LED Flasher High Visibility

thingiverse

I wanted a high visibility flasher to turn on while I ride from the train station to the office. I simplified citrofan's design by removing a lot of the vertices so it is easier to modify the lid and the box mount points. I also stretched it vertically a bit so you can fit the LEDs mounted int the lid and a 9V battery. My first attempt at the used a relay circuit, which ate batteries even when I did remember to turn it off. This new version uses 2 transistors and much less power. Parts List 9V battery and connector 2 x 100 ohm resistors 2 x 100 Kohm resistors 2 x 10 uF capacitors 2 x 2N3906 transistors (or equivalent) 16 x 2x3x4 high brightness LEDs 1 x SPST slider switch 2 x zip ties The detail for the transistor circuit is here: https://www.eleccircuit.com/dual-led-flasher-by-2n2907/#Dual_LED_flasher_circuit_using_PNP_transistor Changing the capacitors and the resistors will allow you to speed up or slow down the alternating LED arrays. Best to experiment on a breadboard until you have what you want. if you are curious about the relay circuit, you can search youtube for "Relay LED flasher" -- I used a GEO 3F-12V3 relay but again, this circuit used way too much power.