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.
This circuit was found in a recent English publication, making use of a power transistor that...
We find this oscillator in a 1980s documentation. The frequency depends on the crystal and the...
With this circuit it is possible to receive and send audio signals simultaneously over the same...