A simple home project can turn catastrophic fast if you come up against an electric cable, gas and water pipes, or your central heating system. With a handy metal detector you can check beforehand whether there are metal objects in a wall, ceiling or floor. An LED indicates if a metal object is in the vicinity and keeps your simple home projects,
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simple and safe. When wrapping the coils, do not worry about looks. There is not enough room on the core to keep the coils from overlapping. However, make sure you wrap each one in the same direction. When you solder the coil onto the PC board, make sure to strip the insulation off the ends of the coil. Either a razor blade or a fine-toothed file works great for this. For this kit, there are two types of diodes: Silicon (P/N 179215) and Zener (P/N 782788). Because they look the same, read the outer casing to be sure that you are putting in the right diode. The silicon diode has 4148 on it, while the Zener`s casing reads 3V9. I mistakenly exchanged the diodes, and it took a lot of time to figure out I had put them in the wrong holes. Also, make sure to match up the band on the diode to the band on the silkscreen. If you suspect a misplaced or bad diode, measure the forward voltage drop across them, which should be about 0. 6V for each diode. The reverse breakdown voltage for the Zener diode should be about 3. 9V. Be sure to match the flat side of the LED with the flat side in the picture on the silkscreen. Since it can be hard to see the flat side, the short lead on the LED indicates the flat side. If the LED is not turning on, measure the voltage drop across the LED. If it is 0 Volts, you probably have put the LED in the wrong way. The Metal Detector Kit needs a case, especially if you plan to move it around. I chose a...
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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