Found in Popular Electronics from the 1980s, this circuit uses two operational amplifiers from that time. The circuit has frequency and symmetry adjustment.
Disabling this circuit from a 2002 documentation can only be done by pressing 4 keys in a correct...
This circuit was obtained from a manual of the integrated circuit itself, but can be applied to...
This simple 2004 circuit uses a common sensor used in television and other equipment. It checks...