s3-1 The OP-AMP The operational amplifier hereafter OP-AMP) is developed in the 1940s primarily for use in analog computers, made cheaply and readily available in the late 1960s through integrated-circuit technology. The actual construction of a modern oP-AMP is indeed very complex, involving many transistors, diodes, resistors and capacitors.The operational amplifier (hereafter OP-AMP) is developed in the 1940s primarily for use in analog computers, made cheaply and readily available in the late 1960s through integrated-circuit technology. §3-1 The OP-AMP The actual construction of a modern OP-AMP is indeed very complex, involving many transistors, diodes, resistors and capacitors