RF-Workbench
#RF
#wireless
#communication
#signal processing
#transmitter
#receiver
#antenna
#frequency modulation
#RFID
#telecommunication
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A Low Power Wireless Audio Power Amplifier
A battery-powered portable unit suitable for all types of televisions. This low-cost project allows audio reproduction from a TV without disturbing others.
This battery-powered portable audio unit is designed to provide a convenient solution for reproducing television audio discreetly. The unit...
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...
A8V W8EXI 6CL6 One Tube Transmitter
A8V W8EXI 6CL6 One Tube Transmitter. The operation of the 6CL6 transmitter is actually quite sophisticated.
The A8V W8EXI 6CL6 One Tube Transmitter is a compact and efficient radio frequency (RF) transmitter that utilizes a single 6CL6 vacuum tube for its...
Simple RF Power Meter
Many beginners trying out their skill with QRP TX for the first time have to overcome many problems before they are able to come on the air. One usual complaint is that everything is working fine, but the signal is...
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...
RF oscillator uses current-feedback op amp
A current-feedback amplifier is a well-known component with many uses. Its basic block diagram shows that its input stage is a voltage follower in practice, a symmetrical emitter follower. The configuration samples the output current, converts it to voltage across...
472 kHz Transmitter
The exciter board is based on an Arduino WSPR exciter. Plans are underway to create a more advanced stand-alone board using inexpensive Chinese DDS modules available from eBay. Currently, a DDS60 by AmQRP is being utilized. The output from this...
Keyless Lock
RFID technology is rapidly entering the automotive market with the application of passive keyless entry systems, which are expected to replace traditional remote controls used for opening or closing vehicle doors.
RFID (Radio Frequency Identification) technology employs electromagnetic fields to automatically...
REGENERATIVE_SHORTWAVE_RECEIVER
The receiver consists of multiple subassemblies, including an active antenna, an amplifier featuring regeneration control and band-switching circuitry, an AM detector, a power amplifier, and an output device such as an internal speaker, external speaker, or headphones. Additionally, it is...