Published:2011/8/9 18:22:00 Author:Vicky | Keyword: auto-adjustment , telephone ring | From:SeekIC
Auto-adjustment circuit of the telephone ring
The above picture is the auto-adjustment circuit added into the HA18(ⅤⅡ) P/ TSD type telephone (the circuit within the dotted frame is the original circuit of the telephone.). With the increasing numbers of the ring times, the gradual change of the ring volume and tone can be achieved and also the goal of control thr ringing procedure can be reached. The whole device needs no peripheral power supply. The circuit is simple and reliable. In addition , it does not affect the communication line.
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