Found in a February 1949 Radio Electronics magazine, this dual tube mixer has 4 inputs. Power must come from a 250V source.
This digital electronic game circuit was found in a 1982 publication. It randomly draws the...
EDN magazine in a 90's issue published this TTL technology debouncer flip flop circuit, in this...
This circuit mimics the trill of a bird. We found it in an American documentation from the 90s. It is...