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Simple RF Transmitter – Circuit Schematic
Simple RF Transmitter
This schematic is a tone transmitter. For sufficiently small values of the resistor, it outputs a tone, so having a resistive mic (carbon mic) in parallel with ...
VHF Beacon – Circuit Schematic
VHF Beacon
You can cut away the 555 timer oscillator part and add your favorite microphone modulating circuit to transmit voice over to your tv set with a little tuning. S...
Wire Antenna – Circuit Schematic
Wire Antenna
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Wideband AM Radio Receivers – Circuit Schematic
Wideband AM Radio Receivers
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WWV Radio – Circuit Schematic
WWV Radio
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Vertical Antennas – Circuit Schematic
Vertical Antennas
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Variometer Crystal Radio – Circuit Schematic
Variometer Crystal Radio
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VHF Beam – Circuit Schematic
VHF Beam
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TR-55 Radio Sony schematic – Circuit Schematic
TR-55 Radio Sony schematic
TR-55 was the first transistor radio produced and sold in Japan. It uses the following transistors: 2T51 (oscillator-mixer), 2 x 2T52 (for IF), 2T53 (AF driver)...
SV3 Radio Magnadyne Radio – Circuit Schematic
SV3 Radio Magnadyne Radio
Most models produced in the 30s rely on very similar circuits; in particular the RF section of most sets relies on the same LW-MW-SW scheme while the difference...
VHF FM Crstal Set Radios – Circuit Schematic
VHF FM Crstal Set Radios
Phase-sensitive detectors usually take the difference between an input FM signal and the same signal after it has passed through a resonant circuit, or through ...
Triode Frequency Conversion at FM-VHF – Circuit Schematic
Triode Frequency Conversion at FM-VHF
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Servicing old radios – Circuit Schematic
Servicing old radios
A radio that was stored for years on a dusty shelf must be awakened gently to return to its reliable operation and provide us with warm and pleasant sounds for ...
grundig 5040w3d circuitry analysis – Circuit Schematic
grundig 5040w3d circuitry analysis
On the primary winding of the first IF transformer there is no capacitor. Does that mean it has only one tuned circuit, and the primary coil is just an inductiv...
Differential super-regenerative self-limiting FM demodulator – Circuit Schematic
Differential super-regenerative self-limiting FM demodulator
The following is a translation of a section from the first book of the 3 part series "Die RG¶hre im UKW EmpfG¤ng" edited by Dr. Ing. Horst Rothe in 1952. This...
Comments on the Circuits of the first Transistor Radios – Circuit Schematic
Comments on the Circuits of the first Transistor Radios
The circuitry of the Regency shows some peculiarities. The circuit of the self-oscillating mixer stage, the base bias voltage of the second IF stage from the AF...
C-Quam AM Stereo Transmitter Using Valves – Circuit Schematic
C-Quam AM Stereo Transmitter Using Valves
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Bicycle Radio easy and cheap to build (April 1940) – Circuit Schematic
Bicycle Radio easy and cheap to build (April 1940)
This article by Arthur C. Miller was issued on page 88 to 90 in the book "Radio For The Millions" (prepared in 1945 by Popular Science Monthly staff, but first ...
The Defpom RF Preamplifier – Circuit Schematic
The Defpom RF Preamplifier
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The Defpom CB And HAM Circuit – Circuit Schematic
The Defpom CB And HAM Circuit
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