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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
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.