Wires and electronics freak me out a little. Maybe it has to do with that one time when I was kid and I grabbed an electrified fence with my hand. The voltage was not dramatic enough to knock me out or anything, but I always remember the sharp pain that shot through my body. If it had not been for that experience, maybe I would have chosen the electronic circuit set instead of the giant plastic Godzilla when my Grandpa took me to the toy store way back in the day to pick my own birthday present. Who knows what my life would look like now had I instead grabbed a box like this.
I created an easy circuit for under 20 bucks with ultra bright LED's, small controller box and very long battery life on a single 9 volt battery.
I don't know about the "easy" part, but this is a super sweet looking hack. If you bought that circuit board set as a kid this might be right up your alley. All pictures and text below credited to Tom - Rock On!
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LONG BATTERY LIFE. Circuit is completely turned off when not blinking.
ULTRA BRIGHT LED's
CHEAP, UNDER 20 BUCKS
VERY SMALL CONTROLLER BOX AND WIRING
WORKS ON A SINGLE 9V BATTERY
I made this circuit as a request of a friend.
After a week or so the first prototype was ready. But I was not very happy with it.
To use the indicators you had to turn on the circuit before your trip and turn the circuit off after the trip. The circuit was drawing electricity from the battery the whole trip and when you forgot to turn off the circuit after the trip, the battery would be death the next day.
The circuit was sitting on my desk for 6 months before I started to make some improvements to it.
I contacted a friend who is a Master in electronics to have a look at the circuit. Together we came up with what the circuit is now... a hassles free indicators kit with a long battery life and a small controller box working on a single 9 volt battery.
2 x LED's (I used car LED's working on 12v that I found in a car parts shop for under 5 bucks)
Multi-pole switch, 9v battery connector, 9v battery, Small solder board
555 timer ship + socket, 2 x 240 Ohm resistors, 1 x 100 Ohm resistor, 1 x 500 Kilo Ohm resistor, 1 x 270 Kilo Ohm resistor, 1 x diode 1n4148 or 1n4001 (most standard diodes will work), 1 x capacitor 100 micro farad, 1 x capacitor 1 micro farad, 1 x capacitor 10 nano farad
Housing (for circuit and battery)
Putting it together
If you use ready-to-use LED's, you have to bridge the resistor in the LED casing.
My friend painted the indicators and mounted them to his bicycle.
More info and updates on this project can be found on my website.
And here is a little walk through video on the project.