With this circuit it is possible to add a conductance scale to a common multimeter. The circuit was found in the magazine Electronics Now of February 1997.
The basis of this project is an integrated 566 (not to be confused with a 556 which is a double...
This circuit was obtained in a 1998 publication, but it can be easily assembled. The circuit...
This game was found in an old Popular Electronics. The unijunction transistor can be 2N2646. The...