Crystal Radio II
#crystal radio
#germanium diode
#1N34A
#RF receiver
#AM radio
#passive receiver
#radio circuit
#detector circuit
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SA1135 AM RADIO IC FOR DIGITAL TUNING SYSTEM
The SA1140 is an intermediate frequency (IF) system integrated circuit (IC) tailored for FM car stereo receivers. It offers adaptable muting characteristics that can be modified using external components. Manufactured by Silan.
The SA1140 is engineered to enhance the functionality of...
The Simple AM Broadcast Band
This is a crystal radio circuit that features a simple design but is ineffective in tuning to the medium wave AM broadcast band. Component: Antenna.
The crystal radio circuit operates on the principle of radio wave detection using a crystal detector,...
am radio
In a previous article on constructing a radio, a simple crystal radio receiver circuit was discussed. The schematic presented here is also a straightforward AM radio circuit; however, it does not utilize a crystal but instead employs a high-gain preamplifier...
Basic Crystal Radio ReceiverCircuit by Elmer G. Osterhoudt
A crystal radio receiver is a very simple radio receiver that requires no battery or external power source, operating solely on the energy harvested from radio waves through a long antenna.
A crystal radio receiver is a passive radio receiver that...
Simple Pyro RF Receiver (27 MHz) - Signal Mixing
Following the functionality of the standard regenerative front-end receiver circuit, initial output from the transmitter can be observed. The first point of interest in the schematic is located immediately after the LC tuning circuit and the DC blocking capacitor. The...
Free-Power AM Radio
Here is something that may interest crystal radio builders: a one-transistor (silicon) AM broadcast receiver that derives its power from ambient AC hum and static. The schematic is adapted from Darryl Boyd's "Stay Tuned" website, which features over 170 articles...
Repair Notes for Bendix Model 3TBD AM Radio
The chassis externally resembles the 22BD model, with the exception that the 22BD features a jack for speaker connections—two female sockets—located on the right (antenna) side. In contrast, the 3BTD model has a 3-inch harness (black and green wires) that...
Crystal radio schematics
The fundamentals of crystals have not changed since this article appeared in a 1960 edition of Popular Electronics. The methods for growing, cutting, and packaging crystals have evolved significantly. Understanding their operation at the atomic level has also advanced considerably....
Selective Frequency Crystal Radio
The coil on the left is coil #1, and has 17 taps. The other coil is coil #3. The vertical strips are the lath material, screwed to the 1 foot long base. Holes drilled in the ends of the lath...