The problem with this monitor is that the power supply for the vacuum tube back lighting dies. The first step is to totally disassemble the monitor into little pieces, then carefully remove the gold colored trays that hold the vacuum tubes. Then carefully remove the tubes themselves without breaking them, like that can be done. The LED`s are spaced at about 1/2 inches apart by using the edge of a cardboard box as can
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be seen below. This was the test setup using a 9 volt battery, the LED`s are spaced every three holes from each other. The LED`s are wired in sets of 3 with a 12 ohm 1 watt resistor in series with all of the sets of three LED`s. A 10 ohm to 15 ohm resistor would work just as well. This is what the LED`s look like in the tray. They have to be angled at a 45 degree angle towards the back of the screen in order to fit and it is a very tight fit. I tried to use a flat front LED so it could aim directly up at the screen but did not see any increase in brightness. This is what it looks like with the bottom tray full of LED`s. There are a total of 27 LED`s in the bottom light tray in this photo. There needs to be about 27 LED`s in each of the trays. The dark areas are where the resistors are located. I no longer put any resistors in the tray for that reason. As you might be able to guess the labor far exceeds the value of the fixed monitor. Also you can see in the photo above that unless you space the LED`s so they are almost touching each other then there will be blank spaces between them. The ideal solution would be surface mount LED`s on a circuit board to provide continuous lighting. The picture below shows what it looks like compared to a laptop. As you can see it is not as bright and the picture has a purple color to it. Even thought the color looks white to the eye it is somewhat blue by comparison. The LED`s used were 3mm...
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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