Bicycle Anti-Theft Alarm - I hate to suggest the specific application ‘bicycle’ because it may be use to protect many items from theft. This anti-theft alarm project is built around the inexpensive Measurement Specialties DT piezo film sensor. Every now and then everything seems to work out perfectly as in the Yin and Yang of the cosmos, and __ Designed by Jim Keith
Big LED Clock - The circuit uses a serial-in-parallel out shift register, 74HC595 for receiving serial data from uController board. See example of U5 in the schematic, SER is for data input, SRCLK is shift clock and RCLK is Latch clock. Each data bit is shifted into the register on rising edge of the shift clock. When all data bits are shifted into the 8-bit register, the rising edge of RCLK will clock the data to be latched at each output bit, i.e. QA - QH. __ Designed by Wichit Sirichote
Big-Digit 12/24 Hour Clock - it's large, it's bright, it's very accurate and can be used in either 12 or 24-hour mode. A PIC processor powers the works.__ SiliconChip
Bike Turning Signal - This circuit can be used to indicate left and right turn on a motor-bike. Two identical circuits will be needed, one for left and one for right. __ 555-Timer
Billiards Ball Counter - 21-Feb-14 -Design News: I wanted to play a little pool with my brother, but to play call shot, you really need a set of counters to keep track of the number of each of your successes. My facility has no resources to do this -- neither manual counters nor the familiar beadwork located somewhere above the table. Electronic __ Gadget Freak-Case #251
Binary clock - This clock displays the time in binary using discrete LEDs. The use of Flowcode [1] makes it very easy to program the PIC controller in this project. The circuit is very simple. must register on this site __ Designed by Hans Summers
Binary clock using LED matrix to display a binary clock with 6 digits of 4 binary bits each - Timing and oscillator circuit diagrams / circuit schematics __ Designed by John Main
Binary Coded Decimal (BCD) Clock - The clock circuit above uses seven ICs and 19 LEDs to indicate binary coded decimal time. The LEDs can be arranged (as shown in example above) so that each horizontal group of 3 or 4 LEDs represents a decimal digit between 0 and 9 and each individual LED represents a single bit or (binary digit) of the value. Binary digits __ Designed by Bill Bowden
Binary counter uses LSB feedforward - 08/05/99 EDN Design Ideas: A typical synchronous binary counter contains a series of flip-flops, each of which changes state when all least significant bits (LSBs]are logic 1. This repeated AND function is Achilles' heel of binary counter. A designer has two choices Use a ripple AND function (Figure 1) , or a parallel AND function (Figure 2] Design by Robert Carter, Siemens PLC, Congleton, Cheshire, UK
Bipolar Input (AC) V/F Converter - input integrator uses precision full-wave rectifier for an absolute-value integration charge. Since not ground referenced, the integration ramp is sensed by a diff amp structure that drives the V/F output comparator. A simple comparison forms a sign bit. __ Linear Technology/Analog Devices App Note, Jun 21, 2011
Bi-Polar LED Driver - Some 2-leaded LEDs produce red and green. These are called Bi-polar LEDs. This circuit alternately flashes a red/green bi-polar LED__ 555-Timer
Bistable Switch - This circuit shows how to implement a simple bistable (On/Off) switch. You can also do this with a Schmitt trigger gate or inverter. Just set R1 and R2 to bias input to center point of Schmitt trigger’s hysteresis. __ Designed by Andrew R. Morris
Blinking Arrow - 17 LEDs in four groups bar-mode sequence. Suitable for shop-windows animation etc __ Contact Flavio Dellepiane, fladello @ tin.it
Bob Blick's Propeller Clock - A motor spins the "propeller", and a small microprocessor keeps track of time and changes the pattern on seven LEDs with exact timing to simulate a 7 by 30 array of LEDs. it is an illusion, but it works nicely. __ Designed by Boblick
Bootstrapped Timer - This circuit demonstrates how to use bootstrapping to seriously boost output power of timer. The LC555 can only put out about 50mA as it is. This circuit can put out at least 200mA and goes torail as well. The LM555 timer puts out 300mA max, but does __ Designed by Andrew R. Morris
Boxing Timer - a student needed a timer that counted down one minute. This does exactly that __ Contact P. Townshend - EduTek Ltd
Build a 6-Digit Nixie Clock, Pt.1 - We have been wanting to produce this Nixie Clock project for a long time and now it has finally come to fruition. it has the warm, facsinating glow of Nixie tubes with their hypnotic counting action, mixed with a cool blue glow from a high-brightness LED from underneath each tube. it makes an eye-catching display, both during the day and at night.__ SiliconChip
Build a 6-Digit Nixie Clock, Pt.2 - Last month, we gave some of the history of Nixie tubes and described the design of the NX14 clock and its circuit. This month, we give the assembly details and describe the optional blue LED up-lighting which we think that most constructors will definitely want, together with the attractive see-through Perspex case.__ SiliconChip
Build a Simple Circuit one-chip phototimer - 8-Jul-04 EDN Design Ideas: Recently, I needed to automatically switch on a lamp when it became dark and keep it on for a given time. Trying not to reinvent the wheel, I looked through what was available on the market, but I could not find an inexpensive device that satisfied the requirement. Some products worked like a photoswitch, lighting a lamp when it becomes dark and keeping it on while it is dark—in other wor Design by Abel Raynus, Armatron International, Malden, MA
Bob Blick's Propeller Clock - A motor spins the "propeller", and a small microprocessor keeps track of time and changes the pattern on seven LEDs with exact timing to simulate a 7 by 30 array of LEDs. It is an illusion, but it works nicely. __ Designed by Bob
Blick
Build a synchronous clock - Synchronous clocks are still by far the most accurate currently available as (second-hand) consumer items. While it is certainly possible to make a quartz clock that is extremely accurate, very few manufacturers choose to do so. Because they are normally so cheap, most people would be unwilling to spend the extra to obtain guaranteed accuracy, and if such accuracy were needed, no off-the-shelf quartz clock would be good enough. __ Designed by Rod Elliott (ESP)
Build An LED Propeller Clock-
My "Propeller Clock" is a mechanically scanned LED clock with
seven light emitting diodes that spin, giving the illusion of
numbers floating in the air. This is the first clock I ever
built. I've built a few LED signs, but they get boring because I
already know the message. [Designer: Bob Blick]
Build your own LED cube - This month's featured Gadget Freak is provided by an old favourite of the blog, Peter Griffiths. He shares all the details necessary to build your own 5 x 5 LED cube__
Building an Intel 8008 Computer Clock - About every year I design and build a new clock. This year’s project is a clock based on an intel 8008 first generation 8 bit microprocessor. Because it is a fairly unique project i’m putting more effort into the documentation __ Designed by Len Bayles
Burglar Alarm System - This burglar alarm system circuit is using a infrared proximity detector that triggers an alarm when the rays falling on its sensor are interrupted. it is different from others burglar alarm systems because is a very simple diy project and can offer you great satisfaction. The circuit of IR burglar alarm system comprises __ Designed by Popescu Marian
Butterworth filter has adjustable group Delay - 08/08/02 EDN Design Ideas: The Sallen-Key realization of a 5.25-MHz, three-pole Butterworth filter has a gain of 2V/V and can drive 75Ω back-terminated coax with an overall gain of 1 (Figure 1). Used to reconstruct component-video (Y, Pb, Pr] and RGB signals, t Design by William Stutz, Maxim Integrated Products, Sunnyvale, CA |