radio receiver using the zn414
#ZN414
#radio receiver
#RF
#AM receiver
#tuner circuit
#demodulation
#wireless communication
#signal processing
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100 MHz RF oscillator with ATtiny12
A frequency reference for tuning up the RS-232 to 100 MHz RF desktop channel adapter elsewhere on this site, when I found this Saronix crystal oscillator in my junk box. A few minutes with AVRStudio produced an ATtiny12 to make...
SENSITIVE RF VOLTMETER
This schematic illustrates a peak-reading diode voltmeter that is powered by two amplification stages. A 100 µF capacitor is utilized to create a substantial time constant, which ensures effective damping of the meter. The restricted differential output voltage, combined with...
Regenerative AM Receivers
The regen is basically an oscillator circuit with a gain control that allows the user to adjust the feedback to a point just below oscillation or, quite often, just above the critical level such that a small oscillation is present....
RF wireless allarm magnetic switch PIC16F84
This circuit was formed to create a wireless alarm from a normal magnetic contact. By fixing the magnet to the leaf of a door, or swing of a drawer, it is easy to reveal the opening. To transmit the signal...
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...
Radio harmonic detection circuit
The demodulation and detection circuit is a radio AM intermediate frequency (IF) signal amplifier that performs two-stage detection using diode Dr. It extracts the audio signal from the IF carrier detection and subsequently sends it to the power amplifier stage....
45-860MHz Radio receiver based on UV916-tuner
To build a Spectrum analyzer I needed a tuner. I also needed to learn how to control the tuner. In some old broken TV I found the tuner UV916. It is a common used tuner. The tuner is PLL synthesized...
radio receiver circuit long and medium wave
Oscillating circuits (coils) are constructed on a ferrite bar. For long wave reception, winding "1-2" consists of 135 turns, while winding "3-4" has 20 turns. For medium wave reception, winding "1-2" has 75 turns, and winding "3-4" has 7 turns....
Tuned Rf Wavemeter
L1 and L2 form a tuned transformer with an optimum turns ratio of approximately 1:3. L2 and C1 are used to tune to the desired frequency. The frequency range can extend from 10 kHz to over 200 MHz, depending on...