47dB Microphone Preamplifier Kit

A simple but reliable portable RDA5807M-based radio capable of receiving FM radio in the 87-107MHz range. The radio can be tuned via the 2 rightmost buttons (in 100khz increments) and the volume using the buttons on the left. It can be powered by 2 x AA batteries, or via the micro-USB socket provided. This device also has a headphone output (3.5mm jack).

Click here for manual

An Instructables article detailing the assembly process can be found by clicking here

Technical Specifications:

Input Voltage: 3-5VDC
Output impedance: 8Ω
Output power: 0.5W
Receiver frequency: 87MHz-108Mhz
Dimensions (fully assembled): 107 x 70 x 23mm