This circuit was found in Ferranti's 1974 transistor manual. The transistors are from the period and the frequencies generated are between 50 Hz and 2 kHz.
This circuit is from a Radio Electronics from May 1994. In it we have the way to connect three 4017...
This site is the primary source of information about Technology, Electronics, Telecom, Robotics,...
This circuit is from a Radio Electronics from December 1958. It makes use of a photocell of the...