This biestable vox circuit was found in an old documentation. The circuit makes use of components of the time (80's) and can work as a shield since the power is 5 V.
This multi-function filter can be used as a shield controlled by TTL signals. At the high level it...
This 100 kHz crystal oscillator uses 7404 to generate square signals. We found it in a Popular...
This circuit supplies 5 V from two AA batteries. The output current is 4 mA, resulting in an 11 mA...