FSK Demodulator-Tone Decoder with RC2211N
A monolithic phase locked loop for data communications. The IC contains a basic phase locked loop for tracking an input signal within the pass band, a quadrature phase detector which provided carrier detector and an FSK voltage comparator which provides FSK demodulation. In the circuit shown, the IC is used as an FSK demodulator such as would be found in the receiver circuit of a modem. The table below shows the component values required for a modem demodulator using standard European tones on the public switched network. [...]
Read More Source:http://www.next.gr/inside-circuits/FSK-Demodulator-Tone-Decoder-with-RC2211N-l5858.html
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DTMF Decoder with LCD Display
The DTMF decoder can be directly connected to a Serial port to view the digits in HyperTerminal on a computer. The decoder stores the last 234 received digits in EEPROM. The contents of EEPROM can be viewed on the LCD screen via two scroll buttons.
Total power consumption is 12mA. The DTMF decoder has two inputs. A RJ11 jack for connecting to the phone line and a 1/8″ audio jack for connecting to a scanner, tape recorder or other audio output device.
Read more original source: http://www.infidigm.net/projects/dtmf2/
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Latching The 567 Output By IC Tone Decoder 567
Latching The 567 Output By IC Tone Decoder LM567
1 circuit is model Manual Reset. 2 circuit parts are model Logic Reset.
The 2 both of circuits show the value that necessary only. For RL be Load of the circuit. The output will liberate a signal is unfinished forever although will discharge way leg signal input then follow.
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