DIGITAL MODULATOR CIRCUIT - Electronic Circuits Projects Diagrams Free

TDE · 18th January 2003, 03:02 AM

I need a circuit that I can take an 8 bit digital data signal and modulate it
onto a standard telephone line, and if possible a second circuit to demodulate the signal to recover the 8bit data, I would like these circuits
to be easy to construct

**kinjalgp** · 18th January 2003, 04:34 AM

For 8-bits or more you'll require a complete MODEM on both ends of the telephone line. No other smaller alternative.
If you want only 10-12 numbers to be transmitted/received, you can use UM91214 DTMF generator and KT3170 DTMF decoder ICs.
Remmber, hooking up anything to your telephone line without permission of telephone company is illegal.

bogdanfirst · 18th January 2003, 03:47 PM

why dont you try to use a parallel to serial converter and then on the other end a serial to parallel converte?

**kinjalgp** · 19th January 2003, 03:51 AM

Without modulation data can not be transmitted over telephone line. Even if you Serial to parallel and parallel to serial converters, MOD/DE-MOD will be required.

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18th January 2003, 03:02 AM	(permalink)
TDE	DIGITAL MODULATOR CIRCUIT I need a circuit that I can take an 8 bit digital data signal and modulate it onto a standard telephone line, and if possible a second circuit to demodulate the signal to recover the 8bit data, I would like these circuits to be easy to construct __________________ I need a circuit that can take an 8bit digital signal and modulate it onto a standard telephone line, and then a demodulator circuit to recover the data---I want this to be an easy to assemble project! --can anyone help!!!

18th January 2003, 04:34 AM	(permalink)
kinjalgp	For 8-bits or more you'll require a complete MODEM on both ends of the telephone line. No other smaller alternative. If you want only 10-12 numbers to be transmitted/received, you can use UM91214 DTMF generator and KT3170 DTMF decoder ICs. Remmber, hooking up anything to your telephone line without permission of telephone company is illegal. __________________ "There is no way to peace, peace is the way!"

18th January 2003, 03:47 PM	(permalink)
bogdanfirst	why dont you try to use a parallel to serial converter and then on the other end a serial to parallel converte?

19th January 2003, 03:51 AM	(permalink)
kinjalgp	Without modulation data can not be transmitted over telephone line. Even if you Serial to parallel and parallel to serial converters, MOD/DE-MOD will be required. __________________ "There is no way to peace, peace is the way!"