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Single Digit Scoreboard - a compact general purpose display __ Contact P. Townshend - EduTek Ltd
Single Gate Synchronizes Clock - 10/27/94 EDN Design Ideas: The deceptively simple circuit in Fig 1 harbors formidable power. Consider when you have a data-clock input to your system for an existing serial data stream. Then, your system people surprise you Design by Phil Harvey, Technology Integration Inc/, Bedford, MA
Single Transistor Relay Toggle Circuit - The circuit below requires a double pole, double throw relay in conjunction with a single transistor to allow toggling the relay with a momentary push button. One set of relay contacts is used to control the load, while the other is used to provide feedback to keep the relay activated or deactivated. Several push buttons can be wired in parallel to allow toggling the relay from different locations. __ Designed by Bill Bowden
Single-digit Nixie clock - A while ago I found a Burroughs B-5853 Nixie tube kicking around in the lab and decided that I should put it to good use. Since I only had one of this size, I wanted to make a single-digit display out of it. __ Designed by © 2007 Riad S. Wahby
Siren 100dB - This is a very loud siren and if two or more piezo's are located in a room, the burglar does not know where the sound is coming from. __ 555-Timer
Sleep Switch Cum Wake Up Timer - Here is a sleep-switch circuit that can be easily converted into a wake-up timer. A dual-mode time setting makes the system versatile. The circuit is low-cost and can function as a...__ Electronics Projects for You
Sleep Timer - Use this sleep timer for your radio set at the bedside. The time interval from START till shut off is determined by R and C by a formula; t =16384RC/2.2 seconds. For example, R=100k、 C=1.5uF（layered ceramic capacitor） gives t =1117 seconds（about 19 minutes) __ Designed by MINOWA, Makoto 7N3WVM
Slow diodes or handy timing Devices? - 16-Sep-04 EDN Design Ideas: Most designers consider slowness in diodes to be an imperfection or a limitation. Why not take apositive view of the situation? After all, a zener or an avalanche diode is nothan a diode with a limited breakdown voltage, and you can view a varactor as a diode with a large and nonlinear parasitic capacitance Design by Louis Vlemincq, Belgacom, Evere, Belgium
Smart Cooling Fan - A continuously running cooling fan is a big nuisance and is not very crucial in most instruments. The 12V smart fan control presented here allows the fan to run at rates varying from once a second to once in ten seconds approximately. in case of a battery powered instrument, this idea will save some power too! Basically, the __ Designed by T.K. Hareendran
Smart Photoresistor Timer Needs Few Components - 3-Sep-09 EDN Design Ideas: Smart photoresistor senses darkness and then turns off Design by Abel Raynus, Armatron International Inc, Malden, MA
Smooth Tone Clickless CW SideTone Generator - This circuit is about as good as it gets for generating morse code tones. it may be used as a code practice oscillator, a tone generator for a keyer, a sidetone oscillator for a CW transmitter or an audio Modulated CW (MCW) generator for an FM transmitter or repeater __ Designed by G. Forrest Cook
Soft-Start for Power Amps - Although the soft start circuit can be added to any sized transformer, the winding resistance of 300VA and smaller transformers is generally sufficient to prevent a massive surge current. Use of a soft start circuit is definitely recommended for 500VA and larger transformers __ Designed by Rod Elliott ESP
Solar Power System Guard - The common home solar power system, in principle consists of a roof-mounted solar panel, a charge controller and a storage battery bank plus direct or electronic inverter powered electric lighting units. in some situations, the solar panel is mounted on a mast extended from ground and this may become an obstacle during night __ Designed by T.K. Hareendran
Solar-Powered Sensor Controls Traffic - 26-Nov-09 EDN Design Ideas: A traffic-sensor post measures vehicle location and speed at an intersection, providing an accurate, effective, inexpensive approach to monitoring traffic flow Design by Larry K Baxter, Capsense, Lexington, MA
Speed Acces to µP's Real-Time Clock - 06/05/98 EDN Design Ideas: (Scroll to find this circuit) The DS5000T (Dallas Semiconductors, www. dalsemi. com) is an 8051-compatible processor that integrates nonvolatile memory and a real-time clock. This module has an impressive set of functional extensio Design by Jerzy Chrzaszcz, Warsaw University of Technology, Warsaw, Poland
SP-L Modulator uses Single Speed Bit Clock - 08/15/97 EDN Design Ideas: Split-level (SP-L) , or Manchester, encoding is a common modulation scheme in data transmission (Figure 1). SP-L is popular because bit-clock extraction at the receiving end is easy, and the modulator circuit is simple to implement--simple, but not trivial, because the output of this classic circuit suffers from severe spikes during data transitions (Figure 2). A different circuit eliminates the spiking problem (Figure 3). This circuit resamples data after stabilization, but to do so, it needs a double-speed clock. This need can be as annoying as having spikes. Design by Massimo Garavaglia, Robecchetto con Induno, Italy
Square Wave Oscillator - it has adjustable (and settable) frequencies from 1Hz to 100kHz and is an ideal piece of Test Equipment. __ 555-Timer
Square wave oscillator using 555 timer chip - This project is a piece of test equipment. it's a square wave oscillator with 6 selectable frequencies from 1Hz to 100kHz, incrementing in decade values. it's most useful application is as a Signal injector for radios and TV's. A square wave is the most suitable for testing the iF (intermediate Frequency) strip as the signal will pass through the iF transformers without any attenuation, no matter what __ Designed by Collin Mitchell
Step Alarm - This Circuit can monitor the door steps or Staircase. When a person crosses the steps, the alarm sounds indicating the entry. The circuit is too sensitive and operates in day light. The circuit uses an NPN Darlington phototransistor L14F1. it senses the intensity of light through its exposed base and passes current in the __ Designed by D Mohankumar
Step Km Counter Max - Pedometer has a range of 9.950 meters with2-digits. Slip it in pants pocket for walking and jogging __ Contact Flavio Dellepiane, fladello @ tin.it
Step-Km Counter - Pedometer has a range of 9.950 meters with2-digits. Slip it in pants pocket for walking and jogging __ Designed by RED Free Circuit Designs
Stepper Motor Controller - The direction of rotation is determined by the FORWARD and REVERSE switches and the motor does not take any current when a switch is not pressed. __ 555-Timer
Stop Clock with Battery Backup - Stop clock is widely used in various fields to measure the timing of events. Science laboratory experiments, such as measurement of discharge rate of capacitors with different resistors, acceleration due to...__ Electronics Projects for You
Stopwatch 0-60sec - in the present article, we will describe the function of a digital stopwatch, 0 – 99 sec. The function of the stopwatch, relies in the use of 4 integrated circuits, which in this case belong to National Semiconductor (http://www. national. com). it is obvious that other integrated circuits can be used to achieve the same result, however in this case we have used the following parts __ Designed by Pafilis Ioannis - Aristotle University of Thessaloniki Department of Electronics and Telecommunications
Sun tanning timer - This timer was designed for people wanting to get tanned but at the same time wishing to avoid an excessive exposure to sunlight. A Rotary Switch sets the timer according to six classified Photo-types (see table). A Photo resistor extends the preset time value according to sunlight brightness (see table). __ Contact Flavio Dellepiane, fladello @ tin.it
Sun-Up Alarm - The Sun - Up Alarm can be used to provide a audible alarm for when the sun comes up or it can be used in a dark area and detect when a light comes on. it can also be used to detect a light beam, headlights etc. The circuit works as follows. The phototransistor is very sensitive to light. (Any phototransistor will work fine) __ Designed by Randy Linscott
Super Low Distortion Variable Sine Wave Oscillator - The LT1028 (gain of –1 stable) /LT1128 (gain of +1 stable) achieve a new standard of excellence in noise performance with 0.85nV/rtHz 1kHz noise, 1.0nV/rtHz 10Hz noise. This ultralow noise is combined with excellent high speed specifications (gain-bandwidth product is 75MHz for LT1028, 20MHz for LT1128) , distortion-free __ Linear Technology/Analog Devices App Note, Jun 21, 2011
Super Simple Circuit Counter - Super Simple Counter The freebie metal detector I previously designed for [url=http://www. thomasscarborough. blogspot. com/]this blog[/url] is by far my most popular post. So here is another circuit I designed today. Counters must be among the more sought-after electronic circuits. However, even the simplest of them are complex. This provides a "super simple" solution, to count from 0 to 43, 200 on a quartz clock face (60 seconds × 60 minutes × 12 hours). it would be capable e. g. of counting attendance at most major public events. Almost any cheap analogue quartz clock is used for the__
Super VXO - The Super VXO uses two X-tals of the identical nominal frequency in parallel instead of a single X-tal of a conventional VXO. Nothing else is special. it can pull considerablly more frequencies than the conventional one. About 40kHz for a pair of 10.15MHz X-tals, and 90kHz for 13MHz, according to my experiences. __ Designed by MINOWA, Makoto 7N3WVM
Swiss Railroad Clock - Swiss railway clock is precise digital wifI clock. it's a miniature web server and very good demo for ESP8266 & Lua fanclub.
By mapping ports of your router, you can connect to it from anywhere on the world. This clock uses Lua software and
trendy vector graphics format SVG with animations. The clock is particularly interesting for its graphic design. in terms of program, it using
synchronization the time from an external NTP server. Thanks to this, clock is quite fast and precision, which was my goal. __ Designed by © Pavel Janko
Switch Debounce - The output goes HiGH for 100mS when the switch is pressed. __ 555-Timer
Switch Debouncer - This circuit will remove the transient spikes and contact bounces from a non-latching push button switch. __ Designed by Andy Collison
Synchronized Timing Generators - Circuit ideas for Designers App Note__ Advanced Linear Devices, Inc
System implements digital clock Modulation - 10/28/04 EDN Design Ideas: in spread-spectrum and direct-sequence receivers, it's often necessary to change the frequency of the clock oscillator, and thus the spreading-code clock, to lock the receiver's reference pseudorandom-noise code to the incoming cod Design by Dan Doberstein, DKD Instruments, Nipomo, CA |
