This humidity sensor indicates the different levels of conduction of the sensors through an LED bar. The circuit is from Popular Electronics and must be powered by cells or battery.
This filter is current driven and has the formulas given by the two diagram options. The circuit...
This circuit was found in an old publicatio n from the year 1958. The circuit controls an external load by...
This complementary-output amplifier can be used to source a good qualuty signal to high impedance...