rc emergency locator alarm circuit

This schematic represents a tone transmitter. When using sufficiently small resistor values, it generates a tone. A resistive microphone (such as a carbon microphone) can be placed in parallel with or replace the resistor, allowing modulation of the tone frequency...

Ophthalmology light lamp switch circuit

This is a remote-controlled light switch circuit that can be used for remote control toys, flashlight operation, or laser pointers. When the light from a torch illuminates the photosensitive resistor RL2, its resistance decreases, causing transistor VT2 to turn on...

RF Actuated Keying Monitor

Sending Morse on a rig without a sidetone is not impossible, but is not particularly pleasant either. This battery-powered monitor has been designed to provide an audible indication of keying for those whose rigs lack a CW sidetone. Its sensor...

Home Automation through Cellphone Keying

This project was developed during a Bachelor of Engineering course to enable remote control of lights and other appliances within a room. The objective was to address the common issue of forgetting to turn off devices such as fans or...

RF Decibel Meter

This is a zine dedicated to electronics circuit diagrams, DIY (do it yourself) electronics projects, electrical electronics data sheets, and microcontroller projects for hobbyists, students, consultants, and product designers. The zine serves as a comprehensive resource for individuals interested in electronics,...

DF data transmission module and the super-regenerative receiver module

The DF data transmission module operates at a frequency of 315 MHz and utilizes a surface acoustic wave (SAW) resonator for frequency stabilization, ensuring high frequency stability. The frequency drift remains minimal, at only 3 x 10^-6, across a temperature...

RF communication use a sample circuit(example in AVR)

Even including labor, the actual cost of purchasing, stocking, assembly, assembly errors, more expensive PCBs (with additional holes and larger sizes), and the increased difficulty in tuning would likely result in significantly higher expenses. The analysis of costs associated with electronic...

RF-powered sidetone oscillator

A sidetone oscillator is a specific type of audio astable multivibrator. Keying is achieved by turning the oscillator on and off through the application of a positive DC potential, which is generated from the RF signal to the reset terminal...

Wifi Robot

A remote control car can be operated over the internet or wirelessly from a laptop up to 500 meters away. It features a live-feed network camera for driving without line of sight and a horn for signaling. The project utilizes...