Circuit Lake

This data logger project based on firmware-only USB implementation. There are two part in this project, transmitter and receiver. The transmitter consist of ATTiny45 microcontroller, a SHT11 sensor (digital temperature and humidity sensor) and a hoperf RFM12 868 MHz transceiver module. The transmitter powered by 2 AA cells. While the receiver uses ATMega8 µC and [...]

If you want to boost the output power of your low power FM broadcast band exciters then you can try this project, 40W broadband VHF RF Power Amplifier. The amplifier design is based on the recently introduced (1998) Motorola MRF171A MOSFET. The initial feasibility was performed using a linear RF and microwave simulation package, specifically [...]

If you need need small and frequency stable FM transmitter for your application then you can try XFM1 transmitter. The XFM1 transmitter is 147.460 MHz crystal controlled tone modulated FM transmitter. The transmitter is tone modulated by a microcontroller PIC 12F675 approximately every two seconds. A Morse code call sign ID is transmitted approximately every [...]

Laser Audio Transmitter is final project from instruct1.cit.cornell.edu student. In This project Jehhal Liu and Daniel Zuo try to build a device that able to transmits an audio signal using a laser beam.
They created a mono-axial transmitter/receiver setup that converts an analog audio signal, via a standard 3.5mm jack, and transmits it via a [...]