RXTX V6.3 RX Switching circuit

Anyone performing their own automobile tune-ups knows how important it is to know your engine's speed. With this tachometer, you can measure your engine's speed without any connections or annoying timing lights. The described tachometer is a non-invasive device designed for...

6 Channel RF Remote Control

This project creates a simple but valuable wireless remote controller. It has as many as 6 channels (a rare feature for remote control devices) and transmits encoded MM53200, UM3750, or UM86409. Of course, you can omit the button and make...

remote control mains switch

As the only electronics engineer in the family and circle of friends, it is sometimes challenging to decline requests for assistance. Recently, a friendly elderly lady in a retirement home sought help regarding her lighting situation. In her room, the...

Remote Control Operator

Remote-controlled light switches are increasingly popular. DIY stores offer affordable sets that include multiple light switches and a remote control unit, allowing users to manage lighting from their armchairs. However, controlling the lighting while away from home can be a...

Simple Low-Frequency Receiver

Using an NE602 heterodyne detector and U1 as an RF amplifier, this receiver tunes the middle portion of the low-frequency spectrum from 150 to 250 kHz. U2 is a loudspeaker amplifier. The described circuit employs an NE602 integrated circuit as...

80 Watt stereo transmitter

This transmitter was designed from the ground up to provide very high sound quality, coupled with excellent frequency stability, reliability, etc. It can be used as a standalone transmitter to serve a medium-sized town, or as an exciter to drive...

472 kHz Transmitter

The exciter board is based on an Arduino WSPR exciter. Plans are underway to create a more advanced stand-alone board using inexpensive Chinese DDS modules available from eBay. Currently, a DDS60 by AmQRP is being utilized. The output from this...

Remote Control Mains Switch

The request for assistance came from an elderly lady in a retirement home. In her room, the light switch by the door and the pull cord above the bed control the ceiling light fitting. However, she prefers to operate her...

Wireless Fm Microphone

A simple FM wireless microphone utilizes a single BC183C transistor as an audio amplifier, with the option to substitute it with a 2N3565. The transistor Q1 functions as an oscillator that is frequency-modulated by the signal from Q1. Other transistors...