Suggested by General Electric in a 1970 documentation, this circuit makes use of some components of the time, in the case of transistors. The circuit detects smoke by the transparency changing of the air.
Found in an old American publication, this circuit is intended for audio experiments. The...
This battery-powered micropower supply was shown in Radio Electronics magazine in 1991. The...
This power supply for model railroad was found in a February 1961 Radio Electronics Magazine. The...