We found this circuit in a 1998 publication. The circuit has controls for both frequency and signal strength. A lamp is used to monitor the signals. The supply is made with a voltage of 12 V.
This electronic level or plumb indicator has two mercury switches as sensors. The indication is...
The circuit shown causes two LEDs to alternately flash at a frequency given by the capacitor. The...
This new Texas Instruments component consists of an inductive proximity detector that can be used...