PT2272 Remote Control Decoder
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Simple Direct Conversion Receiver
A low-cost continuous wave (CW) superheterodyne receiver operates with a 4.00 MHz intermediate frequency. While there is no automatic gain control (AGC) or RF gain control, the receiver demonstrates good large signal handling capabilities. The design incorporates six bipolar transistors...
RF Based Wireless Remote Control Switch
It is often necessary to control electrical appliances remotely, even when there is no direct line of sight between the transmitter and receiver.
In modern electronic applications, remote control systems are increasingly utilized for various purposes, including home automation, industrial control,...
4 Band Double Tuned Preselector
The circuit requires an RF input, which can be sourced from either a long wire or a loop antenna. The preamplifier operates within a frequency range from 550 kHz (Medium Wave) up to 30 MHz in the shortwave band. The...
Simple RF Power Meter
Many beginners trying out their skill with QRP TX for the first time have to overcome many problems before they are able to come on the air. One usual complaint is that everything is working fine, but the signal is...
Wireless-fm-microphone
An adjustable capacitor C10 and a coil L1 create a tank circuit that, along with Q1, C2, and R1, oscillates at a frequency within the FM band. The center frequency is adjustable by tuning C10. An electret microphone, M1, captures...
RF based Automatic meter reading
RF based Automatic meter reading, or AMR, is the technology of automatically collecting data from energy meter and transferring that data to a central database for billing and/or analyzing. This means that billing can be based on actual consumption rather...
Four channel RF remote control
This is a simple RF transmitter circuit utilizing the Holtek HT-12E encoder chip and an AM 418MHz transmitter module (WZ-X01). The use of hybrid RF transmit/receive modules simplifies the construction of the RF remote control. The transmitter can operate with...
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...
Remote-Control Analyzer Circuit
A schematic diagram for the remote analyzer is presented. The circuit is powered by a simple 5-V supply, which includes components such as PL1, SI, Tl, a bridge rectifier formed by diodes D1 through D4, capacitor CI, and a standard...