Abstract: A tuning circuit for tuning a high frequency receiving apparatus with residual sideband modulation, especially a television receiver, with a counter for forming encoded values of tuning voltage, with a store for the digital storing of the encoded values of tuning voltage, with a D/A converter for generating the analog tuning voltages from the encoded values and with a circuit for automatic fine tuning to the required position of a received transmitter. In such tuning circuit means are provided which so alter the value of the tuning voltage before or during writing into the store or after or during reading out from the store that this value corresponds not to the required tuning position but to a tuning position shifted into the fully transmitted sideband. The exact tuning ot the transmitter to the required position is effected by the circuit for fine tuning.

Abstract: A circuit arrangement for a quartz controlled electrical clock comprising an oscillator stage a frequency divider separated from the oscillator stage by a gate controlled by a control logic unit, an output stage connected to the frequency divider and a stepping motor connected to the output stage, the control logic unit responding to a command signal to open the gate and disconnect the oscillator stage from the frequency divider with the frequency divider retaining its memory content at the instant of disconnection and with no current flowing through the drive coils of the stepping motor.

Abstract: A circuit for a digital/analog converter comprising a shift register whose contents correspond to a value of an electrical magnitude, a control logic unit for controlling the shift register and an integration element for integrating the contents of the shift register to produce the value of the electrical magnitude.