Abstract: The emptying device for a bulk silo (1) with flat or slightly inclined silo bottom (8) comprises an outer slope (2) and open air transport grooves (7) distributed over the silo bottom (8). The air driven conveying chutes (7) extend radially to a ventilated annular chamber (3) located inside the outer slope (2) of the silo bottom (8), the bottom of which annular chamber is provided with open air driven conveying chutes (4) and is inclined toward the discharge opening (5). The bottom of the annular chamber (3) is located lower than the silo bottom (8).

Abstract: A current-mirror arrangement comprising a first and a second transistor (3, 4). The base and the collector of the first PNP transistor (3) and the base of the second PNP transistor are all coupled to a junction point (1) to receive an input current (Ye). The output current (Ya) is available at the collector of the second PNP transistor (4). The arrangement comprises a compensation circuit (2) which supplies a compensation current to the junction point (1) which is substantially equal to the sum of the base currents of the first and second transistors.

Abstract: The invention relates to a circuit arrangement for controlling an oscillator. In a first phase-comparator circuit a burst signal whose phase alternates in a predetermined sequence is compared with a first oscillator signal. The output signal generated by the first phase comparator circuit is superimposed on a correction signal generated in a correction circuit, so as to eliminate fluctuations as a result of the phase alternation of the burst signal. The correction circuit is disabled when the magnitude of the phase difference exceeds a specific limit value.

Abstract: A circuit arrangement for deriving a control signal from a synchronizing signal whose phase alternates in a predetermined sequence, which control signal is independent of the phase alternation, comprises a reference oscillator (1) which supplies a reference signal, a phase comparator (5) for deriving a phase signal from a synchronizing signal and a reference signal, a correction circuit (22, 26) for generating a correction signal, and a logic combination device (10) for superimposing the phase signal and the correction signal on the control signal. In accordance with the invention control signal variations as a result of the phase alternations in the synchronizing signal are eliminated in that the correction circuit (22, 26) generates a polarity signal which dictates the polarity of the correction signal by comparing the phase of the reference signal and the phase of the synchronizing signal.

Abstract: The invention relates to a modulator comprising a first differential amplifier (6) which receives an input signal and a correction signal for adjusting the quiescent currents on the first and second output. The first differential amplifier (6) is coupled to a second differential amplifier (19) and a third differential amplifier (22), which receive the carrier signal and which supply the modulated signal. A difference signal proportional to the difference between the current of the first output and the current of the second output of the first differential amplifier (40) is applied to a low-pass filter (25), whose output signal is applied to a control amplifier (40). The control amplifier (40) supplies the correction signal to the second input of the first differential amplifier (6) via a storage device (50).