This battery circuit provides a charging current of 500 mA depending on the solar panel. The switching circuit is from a National Semiconductor documentation from the 90s.
This high impedance circuit uses a 12 V lamp to test voltages in a car. We found it in a Popular...
We found this circuit in a 1994 publication. It uses common components and can measure frequencies from 0...
This receiver can tune in the 3 to 12 MHz band with good sensitivity and selectivity, using a good...