This circuit is from Motorola's Linear Interface ICs from 1993. The MC1723 is the equivalent of the well-known 723. The transistor supports equivalents.
T Found in a 1992 Popular Electronics, this sophisticated circuit uses two speakers on a different...
We found this circuit in a 1995 documentation. It is a two-channel preamplifier for supplying a...
This timer was found in a 1980 publication. With the BC548 for Q1, an 8-ohm speaker with 6 V power...