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Dynamic Clock Provides for Zero Wait States - 03/27/97 EDN Design Idea The clock controller in Figure 1, which you can implement in a
PLD, dynamically manipulates the timing of synchronous FIFO clock and control signals to provide for
zero-wait-state accesses. These zero wait states would be otherwi. . . [by Mike Nelson, Polaris
Communications Inc, Portland, OR]
Edge detector runs off of single supply - 12/04/97 EDN Design Idea You can use a single-supply circuit to generate a pulse on both
the rising and the falling edges of a signal for use with counters or similar devices that require only a
rising edge to trigger (Figure 1a). R1 and C1form a differ. . . [by Joe Meloche, Ingersoll-Rand Fluid
Products Division, Bryan, OH]
Exclusive 2.5 GHz Frequency Counter
with Blue 2x16 LCD display - This project explain a
very powerful frequency counter which has many useful software functions.
The software can add or subtract 3 different IF frequencies (±455 kHz , ±10. 7 MHz and ±21. 4 MHz). You have
also two level of resolutions, 1kHz and 100Hz. The main oscillator can be on-board 13MHz or external 10 MHz.
The counter data can easy be transmitted to computer with RS232 cable (software below) The construction is
extremely simple and the unit is very small. This project comes in a KIT version, se more details below. . .
. [can't find owner's name on website]
Fail-Safe Monitoring & Clock Frequency Switching using the PIC16f684 - Application Note Published 16-Dec-03. . . [Microchip]
Front Desk Service Beeper - This device functions like a lobby desk service request bell. A short beep is sounded
whenever the large pushbutton on top of the device is pressed. Once pressed, the device will not make another
beep until at least 2 minutes of time has elapsed . . . [Hobby Circuit designed by David A. Johnson P.E.,
09/25/05]
Garage Door Timer - The circuit below is designed to automatically close a garage door, if it was left open for
a long period of time. A reed relay and magnet combination sense when the door is fully open. An ultra low
power voltage comparator oscillator and two 74HC4040 ICs are used to generate the time delay . . . [Circuit
by Dave Johnson P.E., 05/15/11]
Garden Timer with Remote
control - Few years ago we control the lights in the
garden with a automatic-timer-switch, very nice but when the evening gets longer or shorter we had to adapt
the timer each week. In that time I came in contact with programming microprocessors so my first project was
born. The first garden timer was a simple 1 output. The timing was controlled by the PIC and every month I
had to change the minutes. So back to the table and design the second garden timer able to control 3 relays,
left, mid and right side of the garden. It provided also 4 modes: – always off – always on – from dusk to
dawn – from dusk to timer and the timing was dedicated to a RTC DS1307. . . .
Gated clock has duty-cycle control - 08/17/00 EDN
Design Idea The circuit in Figure 1 produces clock pulses with variable duty cycle from a gated clock. The
output of the circuit, pulse, is always 180° out of phase with the clock input. When the delay-logic
elements, IC5 and IC7, have the s. . . [by Paul Kemp, University of Colorado, Colorado Springs, CO]
Generating
Multiple Clock Outputs from the AD9540 - AN-769 Analog
Devices App Note. . .
Giant nixie clock - . . . [Written by Hans Summers]
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