Telephone number sending circuit diagram
Source: InternetPublisher:难得正经 Keywords: Wireless communication telephone number sending circuit diagram Updated: 2020/08/09
The dialing circuit of the telephone is shown in the figure below. U8 is a special integrated circuit for dialing, and the model is 145409. U12 (22100) is a 4X4 cross matrix circuit (CD22100, also known as four bidirectional switches), which is used as the control circuit of U8.
Latest Communication Circuits Circuits
- Why does CAN FD communication need to enable TDC for sending and receiving delay compensation? How to configure TDC and SSP in TCAN4550?
- Methods to reduce mutual coupling between antenna elements
- Application of GaN power devices in array radar transceiver systems
- Circuit principle and production of six-tube radio
- 1W FM Broadcast Transmitter
- AM Transmitter
- RXM-900-HP-II FM/FSK 928～902 MHz Receiver Module
- GPS RF front-end circuit composed of MX2740
- Rolling code radio transmitter circuit (HSC360/TDA5100)
- MAX2900/2901/2902 BPSK/ASK/OOK 915/868 MHz Transmitters
Popular Circuits
- CC4528 dual monostable flip-flop design multivibrator circuit diagram
- DIY a simple FM wireless microphone
- Application of power supply filtering and decoupling network
- FM radio circuit diagram using FET
- JFET amplifier with input impedance of 500M
- 60Hz time base generator composed of MM5369
- Typical super regenerative radio receiver circuit diagram
- Keyed oscillator circuit diagram designed by CC4528
- Personnel positioning system control module circuit design
- Wireless communication system circuit module design circuit diagram based on nRF401
京公网安备 11010802033920号