This project started from seeing pages describing arcstarters that could be constructed for practically no cost from stuff just laying around in the typical tinker`s shop. It has been a fun project, but I have a basement crammed full of stuff and I still had to spend over $600 to build the thing. My arcstarter section runs at 300kHz, uses Miller a
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rc points, a homemade ferrite core coil/transformer, homemade multi-capacitor modules for the filter and tank capacitors, and generates a tremendous amount of radio-frequency interference. I guess you would say it is a typical homemade arcstarter. On the other hand, the power control section is not typical of homemade circuits. Power control is linearly contolled from zero to full power at no, partial, and full current. The circuit uses zero-crossing detection and multi-pulsed gate triggering to ensure symetrical firing of a reverse-parallel SCR module. Making a decent looking case has always been the slowest part of a project for me. I use to have access to a metal working shop, but now I can only do it at home. So my case started as a computer case that I cut down to a size close to the size of my arc welder. The arcstarter section is on the left. I wanted to put the arc points at the rear so I could adjust them by removing a panel. Due to the available space, I had to move the arc points to the side. This location also provides a way to incorporate the ceramic tile insulator into a plenum to cool the points and keep the UV light from the point arcs away from eyes. A fan at the front cools the tank coil secondary and the MCM. The cooling air then is divided, with part flowing past the arc points, and part flowing over the heat sink for the power control SCR module. Control of the arcstarter and the welder is on the 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.....
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