Two New Versions of Crossing LED Flashers Posted; with Adjustable Speed; all Build Files Included

Rod StewartOGR Forum Member SUPPORTING MEMBERDIGITAL SUBSCRIBER

Back in Oct last year I posted build files for a compact constant speed DIY LED flasher board, here. This new version is the identical basic multivibrator circuit, except it has a small trim pot added, so the flash speed can be adjusted to your liking. It uses all easy to get, and build, through-hole parts. Costs are about $5.75 each for all domestic boards and parts; or about $1.20 each for offshore components. It offers the versatility of either AC or DC power, It can activate leds wired separately, or common anode style, the latter being typical of offerings from Wehonest and JTD. I have built several of these boards and they work very well.

Here is the circuit and 3D View:

The Gerber zip file and User Notes pdf is attached below, along with a pdf version of an excel sheet for choosing the right led ballast resistors.

Have fun, Rod

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AC-DC DIY LED Flasher Module Notes R4.21.pdf

DIY LED Flasher Module with pot R4.21 Gerbers.zip

Values for Resistors R1 & R2 R4.1-2-5.pdf

1/26/202:55 PM

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Rod StewartOGR Forum Member SUPPORTING MEMBERDIGITAL SUBSCRIBER

Here's another adjustable speed LED activator, that will really appeal to the fans of 555 timer chips. It has all the attributes of the board above, but uses the 555 as the timing device. It also includes a small trim pot for speed adjustment. It has fewer components; only nine. Costs are about $5.90 each for all domestic boards and parts; or about $2.20 each for offshore components. It offers the versatility of either AC or DC power. Note that unlike the above board, it CANNOT work with common anode wired leds. The leds must be wired separately to the board.

Here is the circuit, 3D view, and a picture of a finished board: