This circuit was found in a 1967 US documentation. The circuit applies to modern general purpose transistors. The circuit has no offset. The power supply must be symmetrical.
This 1970 Philips circuit uses a mechanical counter. The circuit is triggered by a reed switch...
Found in old documentation about neon lamps, this circuit shows how to add a simple blown fuse...
This fuzz uses only one transistor that can be the BC548. Signal input and output cables must be...