Radio-frequency schematics
#RF
#transmitter
#receiver
#antenna
#frequency modulation
#signal processing
#wireless communication
#radio waves
#circuit design
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Active Antenna for Medium Wave
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...
active short wave antenna
The circuit presented illustrates that despite the availability of various new components and technologies, it remains feasible to design useful and interesting circuits. The circuit utilizes two well-established transistors, the BF256C and the BF494. Along with the necessary resistors and...
Transmit Time Limiter
This circuit prevents transmissions that are too long, which can cause timeouts in repeaters and/or occupy a communication channel for an excessive duration. During transmission, the PTT (push-to-talk) line from the microphone is grounded, resulting in one input of the...
Antenna selector circuit diagram electronic project
This antenna selector circuit diagram electronic project is constructed using standard electronic components and facilitates the switching between two FM antennas through a logic signal. The gates IC1b and IC1a manage the switching and interface between the required logic levels...
80M And 40M Cw-Ssb Receiver Circuit
This direct-conversion receiver utilizes a TDA7000 integrated circuit (IC) and incorporates an LM386 audio amplifier. The TDA7000 serves as the mixer and local oscillator (L.O.) section. The frequency control can be achieved using either an air variable capacitor or a...
Simple RF Transmitter
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...
GBPPR 1 GHz RF Spectrum Analyzer
An RF spectrum analyzer is an essential tool for experimenters. The spectrum analyzer project described here is an enhancement of the "Spectrum Analyzer for the Radio Amateur" (Part 2) project by Wes Hayward (W7ZOI) and Terry White (K7TAU), which appeared...
Miniature MW Transmitter
Here is a very simple, inexpensive and interesting project which provides lot of fun to a home experimenter or hobbyist. This simple transmitter can transmit speeches or songs within a short range. The circuit uses only one transistor. The entire...
20M Cw Transmitter Circuit
The transmitter features a VXO circuit that drives a keyed amplifier. This keyed amplifier powers an MRF 476 final amplifier, producing approximately 2 watts of output. Additionally, a solid-state T-R switch is incorporated for the receiver. The component values provided...