This circuit was found in a PC documentation from 1996. It can be used as a shield with modern microcontrollers.
We found this circuit in Radio Electronics from the 90s. The components are current. The sensor is a...
This circuit for measuring very low currents was found in an American documentation from the...
Found in Elektor Electronics from the 90s, this circuit produces the tone of 1 750 Hz for calling VHF...