Above ” 2 air variable capacitors and a copper clad board screwed onto a piece of wood for my bench musing. Regenerative receivers delight and amaze ” some builders take them very seriously. I respect this, but to me; they should be as simple as possible. I wanted a 2 stage `genny` receiver for this page and present 2 different receivers; 1 is my design, the others is a JFET
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variant of a favorite W7ZOI circuit. Quoting Wes, W7ZOI "feedback your imagination". Some builders place a simple common gate or a common base RF preamp on the input to boost gain and reduce antenna radiation of the RF oscillator, while others place an RF gain control on the input ” usually a potentiometer; to prevent overloading the RF stage. I won`t prescribe what to do ” that`s up to you. There are countless example of regenerative receivers on the web and you can many spend hours viewing them. Some of the most intriguing are those built by Russian speaking experimenters. Example link. Above ” An experimental, ultra-simple "CW" receiver. At 5339 KHz I hear strong Morse code each night. It`s suggested to be from China, but I`m unsure. Connected to my 1/4 wave 40M band vertical - a simple matching network and trimmer tuning capacitor were fitted to the input. Here`s some audio. I like the beat note of this receiver - it has no regeneration control and is fixed for CW. Minimalist circuits are fun ” some hardcore regen builders might freak out; no voltage regulator (here`s a version with that + a T68-6 inductor), no regeneration control (here`s a version with that), a relatively low Q coil etc. I wanted to try my hand at design and not just copy someone else`s receiver. I call it the Stupid ”Simple receiver and although it emits crisp, warm audio, some bench work is required to get the correct bias and appropriate amount of...
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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