Suggested by General Electric in a 1968 documentation this integrated amplifier uses a component of the era, the PA237. The circuit runs on 24 V and excites a 16-ohm speaker.
September 2016 - It can be obtained from Mouser Electronics the new ADC AD7779 from Analog Devices with...
This circuit, which appears in other applications on this site, was taken from a 2000...
Launched in 2016 but with documentation reviewed in June 2017, the Texas Instruments TLV854x...