With the circuit shown in the figure, it is possible to connect or disconnect a load controlled by the relay by touching the sensors X1 and X2.
This circuit was found in an old Poptronics but is still current as transistors can be replaced...
This circuit generates a multiple Inal with 3 outputs and whose frequency depends on the values of the...
We found this circuit in a documentation on active filters from 1977. The gain of this circuit is...