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Projection Clock - I'm pretty nearsighted and also an intermittent sleeper, and it has always frustrated me to
contort myself far enough to read my clock radio display without my glasses on. . . . [Designed by Markus
Wandel]
Prop Clock Project - A propeller clock is a fast rotating array of 7 high bright leds. After triggering the hall
sensor it builds a virtual picture. The software is measuring the time of the rotations to justify the width.
The power for the circuit board and the leds is inductive transferred by one of the video head coils. A infra
red led transfers the DCF signal to the pcb. . . [Lucifer Ursum]
Propeller Message
Display with Temperature Indicator - Here we
describe a microcontroller-based propeller display that displays any message sent to it via hyper-terminal of
a personal computer. Moreover, a temperature sensing IC (TMP125) is mounted onto the propeller display to
display temperature in real time. It gives a 360-degree view and displays several characters in a revolving
circular path using just eight LEDs. The main highlight o this project is a vertical facing display with true
360-degree viewing angle. . . . [© EFY Enterprises Pvt. Ltd. All rights reserved.]
Propellor clock
PIC16F84 - a few light emitting diodes spin, precisely
controlled by a PIC microprocessor, giving the illusion of a larger array. . . [Bob Blick's design]
Provisionary Data Rates using the AD9951 DDS as an Agile Reference Clock for the ADN2812 Continuous-Rate CDR - AN-632 Analog Devices App Note. . .
Pushbutton Activates
Service Request Beeper - A single press of a
pushbutton switch turns on a beeper for one second but can’t be activated again for 60 seconds. . . .
[Circuit by David A. Johnson P.E., 09/25/05]
PWM fan controller in an EMI-susceptible circuit - 02/16/06 EDN Design Idea Control it with either an external
negative-temperature-coefficient thermistor or a PIC microcontroller and its SMBus serial-data bus. . . [by
Dimitri Danyuk, Niles Audio Corp]
PWM Motor
Controller uses a 555 Timer - Using a CMOS version
of the 555 timer, this circuit can be used to control the speed of a motor by adjusting the duty cycle of the
pulses sent to the motor . . . [Hobby Circuit designed by David Johnson P.E., 02/01/07]
Quartz Clock Timebase -
Many electronic projects call for a timebase generator, accurate to a second or so. One way of producing this
is with a microcontroller, quartz crystal and some software. But a far cheaper and simpler approach is to
recycle an old analogue quartz clock. must register on this site. . . [Published in Elecktor July/Augu,
2010]
Radio Clock for PC's - There are a number of low frequency time signals around the world that broadcast accurate
time and date information. These signals are used by the many cheap radio controlled wall and desk clocks
that can easily be purchased these days. The time signal is also useful for the synchronizing the clocks of
computers. . . [Jonathan A. Buzzard]
Real-time-clock chip makes low-power oscillator - 11/23/00 EDN Design Idea Many systems use watch-crystalbased, 32. 768-kHz oscillators. In
battery-powered designs, the 32-kHz oscillator may consume a fairly high percentage of the total power
budget. Reduced power consumption. PDF has many circuits, scoll. . . [by Yongping Xia, Teldata Inc, Los
Angeles, CA]
Relay clock - Even if relay logic is now an old technology, I haven’t abandoned it. This clock circuit
works for a sequence of 4 relays only, but the schematic is repetitive, so it may be extended. The relays K
and K1 work in astable condition and are supposed to send the clock signal to the others. Once the circuit is
supplied the cycle has to be triggered by pressing the button, then it continues without stopping. . .
[Andrea, I live in Central Italy]
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