A simple FM transmitter links your home-entertainment arrangement to a carriageable radio that can be agitated about the abode and into the aback yard. For example, you can comedy music on the CD banker in your active room, and acquire to it on a carriageable radio by the back-yard barbeque. IC1 is a voltage-controlled oscillator with chip varacto
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r. Its nominal abundance of cadence is set by inductor L1, and a 390nH amount places that abundance at 100MHz. Potentiometer R1 again lets you baddest a approach by affability over the FM bandage of 88MHz to 108MHz. Output ability is about -21dBm into 50 (most countries acquire emissions beneath 10dBm in the FM band). The home system`s larboard and appropriate audio signals are summed by R3 and R4, and attenuated by the (optional) potentiometer R2. R2`s wiper arresting serves as a aggregate ascendancy by modulating the RF frequency. Signals aloft 60mV acquaint distortion, so the pot attenuates bottomward from that level. In the absence of a accepted FM radio antenna, 75cm (30 inches) of wire will answer as a transmitting antenna. For best reception, it should be army alongside with the accepting antenna. The IC operates on a distinct accumulation voltage in the ambit 3V to 5V, but you should adapt the activated voltage to abbreviate abundance alluvion and noise.
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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