RX/TX Switching Circuit
#RF
#transmitter
#receiver
#switching circuit
#signal control
#radio frequency
#wireless
#telecommunication
#electronics
#circuit design
No description available.
Remote-Controlled Telephone/Fax Machine Switch
This system uses a transmitter operating at approximately 100 kHz to control a remote receiver. A line splitter can connect the transmitter to the active telephone line. The transmitter is a CMOS oscillator equipped with output buffer stages to drive...
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...
Simple Low-Frequency Receiver
Using an NE602 heterodyne detector and U1 as an RF amplifier, this receiver tunes the middle portion of the low-frequency spectrum from 150 to 250 kHz. U2 is a loudspeaker amplifier.
The described circuit employs an NE602 integrated circuit as...
RF Induction Meter
This instrument measures inductances from 0.1 microhenry to 3 millihenries, divided into four ranges set by a switch. It operates from 12 volts and is powered by eight AA type cells attached to the unit. Initially, Drew Diamond's unit in...
Wireless IR Headphones circuit
This wireless infrared (IR) headphones circuit project enables the transmission of audio signals through an infrared connection. The circuit consists of two main components: a transmitter and a receiver. Unlike radio frequency (RF) transmitters, both parts of this application must...
Wireless-fm-microphone
Transistor Q1 functions as an amplifier for the condenser microphone MIC1. The output from Q1 is fed to the base of transistor Q2 through a 4.7 µF capacitor. Capacitors C2 and L1 form an LC tank circuit, which is utilized...
Low Power Wireless Audio Power Amplifier as baby mointor
This appears to be an infrared (IR) transmitter. IR signals do not penetrate walls, and it is assumed that this device is intended for use in a room separate from the one in which the user is located, rendering it...
6m wireless remote control switch circuit
This example describes a wireless remote control switch featuring reliable operation and practical characteristics, capable of remotely controlling a 6-channel device within a 6-meter range for household electricity. The wireless remote control switch circuit consists of a wireless transmitter and...
Beacon-transmitter
This transmitter is suitable for transmitter hunts, remote key finding, or radio telemetry in model rockets. It can be tuned to the two-meter band or other VHF bands by adjusting capacitor C1 and inductor L1. L1 consists of four turns...