Found in a 1990s Popular Electronics, this circuit uses a small transformer matched to the impedance of the speaker being driven.
August 2017 - STMicroelectronics' new T850 switches with triacs up to 8 A can be obtained from...
This circuit is from the 1990 Motorola Linear Databook. The circuit can be applied to other...
Found in documentation from the 90s, this circuit makes use of components from the time....