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This project involves a simple and cost-effective transmitter that allows for speech transmission over a short range, functioning effectively as a cordless microphone. The circuit utilizes two integrated circuits from Maxim. The first, IC1, is the MAX4467, which amplifies...
The measured output power and efficiency of a 6 dBm 130nm CMOS class-D inverter chain was analyzed, utilizing gate bias variation to generate a pulse width modulated inverter output voltage (Cijvat et al., 2008). Efficiency versus output power was...
The project described in this article is a commercially available wireless doorbell, priced at approximately $10. It is manufactured in China and is notably inexpensive, making it difficult to replicate using individual components for the same cost. This situation...
The sensor/monitor depicted in the diagram activates the host system upon detecting infrared (IR) signals. It consumes very little supply current, allowing it to remain continuously operational in devices such as notebook computers or PDAs. The ultra-low current drain,...
This is an experimental work to monitor a spectrum pattern of radio band, and is a continuous project from Audio Spectrum Monitor. To analyze the spectrum of an input signal, I chose an Atmel's AVR microcontroller used in Audio...
As shown in the figure, D187 is a UART with its RX/TX signals connected through optocouplers N21, N22, and N29, providing complete optoelectronic isolation for the RS-485 communication interface receiver/transmitter D28 and microprocessor D211. D197 serves as a generator,...
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