A power supply (1) for a load in the form of a PCMCIA card (2) has and onboard GPRS class (10) module (not shown). The module, and therefore card (2), demands a load current i.sub.load that has an average value over time and periodic instantaneous peak values (i.sub.peak) that are significantly higher than the average value. Power supply (1) includes a pair of input terminals (3) for connecting with a power source in the form of a regulated power supply (4) that is contained within a personal co...

A switching mode power supply uses two power source inputs, an alternating current input and a direct current input. A pulse width modulation controller is used to control current from two primary windings of a transformer. The secondary of the transformer has a rectified direct current output. From the direct current output a current/voltage comparator receives a signal across a sensing resistor and through an inverter and in parallel with respect to the direct current output. The current/volta...

To permit ready reversal of rotation of a yarn supply drum, and to positively guide yarn being drawn off the drum, a thread guide element in form of a finger is located laterally offset with respect to the axis of rotation of the storage drum, extending essentially in a direction transverse to a tangential plane at the pull-off point of the yarn, the lateral offset being changeable to either side of the pull-off point to accomodate different directions of rotation of the drum, with simple change...

A switching power supply which detects a power failure within a short period and maintains the DC output voltage (V.sub.O) for a long time. The switching power supply comprises a first voltage control means which controls a switching means (2) by means of a pulse width modulation means (9) which responds to a first voltage comparator means (8) which compares the DC output voltage (V.sub.O) and a reference voltage (V.sub.R); a second voltage control means having a pulse width modulation means wor...

A first MFC 10 and a second MFC 10A are disposed respectively on a silane gas feed line 5 and an inert gas or other dilution gas feed line 19 for feeding a gas for semiconductors such as silane gas or an inert gas or other dilution gas to a mixing chamber 13. A buffer tank 21 is provided which restrains or relieves the pressure energy of the mixed gas coming from the mixing chamber 13 and supplies the same mixed gas to each of a plurality of semiconductor manufacturing units 4 separately. The fi...

A novel supply discriminator circuit is disclosed for detecting the level of a supply voltage during power-up of a system for configuring an integrated analog circuit such as a PCMCIA card. The circuit compares a reference voltage with a divided down supply voltage and latches the result a predetermined delay later. The delay thus provides timing for the supply voltage to stabilize after power-up to assure accurate detection, as well as noise immunity from other devices.

An electrical supply line for the supply of current to railway vehicles comprises at least one wire conductor forming a current supply line for a current pick-up device. A rigid body, which may be electrically conducting or otherwise and which is covered with an insulating covering, is constituted by rails and supports the wire conductor. The rails are located in an end-to-end relationship support the wire conductor at spaced intervals by means of attachment members.

A supply unit, consisting of a plurality of adjacent arranged modular-like carriers each of which is associated with a dental handpiece, each of which has associated therewith a supply element for the individual supply of the associated handpiece, wherein the supply elements as well as the carriers are arranged adjacent each other and are provided with through conduits extending through collective supply elements and which carry the supply media for the handpieces. The conduits are connected, th...

A circuit is disclosed in which a current responsive bistable regulator automatically interrupts the charging of a battery when the latter reaches a predetermined voltage. The dynamo source, however, continues to supply the miscellaneous loads of the vehicle. When the dynamo is cut off the loads are fed by the battery through a thyristor which is shut off when the dynamo is reenergized.

When burning black liquor obtained during cellulose pulp manufacture it is desirable to maintain a constant atomizing pressure. Mere throttling of the liquor supply in order to adjust the combustion to actual heat demand will alter the spray pattern. A pressurized gaseous fluid is injected into the liquor supply conduit, and the amount of this gaseous fluid is governed in response to the actual heat demand. A monitoring device senses the pressure in the supply conduit downstream of the throttle ...