Topic: Design solar panel with bateries for pc fan at radiation shield part 2.

[weather1967]

Ηi again
I make a electronic circuit with 2N2222 tranzistor, and CA3140E microcircuit, i drive to relay with better accurace,with trimmer i tuning at how voltage i want to drive the relay.
I have some photos
All it is the same with other project ,except the relay circuit
Fan turn the day with full speed ,and the night at half speed