This circuit makes use of components from the time it was published. The TCA151 is not a common component today. The circuit generates 10 to 10 kHz signals.
This sensitive receiver with earphone was found in an English documentation from 1963. The...
Found in a 1980s American documentation, this circuit inhibits ignition. The circuit is valid for...
This crystal-controlled circuit was obtained from a 1980s documentation. The power supply should be 5...