This instruction shows how to convert a standard microscope with light bulb to LED light. Only a cheap mobile phone charge can be used as the power supply because of the much lower power consumption of the LED light. Defective original power supplies do not have to be repaired or exchanged. Because a LED does not break, light bulbs are no longer n
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eeded. In our workshop we often encountered problems with broken power supplies of microscopes. The power supplies are usually switch mode power supplies that can not be repaired easily. To supply the light bulb with an external standard power supply is an alternative but such power supplies which deliver 2 A (at 12 V) or even 4 A (at 6 V) are either not available or too expensive, and a dim function is still missing. In the past these microscopes could not be repaired. The solution is to convert these microscopes to LED illumination. White ultra-bright LEDs, especially with a lens, are as bright as common 20W-bulbs, but they only need a fraction of the current. The current needed is so small that common mobile phone chargers can be used as a power supply. Mobile phone chargers are very cheap and commonly available. I admit a white high-power-LED is not (yet) available everywhere. But because they are universal in the usage and only one model fits for all microscope types (and for other purposes) it make sense to order some pieces from Europe or US. In Europe a 1-W LED with integrated lens is less than 10. Ultra-bright LEDs are available in standard 5 mm housings (No. 1). Six to twelve LEDs produce a light which is bright enough (No. 2). But the illumination with just six LEDs could be more homogeneous. The beam angle of 15 -30 ° is not perfect but acceptable. One LED costs 1 W, 3 W and even 5 W-types exist. The LED is...
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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