In order to understand how the following circuits are connected to each other you have to read the concept chapter first. Of course it is up to you to take just one or two of these circuits for your own developments. Lets start with the 6 MHz oscillator. The highest priority in this circuit is its long term frequency stability. You might be surpri
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sed about the many buffer stages. I tried to make sure that the output frequency is 100% independent of the circuit load (and it seems that I even overdid it a little bit). Now we will have a look at the 36 MHz oscillator. It turned out that the shunt diode increase the phase noise. Therefore I recommend to skip it. The 22pF coupling capacitor can be increased to 27pF which gives a bit more tuning range. All capacitors in the resonator (i. e. between the BB204 and the J310) should be "zero temperature drift" types. The trimming capacitor is a silver-air-trimmer, but the long term stability will not decrease a lot if you use a cheap trimmer since the influence of this capacitor is quite small.
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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