Solar power source (CB20481E)

In the figure we have a solar power source for experiments with this type of energy. The cells must be of the same type.

Voltage to Period Converter (CB4817E)
This 90's Electronic Design circuit converts the period of a signal into a frequency. The...
Power on reset (CB7176E)
These reset circuits when the power is turned on were found in an 80's EDN. The circuit also...
FM receiver with BC548 transistor at output (CB23552E)
The receiver shown above was sent in by contributing reader Adriano Muniz Moura and is used for...