AM/FM Transmitter schematics
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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...
RF Inductance adaptor for multimeter
The circuit's operating principle is that if you make a pulse width proportional to inductance, and keep the pulse frequency and amplitude constant, and then pass the pulse through a low pass filter so that only the average voltage comes...
ultra miniature transmitter
This transmitter is approximately the size of a large coat button. It accepts direct voice input and operates on a single watch-type button cell, providing several tens of hours of use. The schematic illustrates that this transmitter is likely the...
Receiver for 50Khz FM optical transmitter
This circuit consists of an L14G2 detector, two stages of gain, and an FM demodulator. Better sensitivity can be obtained using more stages of stabilized gain with automatic gain control (AGC).
The circuit design features an L14G2 detector, which serves as...
4 Band Double Tuned Preselector
The circuit requires an RF input, which can be sourced from either a long wire or a loop antenna. The preamplifier operates within a frequency range from 550 kHz (Medium Wave) up to 30 MHz in the shortwave band. The...
SA607 SA607 Low-voltage High Performance Mixer FM IF System
The SA608 is a low-voltage, high-performance monolithic FM intermediate frequency (IF) system that includes a mixer, oscillator, two limiting intermediate frequency amplifiers, a quadrature detector, a logarithmic received signal strength indicator (RSSI), a voltage regulator, and audio and RSSI operational...
remote control sckt
The miniature transmitter module, measuring 34 mm x 29 mm x 10 mm, is designed to operate all remote control receiver-switch combinations outlined in this project. A compact 9-volt PP3 battery can be utilized with the transmitter, which is capable...
500KW Transmitter Schematic
The transmitter was designed with redundancy and cutback (reduced power mode) in mind, giving the transmitter more continuity of service. The final amplifier was divided into 3 separate modules, each using four RCA type UV-898 tubes in push-pull parallel making...
AM IF filter
Typical QRP receivers include Direct Conversion (DC) and simple Superheterodyne types. These receivers often have quite a wide AF bandwidth which can make intelligibility somewhat restricted, especially under difficult QRM conditions. Many commercial amateur transceivers also suffer from this, e.g.,...