We found this circuit in the 1982 SGS linear integrated circuit manual. The L149 is not common today and the circuit can be implemented with equivalents.
The circuit shown has the advantage over the reductions with resistors to have a much higher...
Originally this circuit is from an English magazine, but I found it in Argentina's Radio Chassis...
This circuit, from an old publication from the 70s, uses neon lamps as indicators and can work on...