Abstract: An apparatus for assembling components on printed circuit boards has a central region having two linear guides proceeding parallel in close proximity to one another, and carriages being displaceable on these guides. Each of the carriages has a transverse beam projecting outwardly therefrom, on which a processing head is movable, and the beams of the carriages on one side of the longitudinal guides extend in an opposite direction to the beams of the other side. The two separate processing locations are provided independently served by one or the other of the carriages. Thus, a high processing capacity is obtained.

Abstract: The transport wheel of the feed device is driven by a drive motor in such a manner that one revolution of the drive motor produces a transport movement of the tape which corresponds to a fraction of the pitch of the component compartments in the tape. Before the drive motor has completed a predetermined number of revolutions, a stop is applied, which stops the motor exactly when the next complete revolution has been completed.

Abstract: A circuit arrangement for limiting the current at make for a transformer wherein, in order to avoid the current peak at make when switching a transformer on, resistors are connected between operating voltage and the primary winding of the transformer. A test winding at the secondary side of the transformer is connected via a rectifier to the supply input of a contactor, so that the switches of the contactor close after the transformer is turned on and the resistors therefore no longer lie between operating voltage of the primary winding. PTC-resistors connected in series with the resistors assure that the resistors are not overloaded by the high-operating current of the transformer if the switches do not switch.

Abstract: A circuit arrangement for limiting the current at make which includes hot-carrier thermistors that see to a reduction of the current flow at make. Only when a further hot-carrier thermistor has been adequately heated by the flow of current are the hot-carrier thermistors bridged, and the capacitative load receives the full operating voltage. After turn-off, an ambient temperature-compensated voltage divider at the base of a transistor prevents the immediate re-activation until the further hot-carrier thermistor and, thus, all hot-carrier thermistors, have adequately cooled.