I designed the simplest remote-controlled autocue system possible with materials that i unburied from my old-and-busted bin, my old P4 laptop, a totally broken USB keyboard, a piece of plexiglass. A foot-switch controls the scrolling of the text in the autocue screen. The first revision of the BJT Transistor Theory e-book has been released. One ma
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jor error have been corrected in one image (thank you Nash). The first chapter has been re-written. Download and share for free. I used a piece of aluminum to mount the hot air gun on the carriage, and also i improved the coupling of the stepper motor with the threaded rod. The rod now revolves smoothly, there is no grinding sound from vibrations and the motor stays in position. Heading towards an end, i mounted the stepper motor and the driving pair, an M6x1 threaded rod with an M6 nut will do the job perfectly and with an easily calculated step (1mm per cycle = 1mm per 200 motor steps = 0. 1mm per 20 steps) The soldering reflow process is usually the only way to go if QFN packages are used. To properly reflow a QFN one has to follow a reflow chart provided by the manufacturer. The process takes some 6 to 7 minutes to fulfill, which is a lot for doing it by hand. Plus it is not easy for one to follow the temperature chart precisely. Therefore, i built this NC machine to do the reflow job automatically. I wrote the second page of the first circuit to support the TEDIE Book. In this page I take some measurements on the DC Transistor load switch. More calculations are coming up next. Some time ago I uploaded a video explaining how one can remove the various components from an old PCB fast and easy. It seems that many people misunderstood the purpose of this video. One gains more than just economical profit from salvaging...
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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