Call signal generation circuit

Abstract

Abstract PURPOSE:To obtain a small and light call signal generation circuit, by providing a DC-DC converter, an amplifier having a bias power source terminal supplied from the outside, and a small call signal oscillator. CONSTITUTION:The titled circuit is constituted of the DC-DC converter 1 having a midpoint 7 on a secondary side coil, a DC-DC converter control means 4 consisting of an output current detecting part 42 which detects the output current of the DC-DC converter 1 when it exceeds a constant level, and a converter control part 41 which stops the operation of the DC-DC converter 1 by the output of the detecting part 42, the call signal oscillator 3, and the amplifier 2 consisting of a driving stage 21 having another power source terminal 8 to amplify the output of the oscillator and an output means 22 being operated by the output voltage of the DC-DC converter. Then, the midpoint of the output coil of the DC-DC converter is biased by a DC voltage (-48V). In such a way, the small and light call signal generation circuit can be obtained.

Inventors

• 👤 Hideaki Honma
• 👤 本間　英昭

Bibliographic Details