This watch uses a liquid crystal display. The circuit is from the 80s and the module used is uncommon nowadays. Power is provided by a single cell.
Obtained in a Popular Electronics from the 90s, this circuit converts sinusoidal signals up to a...
The transistors of this circuit found in an old documentation from the 70s can be the BC558. What...
Found in a 1969 Electronics World, this circuit generates low frequency signals with two...