Broadcast receiver tuning method - uses a number of potentio-meters supplying a tuning voltage to capacitance diodes

摘要

Each potentiometer is allocated to a reception channel, and the potentiometers can be one-by-one connected through a contact by a clock pulse generator. When the device is operated through the sequential remote control for reception channel selection, and a potentiometer is reached, not tuned to a sender, the clock pulse frequency is automatically multiplied, and again reduced when a potentiometer is reached, tuned to a sender. Square pulse signals from a store to a comparator with the input of the operational amplifier, connected with the selector, and the negative terminal of the operational amplifier connected to the reference potentional, the other terminal of which is earthed.