Found in American documentation from the 90's, this circuit is very current and can be implemented with transistors of general use. Never use a power supply without a transformer.
Originally, this circuit is from an English magazine, but I found it in Argentina's Radio Chassis...
This electronic level or plumb indicator has two mercury switches as sensors. The indication is...
This circuit is from the 70's documentation. We kept the original text of the time. The so-called...