48MHz Rx
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Tuned Radio Frequency (TRF) Receiver
Superheterodyne receivers have been mass-produced since around 1924, but for reasons of cost did not become successful until the 1930s.
Superheterodyne receivers represent a pivotal advancement in radio technology, characterized by their ability to convert high-frequency signals into lower intermediate...
Wireless Coupler
Here's a way to get a short range bidirectional RF (Radio Frequency) channel on a microcontroller, using the controller's tristatable I/O pins and on-chip comparator with a few passive components. The range with the firmware and simple I came up...
Old Radio Information
This area is primarily characterized by commercial information resellers. A notable exception is Nostalgia Air, which maintains an expanding database of radio schematics. Some links provided here direct to Nostalgia Air's database; however, if the desired information is not found,...
Radio Frequency Circuits
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RF circuits
A field strength meter utilizing a biased Schottky detector employs a temperature-compensated Schottky diode within an amplified, untuned field strength indicator powered by two AA cells. This device indicates the relative field strength of RF fields ranging from a few...
RF oscillator uses current-feedback op amp
A current-feedback amplifier is a well-known component with many uses. Its basic block diagram shows that its input stage is a voltage follower in practice, a symmetrical emitter follower. The configuration samples the output current, converts it to voltage across...
G3XTZ DF Rx Details
The receiver is constructed on a single-sided printed circuit board measuring 2 by 4.3 inches. Its compact size allows for installation in various enclosures, which should be adequately shielded. The main directional signal is captured by a tuned ferrite rod...
Schematic Diagram Anti Theft Car wireless alarm
This is an anti-theft alarm with wireless connectivity, referred to as the Anti-Theft Car Wireless Alarm. The FM radio-controlled anti-theft alarm can be utilized with any vehicle that operates on a 6 to 12-volt DC supply system. The mini VHF...
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...