São circuitos integrados de amplificador operacional comerciais:
LM324, LM747, UA741CD e CA3140.
LM324, HM6264LM, AT24C08B-PU e CNY70.
LM324, LM35, BH1750FVI e 74HC374N.
SW-18010P, LM455, LS7420 e CNY70.
A1301, LM234, 74HC74 e CD4013.