Found in a 1969 EEE, this circuit is based on an operational amplifier of the time and on old type MOSFETs. The components support modern equivalents.
SGS's L78xx is equivalent to the regular 78xx. The circuit was found in the SGS manual of linear...
This circuit was obtained in an English publication of 1993. It is an amplifier for...
Found in a Hands-On Electronics from the 90s, this circuit produces the dial tones of an old...