hospital bed pager

Relevant key device information applied in this article: C304 TWH9236B TWH9238B CD4511 NE555 9013 Call transmitting circuit: Call receiving circuit: The call sound circuit is composed of the sound circuit KD9561 and the speaker, which is controlled by the control circuit to sound. When the receiving circuit receives and decodes effectively, Io outputs a positive pulse. This pulse causes the relay K to close through the control circuit and turns on the working power of the KD9561 to make it sound.