This circuit supplies 5 V from two AA batteries. The output current is 4 mA, resulting in an 11 mA input current from the batteries. The circuit is from an old EDN.
The BFO or Beat Frequency Oscillator is used to receive telegraphic signals or even modulated in...
Taking advantage of the comparator setting, we can use the Norton amplifier as an over temperature...
This circuit was found in an American documentation from 1975. The components of the time can no...