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.
Circuits similar to this appear elsewhere in this section. The transistors can be BC549 (low...
This circuit indicates when a rain is acidic by monitoring its pH. The circuit is from a 90s RE...
In a microprocessor project (shield) for control applications, a triggered clock can be useful....