Squelch circuit
#RF
#squelch
#noise reduction
#signal processing
#communication
#audio suppression
#receiver
#transmitter
#radio
#circuit design
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Building an RF Remote Control System For Robotics Control
With a handful of inexpensive components, a little creativity, and the power of PicBasic, you can build some pretty outstanding robotics creations as Rob Arnold proves with his Ruf-Bot project. RF remote control is just way too cool not to...
2 channel RF remote control
The basic small-range remote controls are Infrared and RF (Radio Frequency). One of the weaknesses of Infrared is that the signal cannot pass through walls. Therefore, to control a garage door, an RF remote control is necessary. The circuit (transmitter...
Simple Rf Test Oscillator Circuit
A simple oscillator for intermediate frequency (IF) alignment at 455 kHz can be useful in field testing or in scenarios where a standard signal generator is available. The inductor (L1) should resonate at the desired output frequency with the series...
TRF1115 RF Down-Converter
The TRF1400 VHF/UHF RZ ASK remote control receiver is specifically designed for RZ ASK (return-to-zero amplitude-shift keyed) communications systems operating in the 200-MHz to 450-MHz band. This device is targeted for use in automotive and home security systems, garage door...
Icom IC-751 RAM reprogramming
Everything appeared to be functioning normally. The half-duplex operation and pedal control in telegraphic mode allowed the operator to transmit while listening during pauses, seamlessly switching to the standard mode by simply pressing the pedal at the right moment. Previously,...
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...
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...
RF 433MHz - 3 channels remote control
The schematic is very simple and includes, in addition to Nutchip, with its three driving transistor and LED, the radio receiver. The data come from the OUT pin of the receiver and enter the pin REMOTE remote control. The RESET...
Transmit Time Limiter
This circuit prevents transmissions that are too long, which can cause timeouts in repeaters and/or occupy a communication channel for an excessive duration. During transmission, the PTT (push-to-talk) line from the microphone is grounded, resulting in one input of the...