Found in old documentation, this circuit has only the most difficult component to obtain the PUT. The sensors are electrodes placed in the reservoir. The circuit directly controls an AC power load.
In this application we show how to get tuning from 0 V to an LM350 regulator IC. The setting also...
This circuit uses the 741 Operational Amplifier to drive two LEDs. The LEDs indicate the signal of...
This is the receiver from the previous alarm system. The circuit is from Radio Electronics, April...