Modulator Schematic Diagram
No description available.
Modulation monitor
A broad-tuned receiver demodulates the RF signal picked up by a loosely coupled wire placed near the transmitting antenna.
The broad-tuned receiver operates by utilizing a loosely coupled wire antenna, which is strategically positioned in proximity to the transmitting antenna. This...
Adjustable-sensitivity field-strength indicator
The LED illuminates when the RF field exceeds the pre-set field strength level. Germanium diodes are recommended. Additional information: Transistors (NPN) include 2N2222, 2N3393, 2N3904, or equivalent.
The circuit described is a simple RF field strength indicator that utilizes an LED...
BALANCED MODULATOR FOR ADF
Combines signals from loop and sense antennas of an automatic direction finder to produce a 130-cps output with the correct phase for driving the rotor of a resolver to achieve a null position.
The circuit described is integral to the operation...
BALANCED MODULATOR FOR ADF
Combines signals from loop and sense antennas of an automatic direction finder to produce a 130-cps output with the correct phase for driving the rotor of a resolver to achieve a null position.
The circuit described is integral to the operation...
RF-powered sidetone oscillator
A sidetone oscillator is a specific type of audio astable multivibrator. Keying is achieved by turning the oscillator on and off through the application of a positive DC potential, which is generated from the RF signal to the reset terminal...
RF Bug detector
This circuit is not open for discussion. Although working perfectly, it was experimental. I will answer no emails in regards to this circuit. If you are looking for a more serious and reliable bug detector, go to the Countersurveillance Monitor...
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....
Wireless video camera link
This high-performance video camera link transmits signals from a video camera to a VCR or from a VCR to TVs throughout a home. The initial stage of the RF chain features a crystal-controlled oscillator, Q1, operating at a frequency range...
making an rf car
This article is authored by Yash Tambi, a Core Committee Member of roboVITics. It discusses RF-controlled robots, which are among the simplest types of robots. The essential components include a few readily available integrated circuits (ICs), a 433 MHz transmitter...