27Mhz and 49Mhz rf oscillator-transmitter
Posted on Jul 12, 2012
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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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On the initial part of the positive half cycle, the voltage is changing rapidly from zero causing...
CI capacitor in series with the crystal may be used to adjust the output frequency of the...
The 555 on the right is wired as an alarm sound generator and the second 555 timer on the left is...
We introduce an inverter today mainly by the MOS field effect tube, the ordinary power...
The circuit shown above can be used to control a unipolar stepper motor which has FOUR coils...
This circuit was designed to protect a dual rail power supply from shorts across the two rails....
You may be wondering why I am using four tubes. The reason is to get 50 watts without pushing...
This optical trigger is a general purpose module for use with `standard` 3mm package infrared...
The 900 Hz tone is generated with an LC-oscillator. The "L" part of the "LC" is provided by the...
The congestion of the ether is becoming so great that efforts are continually being made to...
The thermometer meter slinger circuit is composed of power supply circuit and meter slinger...
With bass boost compensation for the practical power amplifier circuit. Follow the instructions...
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