KWM-2 and KWM-2 Transceivers
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Field Strength Meter
This circuit is a wideband signal strength meter designed to respond to small variations in RF energy within the VHF spectrum. It is capable of detecting AM or FM modulation as well as a simple carrier wave. The circuit measures...
Shortwave Monitor
This receiver provides a clear indication of the numerous stations available in the short-wave band and serves as an effective tool for monitoring the ionosphere's condition. The circuit comprises an RF amplifier and an AF amplifier. High-frequency amplification is achieved...
Radio Frequency Circuits
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One Receiver
RF Cafe visitor David M. requested the scanning and posting of an article from the January 1963 edition of Popular Electronics, authored by Philip Hatfield from the Receiving Tube Department of General Electric. The article describes a straightforward design utilizing...
A 40 meter QRP - Transceiver
This was one of my very first transceiver developments. This page was also one of the very first circuit descriptions that I put on the internet quite some years ago. Today I would not build a transceiver like I did...
Grounded Grid Amplifiers
Floating the grid above ground is detrimental for RF performance and arc protection. The connection of the control grid to ground is critical for stability. It is essential to keep the grid connection to ground as wide and short as...
schematic of lenovo e317
Analog baseband digital circuit table of contents: EMI interface, BPI bus, JTAG, LCD interface, keypad, UART, MINT, GPIO, MCP keypad, audio, RF, I/O connector, power cones, serial time, battery charging and analog, LED driver, RF control, JTAG, IOTA, audio codecs,...
Block Diagram of 7MHz SSB (Ham Radio) Transceiver using MC1496 IRF840 and Ladder filter
The microphone amplifier/modulator is built around the LM324, which is a quad operational amplifier that provides sufficient quality amplification for the voice captured by the condenser microphone.
The LM324 is a versatile quad op-amp that consists of four independent, high-gain, frequency-compensated...
HAM RADIO SW RECEIVER
A simple radio receiver circuit is illustrated. This receiver is designed to capture signals from amateur radio stations operating in the shortwave (SW) bands of 10, 15, 20, 40, and 80 meters. The direct-conversion receiver comprises a set of input...