The CA3020 integrated circuit was one of the first commercial types, sold in the 1960s. The circuit presented is from 1968 using a power stage with RCA transistors of the time.
The Texas Instruments TPA3100D2 integrated circuit (www.ti.com) consists of an efficient class D...
This circuit was found in an American documentation on transistors from the 60's. The transistor is made...
Found in a Radio Electronics from the 90s, this circuit generates a 1 kHz signal to serve as a...