Fluidic devices wherein the fluid stream or streams acting therein are always in the laminar state. The important elements of each fluidic device, which include one or more supply passageways, one or more receiver passageways, vents, a cavity and possibly one or more control passageways, are of a configuration and location such that fluid flowing through each supply passageway forms a laminar fluid stream which is capable of being received by one or more of the receiver passageways in a laminar state. The Reynolds number of the fluid forming the laminar fluid stream is preferably within the range of 200-1,500. The subject invention is applicable to a wide variety of fluidic devices including proportional and digital amplifiers, OR and AND gates, and rate sensors wherein the signal-to-noise ratio is substantially lower than that of conventional turbulent flow fluidic devices.