We found this circuit in Radio Electronics from the 90s. The components are current. The sensor is a common general-purpose transistor. The connection to the sensor is made by twisted pair.
This circuit produces a loud sound in the speaker when water level reaches the sensor. The power...
May 2016 - It can be obtained from Mouser Electronics new display 1092 from VDC. The new LED...
This Motorola circuit is from 1965. Collector currents must be 7 and 12 A for transistors....