Criseo progetti-Electronic - Vacuum tubes, Capacitors, Amplifiers

Tubes amplifier
Audio Power Hi-Fi
Preamplifier
mono Circuit
Stereo Circuit


Domotic System

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Detail of ‘second-point’ used for the main ‘crown’ screen of the digital stopwatch

The ‘00, 15, 30, 45’ marks have different shape and color (high brightness blue)

The different color allows the swimmers to easily find the start times during the repetition training series

The slightly dark acrylic panel was drilled and the ‘seconds-point’ led were mounted

RF stage during one of the final test

The wireless connection exploit a 433MHz modulated OOK radio transmitter

In the picture are shown the 868MHz model and its main project scheme

the radiocontroller of the stopwatch is mounted in the ‘OVO’ enclose

to help the user a led is lightening on when the transmission is on going

Thanks to the sleep-mode applied to the controller, that switch automatically off the device after each use, the 3V battery installed reached over 3 years life

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News & Info: Stopwatch for swimming pool >> click here