A dual alternating flashing light circuit:  (electronic circuit added 4/05)

A dual tandem flashing light circuit Powered by a 9 Volt Battery:  (electronic circuit added 4/05)

Adjustable Flashing LED:  ASCII format (added 7/02)

Adjustable Strobe Light:  120-Volt mains power source, up to20 Hz flash rate (added 4/02)

Alternating Flasher:  This circuit uses three easily available 555 timer ICs. All three work as astable multivibrators. The first 555 has an on period and off period equal to 1 sec. This IC controls  on/ off periods of  or 2 555s which are used to flash two bulbs through  relay contacts. The flashing occurs at a rate of 4 flashes per second. The diodes are used to protect  555 ICs from peaks. The relays should have an impedance greater than 50ohms i.e, y should not draw a current more than 200mA....   (added 10/05)

Alternating LED Blinker uses Four Parts:  03/26/98 EDN-Design Ideas  /  (added 2/03) /Grand Prize Winner 1998 -The circuit in Figure 1 is an easy-to-make attention-getter and runs for a week or longer on two AA cells. In September, I used this circuit for a school fundraiser, and it helped me generate more than $100. My dad showed me a circuit in EDN that did  same thing, but it uses more parts (see "Alternating LED flasher uses minimal parts," EDN, Nov 20, 1997, pg 104)....

Alternating LED Flasher uses Minimal Parts:  11/20/97 EDN-Design Ideas / (added 6/062)   -A pair of alternating flashing LEDs makes an excellent visual alarm, this alternating LED flasher is based on one LED with built-in flashing function and two transistors driving  or normal LED

Alternating LEDs  Flasher:  (electronic (schematic / circuit added 4/02)

Automatic Grade Crossing Flasher Circuit:  (design added 8/03)

Back and Forth Flasher:  for16 LEDs (added 4/02)

Basic Flashlamp Illumination Circuitry for Cellular Telephones/Cameras:  DN345  Design Notes (Linear Technology) (app note added 6/06)

Basic LM3909 LED Flasher:  runs from1.5-Volt battery (added 3/03)

Beat Tracking Strobe:  project description using AT90S8515 microcontroller and some electronics (added 5/03

Bicycle Back Safety Light:  Flashing13 LED unit,3V supply Also suitable for jogger/walkers (added 9/04)

Brakelight Flasher:  This is basically a flasher circuit modified to turn on and off a bulb instead of a LED. It uses a 555 timer IC working as an astable multivibrator. The flashing rate can be varied from very fast to a maximum of once in 1.5 sec by varying  preset VR1.  The ON time of  circuit is given by: TON= 0.69xC1x(R1 + VR1) second and  OFF time is: TOFF= 0.69xC1xVR1 second  You can increase  value of C1 to 100uF to get a slower flashing rate of upto once in 10 sec.   (added 11/06)

CD strobe scope:  This is a strobe scope. The disc is rotating but it looks still.  (added 10/05)

Cellular Phone calling Detector:  Flashes a LED when detecting an incoming call.  Powered by one 1.5V cell  (added 4/05)

Circuit forms fast portable light pulser:  10/16/03 EDN Design Ideas  /  (added 02/05)  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....

Color Organ #1:  make different colored bulbs light at different frequencies of music, connects to speaker outputs (added 4/02)

Color Organ #2:  one lamp color organ (added 4/02)

Colorsound Supasustain:  (circuit added 11/06)

Colorsound Tone Bender:  (circuit added 11/06)

Constant Brightness LED Stroboscope: for Measuring the Speed of Small Motors :  The rotary switch is available for $5.00USD as of 2003 from DigiKey under part number EG1951-ND or EG1952-ND. It is a real pain to operate this circuit without a proper switch. You can put multiple 4017 ring counters in series to reduce the duty cycle in order to obtain a more focused strobe image but you will have to increase LED current to maintain the same level of brightness and that will shorten LED life. This circuit can be improved a bit by using a more stable STROBE RATE oscillator or by using a regulator to power the oscillator and associated logic. If you do this you should switch to 74HC class devices.   (added 2/05)