• on Miscellaneous Electronics
  • Published in issue 12/2004 on page 0
About the article

Unusual LED Blinker

Unusual LED Blinker
This LED blinker manages with only a few components and is dimensioned to operate from an ac supply in the range of 4–16 V (6–24 V dc). As its current consumption is less than 1 mA, it’s also suitable for long-term battery-powered operation. It thus offers several advantages in various applications, compared with using the well-known 555 timer IC as an astable multivibrator. Depending on the values of the timing components, the blinking rate ranges from 1 to 1.5 Hz. Although the duration of each blink is only a few milliseconds, a high brightness level is achieved by using a relatively high LED current. There are numerous potential applications for this circuit in model railway systems, in both stationary and moving equipment.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

R1 = 22kOhm
R2 = 10kOhm
R3 = 68kOhm
R4 = 22Ohm
C1 = 47µ F 35V
C2 = 10µ F 25V
D1 = 1N4148
D2 = low-current LED
THR1 = BRX45
PCB, order code 040056-1 from The PCBShop
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