Abstract: Centrifugal feeder device having an outer enclosure (2) which accommodates a ring (3) mounted rotatably in the enclosure (2) and lying in an approximately horizontal plane, and a disc (4) rotatable in the ring (3). The axis (5) of rotation of the disc (4) is inclined with respect to the axis (6) of rotation of the ring (3), the disc (4) and the ring (3) approximately tangent to each other in a transfer area (10) and distant from each other in a loading area (8). The ring (3) is surrounded by a lateral guide (15). The ring (3) supplies an outlet channel (13) whose inlet is situated above a part of useful width of the ring, the ring (3) is provided with approximately radial notches (3a), and the device includes a mechanism for adjusting the useable width of the ring (3).

Abstract: Method of orienting preforms, wherein in a first step the preforms (5) are processed to form at least one flow of preforms aligned in a substantially horizontal flow channel, the preforms exiting said channel being tipped in a second step so as to form at least one flow in which the preforms (5) are substantially vertical. Device for the implementation of said method.

Abstract: Centrifugal feeder device comprising an outer enclosure (2) which accommodates both a ring (3) mounted rotatably in the enclosure (2) and lying in an approximately horizontal plane, and a disc (4) mounted rotatably in said ring (3), the axis (5) of rotation of the disc (4) being inclined with respect to the axis (6) of rotation of the ring (3), the disc (4) and the ring (3) being U approximately tangent to each other in a transfer area (10) and being distant from each other in a loading area (8) which is at a lower level than the level of the transfer area (10), the ring (3) being surrounded by a lateral guide (15) which determines, with the inner edge of the ring (3), a useful width of the ring (3), said device being characterized in that the ring (3) supplies an outlet channel (13) whose inlet is situated above a part of useful width of the ring, in that the ring (3) is provided with approximately radial notches (3a), and in that the device comprises means for adjusting the useable width of the ring (3).

Abstract: The invention relates to an amplifier for audio signals comprising a first (A.sub.1) and a second (A.sub.2) stage having a global feedback loop (B) between the output of the second stage and the input of the first stage, the second stage having a local feedback loop (B.sub.2) between its output and its input. Each feedback loop has a comparator element (C.sub.1). The amplifier comprises a means preventing the offset voltage present at the output of the first stage (A.sub.1) from being reinjected as input by feedback (in particular via the amplifier output). The local feedback loop (B.sub.2) is such that the second stage (A.sub.2) receives feedback at least continuously. The low frequency interference signals produced in the second stage (A.sub.2) are reduced by the feedback of the second stage (A.sub.2).

Abstract: The invention relates to an amplifier stage comprising at least one module presenting a first transistor (T.sub.1) whose base forms an input terminal and a means to maintain a substantially constant current in the collector-emitter path of the first transistor (T.sub.1). Said means is comprised of a first current source (A.sub.1) connected to the collector of the transmitter (T.sub.1). A feed-back circuit has a direct voltage source (V.sub.3) arranged to maintain substantially constant the potential of the collector of the transistor (T.sub.1). It presents a path for the main current between a terminal (S'.sub.1) of the stage and the emitter of the transistor (T.sub.1). The value of said main current is a function of the voltage (V.sub.3) and of the potential (VCT.sub.2) of the collector of the transistor (T.sub.1); this potential remains substantially constant.