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Christmas Star - Christmas just would not be Christmas if you do not put a flashing star on your Christmas tree. Here is the circuit of such a flashing star.Fig.1 shows the circuit...__ Electronics Projects for You Circuit forms fast, portable light pulser - 16-Oct-03 EDN-Design Ideas The absence of a fast one-shot multivibrator in the entire TTL family, as well as the low-voltage swing and unwieldy supply requirements of ECL, drove us to exploit the fast transition times and low propagation delays of F-series gates. The application called for the implementation of a compact, portable, fast light pulser for field testing fast photomultipliers in gamma-ray astronomy work Design by SK Kaul and IK Kaul, Bhabha Atomic Research Centre, Trombay, Mumbai, India
Clap Relay - Clap sensitive on-off Relay.3V Battery operated, small portable unit, __ Contact: Flavio Dellepiane, fladello @ tin.it
CMOS
IC Flashes LED - Judging from the numerous references I have received, this electronic circuit, hobby circuit seems to be rather popular. Many published circuits which flash LEDs need 3 or more volts. This electronic circuit uses only a single inexpensive C-MOS IC and . . . Hobby Circuit designed by Dave Johnson P.E.-June, 2000
Color Organ - This is a simple, one lamp colour organ. It is far less complicated then the Three Channel Colour Organ. It is simply a lamp controlled by an SCR. It can be built in a few minutes, and combined with other circuits to make some pretty neat effects. __ Designed by Aaron Cake
Color Organ - PIC Project This unit uses a PIC16F84 with an 8 bit A/D. The signal from both stereo channels is combined and digitized. Each of 5 frequency bands is processed using a 16 point FFT. Then the level of each channel is output as PWM (pulse width modulation) to a set of solid state relays __ Designed by Luhan Monat-Mesa Arizona
Color Organ - Schematic + Info + pictures __ Designed by Lennie Zink
Colour (Sound) Organ - This is a simple, one lamp colour organ. It is far less complicated then the Three Channel Colour Organ. It is simply a lamp controlled by an SCR. It can be built in a few minutes, and combined with other circuits to make some pretty neat effects. __ Designed by Aaron Cake
Colour Sensor - Colour sensor is an interesting project for hobbyists. The circuit can sense eight colours, i. e. blue, green and red (primary colours) ; magenta, yellow and cyan (secondary colours) ; and black and white. The circuit is based on the fundamentals of optics and digital electronics. The object whose colour is required to be detected should be placed in front of the system. The light rays reflected from the object will fall on the three convex lenses which are fixed in front of the three LDRs. The convex lenses are used to converge light rays. This helps to increase the sensitivity of
Common Ground 3 Channel Color Organ for a Car - An Active Filter Design. __ Designed by G.L. Chemelec
Common HOT 3 Channel Color Organ for a Car - An Active Filter Design. __ Designed by G.L. Chemelec
Controller for a 9v Powered Xenon Photoflash - This 9v battery powered circuit is designed for remote control flash needs. A charge control circuit turns off the high voltage generator when the photoflash capacitor is fully charged. A neon lamp is included to indicate when the system is ready to flash . . . Hobby Circuit designed by David Johnson P.E.-June, 2000
Convert Solar Powered Light to Flasher - The circuit converts an off-the-shelf solar powered LED path light from producing a steady state light to one that produces a flash. This circuit includes a tiny dual Schmitt trigger inverter IC which form the pulse generator and the daylight sensor circuit. The circuit produces a positive pulse, which feeds the constant current LED driver circuit.. . . Circuit by David Johnson P.E.-March, 2010
Courtesy Light - Two LED-eyes follow the rhythm of music or speech; 3V Battery-operated device suitable for pins or badges __ Contact: Flavio Dellepiane, fladello @ tin.it
Dancing LEDs - LED sequencer: follows the rhythm of music or speech; 9V Battery-operated portable unit __ Contact: Flavio Dellepiane, fladello @ tin.it
Dark-activated LED or Lamp Flasher - This circuit adopts the rather unusual Bowes/White emitter coupled multivibrator circuit. The oscillation frequency is about 1Hz and is set by C1 value. __ Contact: Flavio Dellepiane, fladello @ tin.it
Daytime Running Lights Controller - Auto makers have been gradually switching to light emitting diode (LED) lighting for automotive headlamps because of its features such as high efficiency and long service life. In addition, from a...__ Electronics Projects for You
Descrete Multistage Light Sequencer - The drawing below illustrates a multistage light sequencer using descrete parts and no integrated circuits. The idea is not new and I hear a similar circuit was developed about 40 years ago using germanium transistors. The idea is to connect the lights so that as one turns off it causes the next to turn on, and so forth. This is accomplished with a large capacitor between each stage that charges when a stage turns off and supplies base current to the next transistor, thus turning it on. Any __ Designed by Bill Bowden
Detect Short Xenon Lamp Flashes - This circuit uses a small 2.5mm square photo diode in conjunction with a 100mH coil to detect the short light flashes from a xenon lamp. The coil makes the circuit immune to normal room lights. Its 10mv sensitivity can detect light flashes from a range of over 100 feet. . . . Hobby Circuit designed by David A. Johnson P.E.-February, 2002
Detects Xenon Lamp Flash - This circuit has a very low standby current requirement yet has very high sensitivity toward the light flashes from a xenon lamp. When connected to a flip/flop it can serve as an on on/off Controller . . . Hobby Circuit designed by David A. Johnson P.E.-December, 2004
DIAC-Controlled Flasher - This simple flasher finds various industrial applications as a high-voltage indicator or machine-’on’ indicator. It flashes once every second to give a warning indication. It is simple to design and can...__ Electronics Projects for You
Dice - Press the push switch to 'throw' the dice: this makes the circuit rapidly cycle through the dice numbers so that an effectively random dice number is displayed by the LEDs when the push switch is released. __ Designed by John Hewes
Digitally Adjustable Dancing Lights - You might have come across several types of adjustable dancing lights (flickering LEDs) . Most of them use presets (variable resistors) to adjust the rate of switching. Being a mechanical component, the...__ Electronics Projects for You
Disco Lights - software and hardware for controlling disco lights from your PC
Disco Style Strobe Light - The stoboscope tube needs about 250-400V DC to operate. This high voltage is generated using simple voltage step up circuit built from transistors Q1, Q2 and transformer T1. This circuit gives out about 230V AC voltage which is then rectified with rectifying bridge U1 (must have at least 400V voltage rating) and stored to the main capacitor C1 __ Designed by Tomi Engdahl
Doozy requiring some parts you can't get at the 'Shack. - You can make a doozy of a xenon strobe using the 12 volt DC in, DC output mercury lamp ballast here at http://www. donklipstein. com/ebdc12. html. You may run into a problem with the flashtube arcing continuously after a flash. If you use an open-collector comparator such as a 339 in the overvoltage sensing section of this circuit, you can wired-AND the comparator output with some sort of scheme to disable the circuit for a few to a few tens of milliseconds after a flash (by "pulling down" Pin 5 of the 555) . __ Designed by Don Klipstein
Drive a Complementary Output Stage & Step-Up Audio Transformer - File contains several designs, please scroll to find this circuit. T he following circuit uses the flasher circuit to drive a complementary output stage and step-up audio transformer. This circuit is used in a high voltage breakdown tester but it would be useful for a variety of applications. __ Contact: Charles Wenzel of Wenzel Associates, Inc.
DSP Musicolour Light Show; Pt.2 - In last month's first part, we described the circuit operation of the DSP Musicolour. In this instalment, we guide you through the construction. The operation of the firmware and troubleshooting tips will be described next month. In this issue there are also notes and errata for the schematic published last month.__ SiliconChip
DSP Musicolour Light Show; Pt.3 - In last month's article, we detailed the construction of the DSP Musicolour. In this month's article, we guide you through the final testing of the DSP Musicolour and give troubleshooting tips. We also explain the operation of the firmware in more detail as well as discussing possible accessories.__ SiliconChip
DSP Musicolour Pt.1 - This DSP Musicolour accepts audio input signals and drives coloured lights "in tune" with the music. Its four output channels respond to different audio frequency bands and the brightness of the lights is in direct proportion to the amplitude of the frequency components. A dot-matrix LED menu display is featured on the front panel and this also functions as a spectrum analyser or VU meter.__ SiliconChip
DSP Musicolour Pt.4 - With a small and low-cost add-on PC board, the DSP Musicolour can be operated via an infrared remote controlvery handy if you want to use it in hard-to-reach places.__ SiliconChip
Dual Alternating Flashing Light - This project is best for mounting on a layout to light a crossing or ring a bell. __ Designed by ML Rollins
DUAL- COLOUR STROBOSCOPE - Stroboscope is a device used to make a cyclically moving object appear slow-moving or stationary. This is realised by illuminating the object intermittently with short pulses of light. Stroboscope is used in the study of insect flight. It can also be used for experiments with simple pendulum, studying details of rapidly moving objects and strobo-animation.__ Designed by Raju Baddi
Dual LED Flasher - Some useful circuits using the LM555 IC. Scroll to find the Dual Led Flasher circuit __ Designed by Jose Pino
Dual Tandem Flashing Light-Powered by a 9 Volt Battery - This circuit is powered by a 9 volt battery, suitable for warning lights on a tall structure. (Personally, I can't recommend you buy anything but the Rollins Railroad Designs kit; for $4.00 you can't go wrong. The 555 IC is about $1.50 by itself at Radio Shack) . If you choose to buy all the parts yourself, realize you need ONLY two LEDs, not two of each; you should be able to mix and match colors. __ Designed by ML Rollins
Dummy Alarm - This project makes a superbright LED flash briefly once every 5 seconds to imitate the indicator light of a real alarm. The circuit is designed to use very little current to prolong battery life so that it can be left on permanently. This is a simple project, ideal for a beginner __ Designed by John Hewes |
