This circuit also appears elsewhere on this site, obtained from other sources. This is an 80's American schematic book. Instead the lamp can be used white high-brightness LEDs.
We can implement this filter with more modern equivalent operational amplifiers, since the LM110 is...
This is the transmitter for the previous circuit. We found it in a 90s Electronics Now. The...
We have already presented this circuit, obtained from manuals from other manufacturers of the used...