Found in English documentation from the 1990s, this circuit can employ equivalent components. The capacitor must be low leak type. The circuit can operate as a shield.
Found in a 90s American documentation, this circuit mimics the Enterprise warning signal from the...
This circuit was suggested by Linear Technology in a 1980s documentation. The setting applies to...
This circuit was found in a 1980s documentation. Q1 and Q2 can be BC548 and SCR a TIC106. The...