introducing super het receivers
#superheterodyne
#RF receiver
#radio
#frequency mixing
#intermediate frequency
#tuning
#demodulation
#amplification
#signal processing
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Desheng 89701 type radio small shortwave Wang schematic
The circuit diagram for the Desheng 89701 type radio, a compact shortwave receiver, is provided below.
The Desheng 89701 is designed for shortwave reception, making it suitable for capturing a variety of radio frequencies across the shortwave band. The circuit typically...
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...
Interpolating Scanner Circuit
This design is for an interpolating scanner, a circuit featuring multiple signal inputs, a control voltage input, and a signal output. The output selectively transitions between inputs, smoothly fading from one to the next as the control voltage increases. A...
12kHz IF signal generator circuit diagram
The circuit depicted is a 12 kHz intermediate frequency oscillator designed for an alarm system. It employs a variable feedback oscillation circuit where the oscillation frequency is primarily determined by a quartz crystal. Capacitors C1 and C2 are used for...
Old-Time Radio
This circuit was utilized in the early days of radio for signal reception. It can employ nearly any battery-operated triode, such as a type 30. The "A" battery provides 3 V, R2 is a 100-ohm rheostat, and the coils are...
Radio remote control circuit
The receiver circuit depicted in the figure requires the insertion of a plug into the radio headphone jack. When the radio receiver detects a signal from the transmitter, an audio signal is output from the jack. This signal is then...
Energy-sucking Radio Antennas
Here's something that has always bugged me: light waves are about 5000 Angstroms in wavelength, while atoms are more like 1 Angstrom across. Atoms are thousands of times smaller than light waves, yet atoms obviously interact very strongly with light....
Multi Channel Remote Control System
This is a hobby circuit for a multi-channel remote control system that allows the control of eight different appliances. The primary components of this multi-channel remote control circuit are the RF receiver and transmitter. By utilizing this circuit, it is...
Interfacing MaxTrac Mobile Radios to Repeater Controllers
This article outlines a reliable, straightforward, and universal method for interfacing Motorola mobile radios from the MaxTrac, Radius, and GM300 series with common repeater controllers. The information provided is also relevant for radio interfaces used in IRLP or EchoLink applications....