This high quality circuit with complementary symmetry was found in an Electronics World of 1966. It can be made with modern transistors like the BD or TIP series.
Using the LM3909 this circuit was found in the January 1992 issue of Radio Electronics magazine....
This circuit consists of a bass filter that can be used as a subwoofer in a sound system. The...
This circuit uses a photocell as sensor and a sensitive relay according the power supply voltage....