Introduction - If you have any usage issues, please Google them yourself
The control core uses 8 bit cheap 51 Series MCU to complete the system signal analysis, password management, man-machine dialogue and the corresponding control.
Decoding of 2 using DTMF special chip set MT8870 chip for decoding DTMF signal.
3 language prompting circuit: telephone remote control system using speech man-machine communication. The voice prompt circuit using model 600 section of monolithic high-quality voice recording circuit ISD2500 produced by ISD company, complete language tips section circuit design.