Another project started with three others not finished. What would my Dad say Well one thing he would say is, `Warn people that this project is under construction and has not been proved to work yet`. You have been warned. I had to use a signal generator, resistor, and oscilloscope to measure the value of an inductor for my battery-charger projec
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t. That was just irritating. So, after looking for a reasonably priced L-C meter and finding none, I started looking at articles for building one. There are many on the net, but I picked a circuit by Iulian Rosu. It looked the best for checking all sizes of inductors with minimum errors due to resistance and core saturation. The capacitance meter was thrown in for convienience and does not pretend to be a circuit in the league with a Gary Novak`s femto farad circuit. It is just a simple capacitance checker. If you look at the schematic below you will see that it is just a re-drawn version of the schematic for Iulian Rosu`s adapter shown in the qsl. net webpage. I added one more position to the range switch to go to 20mH. There is probably a good reason why the increase in range won`t work. I am hoping it is just accuracy. At 20 mH I am just looking for a range confirmation, not an actual measurement. The other change I made to the inductance adapter circuit was to add a 10X gain stage after the detector. I wanted the inductance and capacitance adapters to use the same voltmeter scale and the capacitance adapter did not work so well on the 200mV scale. Oh yes! I also had to change the clock to a 3. 2MHz oscillator with division down to 100kHZ. It was more cost effective (cheaper) to use the 3. 2MHzcrystal and a 4060 IC than to buy a 100kHz crystal. The capacitance circuit is a triggered one-shot that is driven by the crystal...
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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