This small 1W turntable amplifier was found in the 1975 RCA tube manual. It is a commercial circuit at the time.
This amplifier is from the 80s integrated circuit manual itself. Equivalent configurations can be adopted for...
Other operational amplifiers series, such as the MC34072, MC34074, MC35071, MC35072, MC35074 d...
This circuit was published in a 90s Radio Electronics. The circuit uses the well-known LM386 that...