits Designed by Dave Johnson, P.E. : |
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Line Powered 60hz Clock
Generator - This circuit is connected to
the 120vac power line and transfers 60Hz clock pulses to a logic circuit. The optoisolator used provides
5000 volts of isolation between the power line and the logic side of the circuit . . . [Circuit by David
A. Johnson P.E., 02/23/99]
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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]
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Low Power Oscillators - This page has two unusual two-transistor oscillators. I set the component
values for a low frequency application. Both circuits draw only about 1 microamp of current.
… [Circuit designed by David A. Johnson P. E. , 9/16/07] . . . [Circuit by David A. Johnson P.E.,
12/14/02]
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Links to electronic circuits, electronic schematics and designs for engineers, hobbyists, students &
inventors:
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LED matrix clock - . . . [Written by Hans Summers]
Line Powered 60hz Clock
Generator - This circuit is connected to the
120vac power line and transfers 60Hz clock pulses to a logic circuit. The optoisolator used provides 5000
volts of isolation between the power line and the logic side of the circuit . . . [Circuit by David A.
Johnson P.E., 02/23/99]
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] |
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Low Power Oscillators - This page has two unusual two-transistor oscillators. I set the component
values for a low frequency application. Both circuits draw only about 1 microamp of current. …
[Circuit designed by David A. Johnson P. E. , 9/16/07] . . . [Circuit by David A. Johnson P.E.,
12/14/02]
Low-Power Interrupt Updates Real-Time Clock - 07/07/94 EDN Design Idea Some µP-based systems need a real-time clock. The µP's built-in
timer can do the work, but it usually requires several milliamps of current to keep the timer running. If the
main power drops, the clock requires a backup battery t. . . [by Yongping Xia, EBT Inc, Torrance, CA]
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Low-Power Real Time Clock
- Application Note Published 22-Nov-99. . . [Microchip]
Make an asynchronous clock for VPX-based PCIe systems - 01/19/12 EDN Design Idea Careful crystal selection and an FPGA are key to success. . .
. [by Vadim Vaynerman, Bottom Line Technologies Inc, Westminster, MD]
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