How does the circuit of 8-lineintercommunication using 89c51? And for more information it consist the DTMF MT8870 and analogue switch. And for hand off and hand on operattion it uses the LM339 is used.
2007-03-13 21:17:30 · 3 answers · asked by vipul_chandr 1 in Consumer Electronics ➔ Land Phones
I'm going to take a stab at this when I say I think you're talking about building this 8-line intercom out of a 89C51 microcontroller:
http://www.electronics-lab.com/projects/telephone/017/index.html
While Ashad's instructions aren't the clearest, you should take a look at these other intercom circuits. Perhaps once you have a better understanding how a basic intercom works electrically, that will help you build something more complex like the 8 line version complete with mictrocontroller. Here are some other intercom circuits:
http://www.discovercircuits.com/A/au-intercom.htm
2007-03-15 11:13:01 · answer #1 · answered by Geoff S 6 · 0⤊ 0⤋
Purple.
2007-03-14 01:01:31 · answer #2 · answered by joshnya68 4 · 0⤊ 1⤋
It doesn't. They are not compatible.
2007-03-16 13:30:14 · answer #3 · answered by Anonymous · 0⤊ 0⤋