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.
The power source shown for powering for small TTL circuits was found on a Radio Electronics...
The author of this project from a 1982 publication took advantage of other projects that we...
Originally indicated as an alarm alert in a 1990s US publication, this circuit can be used as a...