The JarLight is a small flashlight based on a white light emitting diode (LED). It is powered by a single battery cell. This combination enables a very compact case at a very high light power and long-life. Not only of the battery but also of the LED. To generate a voltage of 4 volts out of a single 1. 2 volt cell it is necessary to make use of a
Click here to download the full size of the above Circuit.
little circuit, based on the LT1073-5 IC, a coil, a diode and a capacitor. It`s easy to build and you find the circuit further down. To compare the features I used a MagLite Solitaire because this flashlight is comparable in size and power (one cell only). The photographs show the light-cones of the two flashlights as seen from the side and as a reflection of the circle on a white sheet of paper. Beside the light-power the battery-usage is interesting too. I have charged one and the same 750mAh micro-accumulator cell (size AAA) with a microprocessor controlled battery charger and used it for the test. Above you see the circuit schematics of the JarLight. The LT1073-5 IC is being produced by Linear Technology. You can find a verbose datasheet on their pages too out of which I derived the circuit above. The coil with 82 micro Henry can of course be substituted by a serial combination of two smaller coils. I use two inductivities of 10 µH and 68 µH successfully. According to the datasheet of the diode must be a very fast one. So the 1N5818 Schottky-diode is recommended. The capacitor is not necessary for using the circuit above as a LED driver but it produces a nice after-glow when switching off the current. On the right side you see the inner "life" of the JarLight. IC, inductivities, diode and capacitor find their place on a small circuit board. The inductivities are "cloaked" in resistance-casing right.
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.....
characters left: