QRP Antenna Tuner
Posted on Jan 29, 2013
New Circuits
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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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The Clock Controller was designed to be an exemplary of using 'C' language to control...
Most audio amplifier systems must have preamplifiers with many different characteristics. These...
This circuit will record commentary and/ or music on one track of a tape and put the beeps that...
This accessory connects to phone and will activate an attention-getting 120-V bell whenever a...
This is a programmable clock timer circuit that uses individual LEDs to indicate hours and...
Here is the circuit diagram of simple and easy subwoofer filter which will be operated from a 12V...
To me the E1T counting tube is unmistakably one of the most intriguing tubes ever made. It was...
A simple pulse generator with a variable duty cycle and frequency is often useful in the lab to...
A laser trip wire that actuates a camera. An ambient light sensor by Vishay, the TEMT6000 [...
This solid-state push-pull single-ended Class A circuit is capable of providing a sound...
This circuit features automatic exit and entry delays - an optional instant alarm zone - an...
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