This simple circuit to monitor the frequency of the power grid uses an analog indicator. The adjustment trimpot can be 4k7 and the indicator is 100 mA full scale.
This circuit converts a resistance in the range between 1 k ohm and 1 MΩ to a signal in a...
We found this circuit in an old American documentation. The circuit is simple by making use of an...
We found this circuit for 330 MHz using PIC in the magazine Electronics Now of December 1994. The...