This circuit is from a Radio Electronics from December 1964. The components are from the time and modern equivalents for transistors and diodes can be used.
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...