Michael Watterson ha scritto: > Oh. long ago. I think 0dB into 600 Ohms from 600 Ohms source is 775mV on > the line. (1mW in load maybe) > so if you have opamp or low Z source, you have 1.55 V driving 600Ohm > resistor. Normally it's balanced so non-inverted and inverted both > driving 300 Ohms in series with output connector. Load is then also 600Ohms Yes, agreed. What about, specifically, the "driver" i.e. shall I use a 600ohm 1:1 transformer? And, then, any suggestion for the power-supply with superimposed sinewave? A little DC-DC, or something alike..? -- Ciao, Dario -- Cyberdyne -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist