This timer for a dark room for developing photos came out in a Radio Craft in April 1947. The circuit is powered by the power grid and has a neon lamp for timing.
Timer (T1142E)
- Details
- Written by: Newton C. Braga
This timer for a dark room for developing photos came out in a Radio Craft in April 1947. The circuit is powered by the power grid and has a neon lamp for timing.
