This circuit found in an American documentation from 1964, alters the duration of a pulse and can operate at frequencies up to 10 MHz. The transistors are from that time.
This circuit was found in Linear Technology documentation from the 90's. The circuit uses...
This different audio amplifier was found in a 90's Electronic Design. The circuit uses components...
This circuit of a 1991 PE Hobbyst Handbook allows the brightness of the incandescent lamp to be...