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300 KW MAGNETRON MODULATOR – Circuit Schematic
300 KW MAGNETRON MODULATOR
Trigger is applied to first of four 2-kv switch modules arranged in series, for simultaneous triggering of other modules to furnish 16-kv 20-amp pulse to type 7...
F M MODULATOR – Circuit Schematic
F M MODULATOR
Provides at leaet 200 kc deviation when applied to base of oscillator transistor, before severe distortion sets in. feedback keeps output impedance low. -D. Ene...
NE602 INPUT CIRCUITS – Circuit Schematic
NE602 INPUT CIRCUITS
A few of the many ways to input a signal into the NE602. Simple untuned methods (a and b) are acceptable. If you need to tune to a specific frequency, you can u...
RF MODULATOR – Circuit Schematic
RF MODULATOR
First section of free-running 7413 Schmitt-trigger oscillator runs at one-third of desired TV-channel carrier frequency (about 20 MHz for channel3) and drives b...
AM radio rf amplifier – Circuit Schematic
AM radio rf amplifier
a typical rf amplifier that is used in an AM radio receiver. In figure 2-19, the input circuit is the antenna of the radio (L1-a coil) which forms part of an LC...
RF amplifier coupling – Circuit Schematic
RF amplifier coupling
There are also other methods of coupling signals from one stage to another. Transformer coupling is the most common method used to couple rf amplifiers. Transfo...
Phase demodulation – Circuit Schematic
Phase demodulation
The quadrature-grid signal is excited by a reference from the transmitter. This may be a sample of the unmodulated master oscillator providing a phase reference...
Methods of frequency modulation – Circuit Schematic
Methods of frequency modulation
The circuit shown earlier in figure 2-6 and the discussion in previous paragraphs were for illustrative purposes only. In reality, such a circuit would not be p...
G3XTZ DF Rx Details – Circuit Schematic
G3XTZ DF Rx Details
The receiver is built on a single-sided printed circuit board which measures 2 by 4. 3 inches. The small size means that the board can be fitted into a wide var...
Equipment for Radio Observation of Meteors – Circuit Schematic
Equipment for Radio Observation of Meteors
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The Nuvistor – Circuit Schematic
The Nuvistor
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Variable capacitor and Crystal radio – Circuit Schematic
Variable capacitor and Crystal radio
This should let me select a station by adjusting capacitance in an LC circuit. But, the signal is still modulate it. To demodulate it, I apparently need a secon...
Projects – Circuit Schematic
Projects
This project was inspired by a sense of wanting to build something a little unusual rather than with the expectation that it would become a useful transmitter. ...
The 125 Vacuum Tube Pitch Theremin – Circuit Schematic
The 125 Vacuum Tube Pitch Theremin
The circuit uses AC mains voltage and otherhigh voltages that can cause injury or death. The 125 is a basic heterodyne configuration, in which the outputs of tw...
Tuned radio frequency receiver – Circuit Schematic
Tuned radio frequency receiver
A tuned radio frequency receiver (TRF receiver) is a radio receiver that is usually composed of several tuned radio frequency amplifiers followed by circuits to...
The VHF antenna switch – Circuit Schematic
The VHF antenna switch
Finally I have found a use for a bunch of DIP-style RF relays I acquired in a grab-bag from a discount electronics shop some time ago. These babies are sealed t...
Tesla Coil Design – Circuit Schematic
Tesla Coil Design
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Spark Gap – Circuit Schematic
Spark Gap
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RF transmitter circuit – Circuit Schematic
RF transmitter circuit
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Antenna – Circuit Schematic
Antenna
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