gps jammer
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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...
RF based Automatic meter reading
RF based Automatic meter reading, or AMR, is the technology of automatically collecting data from energy meter and transferring that data to a central database for billing and/or analyzing. This means that billing can be based on actual consumption rather...
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...
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...
GPS-Disciplined 10 MHz Frequency Standard / GPS-Based Universal Time Clock
The block diagram illustrates that a 10 MHz signal is generated by an oven-stabilized 10 MHz crystal oscillator, which is locked to a precision 10 kHz signal produced by a GPS receiver module through a phase-locked-loop (PLL) circuit. In addition...
MRFICl505R2 based GPS receiver RF front-end circuit
MRFICl505R2 is a 1.575GHz GPS downconverter chip. It integrates a mixer, VCO, PLL, crystal oscillator, A/D converter, loop filter, and other circuits. The MRFICl505R2 IF output frequency is 4.1MHz, with a typical conversion gain of 105dB, an operating voltage of...
A Low Power Wireless Audio Power Amplifier circuit
This low-cost project enables audio reproduction from a television without disturbing others. It eliminates the need for wired connections between the TV and loudspeakers. Instead, it utilizes invisible infrared light to transmit audio signals from the TV to the loudspeakers....
Schematic of The Infrared Rays Wireless Headphone
The transmitter circuit for inductive headphones must be installed on a wall or ceiling, limiting their use outdoors. This is a significant drawback of inductive headphones. In contrast, infrared wireless headphones do not have this limitation; their flexible infrared transmitter...
building rf remote control
The simplest approach to creating a remote-controlled robot is to repurpose a low-cost wireless toy car by removing its receiver module and remote control. Alternatively, one can design a custom RF remote using an ASK (Amplitude Shift Keying) based transmitter/receiver...