This is the factory setting (National Semiconductor) of the TDA2006 as an audio amplifier. The circuit works with 24 V and the diodes can be 1N4148.
This circuit is from Motorola documentation from the 70s. The transistors used are high voltage types...
This detector with ultra-low deviation was found in an American documentation from the 90s....
This model circuit was found in Radio Electronics magazine from February 1960. The power...