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.
This alarm circuit was found in April 1975 Radio Electronics magazine. The circuit uses a 12 V...
This circuit was found in the July 1991 issue of Radio Electronics magazine. It converts a binary...
This transistor radio was manufactured in the 60s and has 6 transistors from that time. The...