| ??? 06/17/05 17:32 Read: times |
#95201 - But if there is no way... Responding to: ???'s previous message |
Hello dear Reza
Andy and Ijaz said all you must know But if there is no way to use DTMF signalling yet I think you have only one way assume the connection is established(your statement) When you press key #9 ,a small sound (click that andy said) can be heard in B_party's phone set, you need to amplifying this click, Maximum amplitude of this click is less than 0.8 volt carried on 6-8 volt you know,when hook is off the line voltage drops in to 6-8 volt So you need to an analogue circuit to change this range of voltage to 0 and 5 for your control unit |
| Topic | Author | Date |
| Pulse Detection | 01/01/70 00:00 | |
| Discussed here | 01/01/70 00:00 | |
| I'll check it | 01/01/70 00:00 | |
| Detect where? | 01/01/70 00:00 | |
| pulse detection | 01/01/70 00:00 | |
| I doubt it. | 01/01/70 00:00 | |
| Re: I doubt it | 01/01/70 00:00 | |
| Unlikely to work | 01/01/70 00:00 | |
| First MicroController Project | 01/01/70 00:00 | |
| Look over here,,,, | 01/01/70 00:00 | |
Cliche | 01/01/70 00:00 | |
| But if there is no way... | 01/01/70 00:00 | |
| tricky | 01/01/70 00:00 | |
| Last Speech! | 01/01/70 00:00 | |
| Thanks | 01/01/70 00:00 | |
| Thanks | 01/01/70 00:00 |