Found in Popular Electronics from the 1980s, this circuit uses two operational amplifiers from that time. The circuit has frequency and symmetry adjustment.
This shield circuit uses a common CMOS port. The voltage depends on the interfaced logic. The...
This logarithmic gain operating configuration was found in the June 1994 Electronics Now magazine. The...
This circuit was found in the Spanish magazine No longer in existence, Mundo Electrónico, in a...