EntityQ4477697· pop 5· linked from 12 articlesdirect-coupled amplifierSign in to savetype of amplifierConnectionsInternational Standard Book NumberEntityfrequencyEntityalternating currentEntityNBCEntitydirect currentEntityoperational amplifierEntityBell LabsEntityLee de ForestEntitytriodeEntityRobert NoyceEntityelectronic amplifierEntityvoltage regulatorEntityRCA CorporationCompanydifferential amplifierEntityFairchild SemiconductorCompanytwo-port networkEntityinstrumentation amplifierEntityBob WidlarEntityPhilcoCompanycapacitive couplingEntityCategoriesElectronic amplifiers