gsm diagram | Next Electronics

This circuit is designed to amplify the input from a telescopic whip antenna. The preamplifier is intended to operate within the medium waveband, covering frequencies from approximately 550 kHz to 1650 kHz. The required tuning voltage ranges from 1 to...

DIY mobile phone jammer Schematic Diagram

A DIY GSM jammer schematic diagram designed to disrupt cellular mobile phone signals operating within the GSM1900 frequency range of 1930 MHz to 1990 MHz. The GSM1900 standard is utilized in the USA, Canada, and most countries in South America....

Wireless am microphone

The transistor Q1 and its associated components form a tunable RF oscillator. The RF signal is directed to transistor Q2, which functions as the modulator. Operational amplifier IC1 amplifies the audio signal and transmits it through resistor R4 to the...

Intelligent home lighting control switch transmitter and receiver circuit

This design aims to create a long-distance wireless remote control switch lighting control system, which consists of a transmission system and a reception system. The system utilizes wireless transceiver modules for RF transmission and reception. The transmitting portion mainly comprises...

Driving circuit schematic

The driving circuit depicted in Figure 18-12 consists of a connection between the driving portion, the microcontroller, and the air conditioning operation components of the bridge. The microcontroller's digital signal levels from ports P4.0 to P4.3 (approximately 12 feet) and...

GSM Based Voting Machine System ECE Project Report

This project involves a GSM-based voting machine system that utilizes AT commands to send SMS through a microcontroller. It operates in two modes: Normal mode, where an authorized individual from a local area can cast their vote, and Security mode,...

The ATL-3 Loop Antenna

All ATL-3 loop windings are centre tapped and balanced w.r.t. their amplifier/receiver chassis ground, and therefore electric field interference pick up tends to self cancel. Magnetic noise fields, e.g. televisions and the electric meter box, or electromagnetically radiated interferences, may...

Active Antenna

Antennas that are much shorter than 1/4 wavelength present a very small and highly relative impedance that is dependent on the received frequency. It is difficult to match impedances over a decade of frequency coverage. Instead, input stage Q1 is...

Robo Atmega328p project

This project was designed to introduce a friend to microcontrollers and circuits using various functionalities and spare parts. A PS2 numpad was utilized as the key entry mechanism, which was found at a thrift store and included the necessary connector....