Radio Frequency Circuits
Posted on Feb 6, 2014
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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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This complete high quality, low noise mono audio power amplifier is based around the Hybrid...
A 10 bit scanning voltmeter with a Minimum Mass Wireless Coupler, based on the ATMega8.Range to...
Typical QRP receivers include Direct Conversion (DC) and simple Superheterodyne types. These...
The circuit is not frequency sensitive. Its calibration will be accurate over a wide frequency...
An LED - light emitting diode is used to illuminate keypads keys and LCD screen displays on all...
Make a 555 timer base circuit such that O/P pin of 555 is held LOW by default at power on, and...
A prototype model of Agriculture Based Robot . Till recently the farmers were using age-old...
A simple battery charger based on SCR is shown here. Here the SCR rectifies the AC mains voltage...
Applications 900 MHz ISM Band, Satellite TV LNB IF Amplifiers (950 - 2150 MHz), 1575 MHz GPs 2. 4...
BC547 transistor. Max operating current is 100 mA while max voltage is 65 volts. With the...
Here is another little circuit I designed for radiation logging purposes. It is based on an Atmel...
As shown in a practical single-tube constant current charger, which play a constant role...
Control button switches SB1-SB4 can be installed in different positions corridor, just move SB1 ~...
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