Signaling horn for adapting an operating value tune-in to a preset set point value has a switch to control an exciter current regarding pulse frequency/pulse duty factor and a control circuit to detect an operating value.

摘要

A switch (5) controlled by a pulse generator (6) controls pulse frequency/pulse duty factor of exciter current (I) flowing through a signaling horn (1). A control circuit has circuit blocks (8-12) to detect an operating value for the signaling horn and to control the pulse generator by relying on the fact that the operating value for the signaling horn accepts a set point value. Adjustments can be made for temperature and aging.