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Universal Counter - Typical frequency counter that built by electronics hobbyists. This counter can measure time periods and has communication interface, so that I named this "Universal Counter". __ Designed by The Electronic Lives Manufacturing-presented Chan
Universal Timer with Zero Standby Current - This design came about when the author wanted better control of his 12 V solar-charged garden lighting installation. it is however a versatile circuit which can also be used to switch other types of equipmentmust register on this site __ Designed by Published in Elecktor July/Aug, 2010
Universal Watchdog Fully Controls µ Preset - 05/25/95 EDN Design Ideas: Many µPs contain internal watchdog timers, and you may wonder why you need another stand-alone circuit. Unfortunately, more highly integrated functions have preset parameters that you may want to change. Also, internal watchdogs are generally a simple combination of a flip-flop and a timer. if the program does not start properly on the first try, the timer is of no use because the program never turns on the watchdog. This watchdog catches exactly this condition Design by Terje Kvinge, Nera AS, Kokstad, Norway
Unusual clock with AT89C2051 - interesting worked out example of clock with only 7 lad's - published in magazine "Svijet elektronike" Nr.46 ( June / July 2004) Author: ivica Novakovic __ Designed by © Ivica Novakovic
Up / Down Digital Counter with 7 Segment LED Displays - REViSED Really as Simple as you can get and has 4 Displays __ Designed by G.L. Chemelec
Up/Down Fading LED - These two circuits make a LED fade on and off. The first circuit charges a 100u and the transistor amplifies the current entering the 100u and delivers 100 times this value to the LED. __ 555-Timer
USB Clock with LCD Readout, Pt.1 - This LCD USB Clock connects to your PC's USB port. it synchronises its time with your PC - and ultimately an internet time server - when your PC is on to maintain accurate time-keeping. it can also operate on its own using battery back-up and has user-selectable display modes.__ SiliconChip
USB Clock with LCD Readout, Pt.2 - Last month, we detailed the circuit of the USB Clock and showed you how to build it. This month, we detail the software installation and describe how it is used. We also describe how to synchronise your PC to an internet time server and how to synchronise the USB Clock to the PC each time the PC boots up.__ SiliconChip
Use a 555 timer as a switch-mode power supply - 14-Nov-02 EDN Design Ideas: Most switch-mode power supplies rely on a PWM (pulse-width-modulated] output that is controlled via voltage feedback. A 555-timer IC can inexpensively perform PWM. The circuit in Figure 1 shows how to turn a 555 PWM circuit into an switch-mode power supply with only one simple equation. The design uses two 555s Design by Aaron Lager, Masterwork Electronics, Rohnert Park, CA
Use a PC's parallel port to program a clock source - 12/07/04 EDN Design Ideas: This Design idea shows how you can use Linear Technology's LTC6903 programmable oscillator as a clock source for direct-digital synthesis, data conversion, switched-capacitor filtering, clock, and voltage-controlled oscillator circui Design by William Grill, Honeywell BRGA, Lenexa, KS
Use a PWM fan controller in an EMI-susceptible - 02/16/06 EDN Design Ideas: Control it with either an external negative-temperature-coefficient thermistor or a PIC microcontroller and its SMBus serial-data bus Design by Dimitri Danyuk, Niles Audio Corp
Use a system's real-time clock to "hide" a code sequence - 10/27/05 EDN Design Ideas: Keep key code sections protected from prying users Design by Mihaela Costin, Delmhorst Instruments, Towaco, NJ
Use a trick to count scope events - 01/21/99 EDN Design Ideas: One advantage digital storage oscilloscopes (DSOs] have over analog scopes is trace persistence. You can easily see infrequent waveform features using a scope in infinite-persistence mode. However, the frequency of these features relative to that of a "normal" signal Page includes several designs. Scroll to find this one Design by Allen Montijo, Hewlett-Packard, Colorado Springs, CO
Use Eight Timers with PIC16Fxxx Microcontrollers - 18-Feb-10 EDN Design Ideas: Timers debounce switches and let you decide when lapses have expired Design by Luis G Uribe C, Caracas, Venezuela
Use Thermostat as 12 Volt Timer - Find out how an old battery powered thermostat can be used as a low voltage automatic timer. __ Designed by REUK-Renewable Energy UK website
Use time-domain analysis of Zobel network - 06/27/02 EDN Design Ideas: A Zobel network is useful in making a reactive load appear as a pure resistance to a driving source prone to stability problems (Reference 1]. A typical situation is an audio power amplifier driving a loudspeaker, modeled at first approximation as an inductance and a series resistor (Figure 1a]. The addition of a series R2C network in parallel with the series R1L network forms a Zobel network Design by Noël Boutin, Université de Sherbrooke, PQ, Canada
Using 555 Timer as an A/D Converter - Measure voltages accurately with a microcontroller using this simple circuit. includes sample program for the Parallax Basic Stamp. __ Designed by Boblick
Using the AT89C4051 as a RTC (Real-Time Clock) - if you are looking for the simplest project, you are at the right place. its a digial clock which make use of AT89C4051 to work as a Real time clock. __ Designed by Ajay Bhargav ajay_bhargav @ hotmail.com |
