Light Flasher Circuits   Page 2
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Last Updated on:
Tuesday, October 28, 2014 05:27 PM


Circuits Designed by Dave Johnson, P.E. :
  • AC LINE POWERED LED FLASHER NUMBER 3
    Some of the latest LEDs are amazing.  They can produce a surprising amount of light with very little current.  In the light flasher application shown below I take advantage of a nice surface mounted LED from King Bright.  This flasher circuit draws only about 3ua of average current from the AC power line to flash this green LED.  This flasher might be used as a power indicator light....
  • Battery Free LED Flasher
    LED flashers have been used for a wide variety of applications.  Some flasher units have been used in food and hardware stores, to draw attention to sale items and are often attached to boxes which dispense product discount coupons. Typically, as the illustration below depicts, these simple units have a red LED, on each side of the housing.  Inside, is a battery and flasher circuit
    ....
A Dual Alternating Flashing Light Circuit -  This project is best for mounting on a layout to light a crossing or ring a bell. (electronic circuit added 4/05)
A Dual Tandem Flashing Light Circuit Powered by a 9 Volt Battery -  (electronic circuit added 4/05)
AC LINE POWERED LED FLASHER NUMBER 3
Some of the latest LEDs are amazing.  They can produce a surprising amount of light with very little current.  In the light flasher application shown below I take advantage of a nice surface mounted LED from King Bright.  This flasher circuit draws only about 3ua of average current from the AC power line to flash this green LED.  This flasher might be used as a power indicator light....(Circuit of the Week designed by David Johnson, PE)
Adjustable flashing LED -  Use a 555 timer IC as the ASCII format  (resistor controlled) frequency source, choose component values to run at 2 x desired flash rate, get the data sheet for this part, it's pretty comprehensive. Use the output to clock a flip flop ASCII format  (e.g. 74HC74). Feed flip-flop Q and /Q outputs to simple transistor stages, vizASCII format  (circuit added 05/06/07)
Adjustable Strobe Light -  120-Volt mains power source, up to20 Hz flash rate (added 04/03/02)
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 the on/ off periods of the other 2 555s which are used to flash two bulbs through the relay contacts. The flashing occurs at a rate of 4 flashes per second.....

Alternating LED Blinker uses Four Parts -  03/26/98 EDN-Design Ideas...../Grand Prize Winner 98 -The circuit in Figure 1 is an easy-to-make attention-getter and runs for a week or longer on two AA cells. In October, I used this circuit for a school fundraiser, and it helped me..... [Design Idea by Andy Meng, Cincinnati, OH]
Alternating LED Flasher uses Minimal Parts -  11/20/97 EDN-Design Ideas.....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…. [Design Idea by Dennis Eichenberg, Parma Heights, OH]
Alternating LEDs Flasher -  Classic astable multivibrator using 2 transistors. Transistor is not critical. Try these: 2N4401, 2N2222, NTE123A, NTE123AP, NTE159, TUP/TUN and those in your junk box, you may find that most of them will work.… [Tony van Roon's circuit]
An LED Flasher with a Slow Rise & Fall Time -  A Simple Circuit Using a 555.....(design added 12/08)
An SCR Flipflop  for Alternating Flashing Light Bulbs -  ….(electronic schematic added 12/08)
Astable multivibrator (blinkie) -  A pulse generator, or astable, circuit can be made using four resistors, two capacitors, two LEDs and two transistors. 'Blinkie' uses these components to form a face, with the flashing LEDs representing the eyes. (electronic design added 08/08/08
Automatic Grade Crossing Flasher Circuit -  The circuit on this page provides realistic operation of the flashing signals at a level grade crossing. The circuit uses six photo transistors to control the operation of the flashers and can easily supply up to four sets of LED flashers ( 8 LEDs). [from Rob Paisley's Model Train web site]

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