This simple tester was found in a Popular Electronics from the 90s. The circuit is powered by two 9 V batteries since it requires a symmetrical source.
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...