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CMOS
Gate Implements Reverse Phase Control - 05/21/98 EDN Design Ideas: (FILE has severa circuits, scroll down) The circuit in Figure 1 implements a "reverse" phase control, using only a single CMOS
4001 quad NOR gate. The circuit is known as a reverse phase control because, unlike with common TRIAC or SCR controls, conduction begins at the zero crossing of the ac sine wave. Timing of the turn-off point Design by JC Johnson, Lithonia Lighting, Decatur, GA
CMOS
Gate Makes Long-Duration Timers using RC Components - 03/01/12 EDN Design Ideas: Use a common CMOS
gate to make long duration timers using low-value RC components. The CD4011 CMOS
NAND gate has a typical input current of 10 PA at room temperature. You can charge a capacitor connected to the gate input with currents on the order of hundreds of picoamperes and neglect the influence of the gate-input current on the charging time of the capacitor. You normally need large-value resistors to limit currents to this low level. These resistors are not commonly available. You can instead use a transistor as a current attenuator, despite its more usual amplifying nature. Design by Raju Baddi, Tata Institute of Fundamental Research, Pune, India
Compute a Histogram In an FPGA with One Clock - 02/03/11 EDN Design Ideas: Use a histogram to analyze large amounts of data. Histograms are often useful tools for analyzing digital data. To get reliable results from a histogram, though, you must collect large amounts of data, often with 100, 000 to 1 million points. if you need to collect an ADC’s digital outputs for analysis, you can use an FPGA (Figure 1). Design by Mohit Kumar, Texas Instruments, Bangalore, India
Computer, Long Period, 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 . . . Hobby Circuit designed by Dave Johnson P.E.-January, 1998
Computerised Universal Timer - This simple and flexible timer is more accurate than the real-time clock of the computer used for the purpose. it can be used in laboratories, dark rooms, kitchens, and for competitions...__ Electronics Projects for You
Consecutive Test Sequencer - This circuit highlights the use of LTC6993 Monostable Pulse Generator and LTC6994 Delay Block/Debouncer in a consecutive test sequencer application. This example is configured to provide a one second duration sequential test pulses after an initial delay. The initial delay is provided by the LTC6994 and the consecutive one__ Linear Technology/Analog Devices App Note, Oct 26th 2010
Continuity buzzer is frugal with power - 04/15/99 EDN Design Ideas: (contains several designs, scroll to find this one) The continuity detector in Figure 1 is based on W Dijkstra's "Fleapower circuit detects short circuits" (EDN, July 2, 1998, pg 122). The buzzer indicator allows you to devote full attention to making the connection without having to observe an LED. The circuit also consumes less power than Dijkstra's circuit. Power comes from two AA or AAA cells, which last for a period equal to their shelf life. Current consumption is less than 2.5 mA when the circuit detects continuity and less than 1.7 mA for an open circuit. Open-circuit voltage is less than 100 mV, and short-circuit current is less than 1 mA. Design by Hans Krobath, EEC, Nesconset, NY
Continuity Tester - This circuit will detect low resistances and high resistances to produce a tone from the speaker. it will detect up to 200k and the circuit automatically turns off when the probes are not used. __ 555-Timer
Continuity Tester - This circuit senses only dead shorts on a populated board. it will not ring through or damage components. it shuts off when not in use. it was first published in Electronics magazine, June 21, 1979, page 145 __ Designed by Andrew R. Morris
Continuity Tester - Among the essentials for circuit design and prototyping is the continuity tester, a simple device which provides an audible indication when a sufficiently low resistance is applied between its input probes. This version has a feature which automatically turns off the tester after about two minutes, thereby saving the 9 volt battery from inadvertent discharge. The tester produces a high-pitch tone when less than 10 ohms is placed between the input probes. The 10 ohm threshold is a convenient value that indicates hard-wired paths, but excludes indications for circuit paths through most components. in addition, the amount of current presented to the circuit by this __ Designed by Arthur Harrison
Continuity Tester Fits Into Shirt Pocket - 10-Jan-08 EDN Design Ideas: A pocket-sized continuity tester responds quickly to shorts or opens and is protected against connection to a live circuit Design by Tom Wason, Phoenixville, PA
Continuity Tester with a Chirping Sound - Today, there’s a party at your home. And you are busy detecting faults in the decorative lights hanging over the boundaries of your house. You want to finish the job before...__ Electronics Projects for You
Continuity Tester-essential for Digital projects - This is another invaluable piece of test equipment for digital work. it has been designed by us to cater for a particular application servicing digital projects sent in for repair. __ Designed by Collin Mitchell
Control a processor's power supply in real time - 31-Mar-05 EDN Design Ideas: Dynamic control of processor's supply rail minimizes power consumption Design by Yogesh Sharma, Analog Devices, San Jose, CA
Conversion Handles Binary or BCD - 03/01/12 EDN Design Ideas: Separate binary and BCD up/down counters permit both binary-to-BCD and BCD-to-binary conversion in one circuit. The subroutine "FASTBCD" (Listing 1) for 8051 µPs quickly converts 16-bit binary to 24-bit BCD data. The conversion algorithm involves left-shifting bits from the high-order bit of the binary number into the carry bit while left-shifting the carry bits into the low-order bit of a BCD shift register using BCD left-shift operations. Design by Keith Rubow, Olec Inc, Irvine, CA
Convert Solid-state Relay to Timer - 05/09/96 EDN Design Ideas: Finding a 480V-ac solid-state timer having zero-crossover switching may prove to be an impossible task. Most solid-state timers are rated at only 1A and have voltage ratings no higher than 240V ac. Solid-state relays (SSRs) , in co Design by Henno Normet, Tavares, FL
Convert Thermostat to 12v Timer Switch - Find out how to modify a battery powered thermostat to be used as a 12 Volt DC timer switch. __ Designed by REUK-Renewable Energy UK website
Convert your smartphone into a pedometer & tracking Device - EDN Design Ideas: 10/22/12 When you go hiking or mountain biking, or simply take a long walk around the neighborhood, you might wonder about the distance you covered or specific details, such as speed. A specialized device for such a task is an expensive idea. Now, however, the increasing penetration of smartphones in the market with built-in GPS devices makes it possible to configure a mobile phone to log or send the current readings from its sensors to a server for viewing and processing. This design idea describes a simple approach to log readings from a GPS using the Python scripting language. An advantage of Python is that an electronics engineer need not delve into the complex realm of C/C++ calls for Symbian/Android architectures to accomplish this simple task. All that is required is the installation on a phone of the Python interpreter, along with a text file containing the script. Design by Ali Asgher Mansoor Habiby and Abdus Sami Abdul Qayyum, Sir Syed University, Karachi, Pakistan
Count Cars with Laser - This is an illustration how a laser could be used to count traffic and measure the speed of each car passing through the sensor area . . . Hobby Circuit designed by David A. Johnson P.E.-January, 2007
Count Down Alarm, 3 LED Displays multiplexed & PIC16F84 - Here I have added two fets for the time-out switch, it is like an electronic relay, just much more reliable it can be used to sound a big horn, or what ever you like. __ Designed by Thomas Scherrer OZ2CPU
Count Objects as They Pass By - 07/15/10 EDN Design Ideas: Counting objects is easy when the objects have regular motion, but it becomes more difficult when the objects vibrate or you have to manually move them. To deal with this problem, you need a reliable, error-free system of detecting an object. in this case, simple circuits with optical interruption switches, IR barriers, or other sensors don’t work because objects may cross a sensor more than once Design by Vladimir Rentyuk, Zaporozhye, Ukraine
Count-down timer - On this page, I will introduce the Count-down timer with PIC 16F84A. I am putting a count-down timer by the hardware on Electronic Circuits Application Garage. The function of the timer is the same as it approximately. (The stop switch is added) Because this unit was made compactly, the wiring of the back becomes quite complicated. __ Designed by Seiichi Inoue
Countdown timer may never need battery replacement - 06/23/05 EDN Design Ideas: Processor-based timer draws microamps Design by Mark E Buccini, Texas Instruments, Houston, TX
Counter IC Provides Wait States for 8031/806 - 06/22/95 EDN Design Ideas: When you connect a slow device to a µC, you insert a number of wait states to extend the read or write cycle. For the 8031 or 8051 family, however, no input is available for extending the cycle. So, to extend the cycle, stretch the period of the clock connected to the µC's XTAL1 input. in Fig 1, IC 3 is an up/down counter configured as a down counter, with the number of wait states preset at inputs A to D. The preset IC 4 enables the clock connected to the µC's XTAL1 input. Design by Y
Tam, Canadian Marconi Co, Ottawa, ON, Canada
Counter Provides Divide by 4.5 Function - 05/22/97 EDN Design Ideas: it's common practice to use a divide-by-N circuit to create a free-running clock based on another clock source. Designing such a circuit where N is a noninteger is not as difficult as you might think. Listing 1 gives the synthesizable VHDL code to configure a divide-by-4.5 circuit. Figure 1 shows the simulation result for a 50-MHz input clock and a 11.11-MHz output. You can apply the concept given here for any N, where N is 1.5, 2.5, 3.5. First, consider what divide-by-4.5 is. it simply means that, for every nine clocks, you need to generate two symmetrical pulses. Design by Alex Sumarsono, Baynetworks Inc, San Jose, CA
Courtesy Light Delay for Cars - Simple circuit has an adjustable delay from 7-40s and fades the lights out at the end of the delay period. And the same circuit suits all cars.__ SiliconChip
Crank Doorbell - Here is an interesting hobby circuit of a “crank” door bell! The circuit is built around a timer 555 and a musical piezo-buzzer. The circuit works off 9 volt battery supply. One 9volt PP3/6F22 compact battery is enough for powering the whole gadget. Timer IC (NE555) is wired in monostable mode to produce a time out __ Designed by T.K. Hareendran
Crossover Gate—Break-Before-Make Interval Timer - The LTC6994 is a programmable delay block with a range of 1μs to 33.6 seconds. The LTC6994 is part of the TimerBlox family of versatile silicon timing devices. A single resistor, RSET , programs an internal master oscillator frequency, setting the LTC6994’s time base. The output (OUT) follows the input (iN) after delaying__ Linear Technology/Analog Devices App Note, Oct 26th 2010
Crystal switcher using diodes - Schematic only, no circuit description __ Designed by Guy Roels ON6MU
Cupboard Light - Here is a simple circuit that can temporarily illuminate your cupboard or other such usually dark places where mains connection is either not possible or not worthwhile. The circuit is nothing...__ Electronics Projects for You
Cupboard Lights Switch - This Cupboard lights circuit is an automatic White LED lamp used to illuminate the interior of cupboard to search things. The lamp automatically turns on when the door of the cupboard opens and stays on for three minutes then turns off. The circuit uses the popular timer IC NE 555 for the time delay. Components R1 and C2 gives __ Designed by D Mohankumar |
