Found in a 1967 Delco documentation, this circuit can deliver power from 40 to 50 W at 8-ohm load. The response ranges from 20 to 20 000 Hz. No information is given about the transformer used.
This is the circuit of an old oscilloscope, using components from the 80s. Of course, it serves...
This circuit is from a documentation on the MC1539 from Motorola and may, however, be implemented...
Up to some minutes intervals can be obtained from this circuit. The circuit can use a lamp (or...