This circuit was found in a 1970s General Electric documentation. This circuit already used an emitting LED. The circuit operates at frequencies from 50 Hz to 50 kHz with short pulses
Found in Exar documentation from the 1980s, this circuit has a 60 dB cutoff at 1800 Hz. The...
We found this circuit in the 1982 SGS Linear Integrated Circuits manual. The L78xx is equivalent to 78xx...
This circuit was found in an American technical manual from the 1980s. The LM111 is an uncommon...