With this circuit it is possible to visualize the characteristic curve of a component on an oscilloscope. The circuit is from a Popular Electronics from the 90s.
The sensors in this alarm are reed-switches. In the diagram we have only one, but several can be...
We found this circuit in a Poptronics from 1998. The circuit can be extended to more competitors...
The circuit shown in the figure uses two of the four operational amplifiers found on the LM324...