This circuit can flash for up to 30 months using alkaline batteries as shown in the table next to the diagram. The circuit is from a Radio Electronics from January 1992.
Circuits of the same type can be found in this section from various publications. This one is from...
This circuit can measure capacitances in various ranges using a common analog indicator. The...
Two potentiometers mounted at right angles, so that they can be operated by a lever, form a very...