Found in a 1990s American documentation, this circuit provides an output voltage approximately 4 times that of the input voltage. Diodes are general-purpose types.
Found in a 1967 documentation this circuit can be applied to any operational amplifier. Components...
This simple circuit was found in the Spanish magazine “Todo Electronica”, in an edition of 1996....
Found in a Popular Electronics from 1992, this circuit uses a PLL567 in an audio meter bridge that...