The circuit I used is a very common one. You can do a google search for 555 timer LED blinker and find hundreds of schematis that will fit the bill. Here is the schematic for my particular flavor of LED blinker: The variable resistor (100K) in the schematic above may not be included in other designs with a fixed blink rate, I included it here so that the blink rate
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can be user adjustable from about 1hz to several hundred hertz. I didn`t include mounting hardware in the parts list because you will need to do some thought on your own to decide how your enclosure will attach to your particular bicycle. My bike has a small metal piece above the rear tire with holes in it, so it was only logical to attach my enclosure here with a nut and bolt. Wire this circuit up on your perfboard and insert it into your enclosure. Mount it on your bike and you`ll hopefully have something like this! Make sure you wire your LED`s in parallel! I had been testing the circuit on my breadboard with a 9v DC wall adapter as the power supply, this is slightly different from using a battery, as it will deliver ~14v to a lightly-loaded circuit. I had wired my LED`s in series, and with the wall adapter everything worked fine. However, when powered by a 9 volt, the four LED`s I had wired in series dropped more voltage than the 9 volt could deliver, so the circuit failed to operate. The easy fix for this is of course to wire the LED`s in parallel, so that collectively they can only drop the same voltage as a single LED would (which is ~1. 5 volts). You can see how everything is laid out in the enclosure in the photo above. I soldered the circuit to the perfboard before cutting the excess off with a Dremel. The screw holes on the board don`t line up with the holes in the enclosure perfectly, so I only used one corner...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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