rf based remote control robot circuit

There are battery-powered wireless systems available, but the ones encountered would indicate that the door was open even if it was left ajar for ventilation. A system was desired that would alert when the door was fully raised. Additionally, it...

valved transmitter for 3.5 MHz

This transmitter project is a highly efficient, rugged, and simple low-power continuous wave (C.W.) unit delivering more than 10W. It is crystal-controlled with stabilized high tension (H.T.) and features a buffer stage between the crystal oscillator and power amplifier stages,...

Transmitter-oscilloscope coupler for CB signals

To display an RF signal, connect LI to the transmitter and points A and B to the vertical plates of the oscilloscope. Adjust LI for minimum SWR and C3 for the desired trace height on the CRT. More: L2 consists...

how to convert a 9v battery to 3.7v

A regulator circuit is needed for this DIY project. Familiarity with electronic components, circuitry, the use of a multitester, and a soldering iron is essential. The schematic diagram provided can accept an input voltage ranging from 6 to 24 volts...

wireless headphones transmitter

This wireless headphone transmitter ensures a reliable connection over a distance of 2 meters. The oscillator frequency ranges between 1750 KHz and 3500 KHz, utilizing a ferrite bar as the antenna. IC1 amplifies the audio signal, while TC1 serves as...

Telegraph Transmitter in the Pilot Radios Radio Design magazine 1930s

The TPTG transmitter has been transformed into a modern TNT model. This transmitter can utilize the existing K-111 power pack for both the transmitter and receiver, eliminating the need for a separate power supply unit. Building this compact transmitter allows...

Cellphone Operated Land Rover (Mobile Phone Controlled Robot)

Cellphone Operated Land Rover (Mobile Phone Operated Robot). In this project, the robot is controlled by a mobile phone that makes a call to the mobile phone attached to the robot. The cellphone operated Land Rover project involves the design and...

Wireless IR Headphones circuit

This wireless infrared (IR) headphones circuit project enables the transmission of audio signals through an infrared connection. The circuit consists of two main components: a transmitter and a receiver. Unlike radio frequency (RF) transmitters, both parts of this application must...

Accident Prevention and Security System for Automobiles

This is a remote-controlled land rover that can be operated using a cell phone. This allows the user to move the land rover by sending various commands from their device. The rover can be controlled from virtually anywhere in the...