I have made class d amp with differential input stage.....its single supply and on same GND line i have preamplifier which has one output......how to connect that two and keep differential input to be differential?...if possible without using an audio transformer....
Can you be a little bit more specific? For instance: What do you mean with a preamp with one output?
I am facing the same problem. The class d board mfr says just connect the preamp to one wire and ground, leaving the third wire open.
I dont believe that its the proper solution but worth a try.
I dont believe that its the proper solution but worth a try.
It is the proper way to do it. Differential input amplifies the difference between the positive input and the negative input of a balanced signal. The ground pin, pin1 of the XLR has nothing to do with audio. If a unbalanced input signal is connected, one simply connects the signal wire to positive input and the shield/ground to the ground of the amplifier. The negative input can be left unconnected or if you want, tide to ground. The last option can also be done via an RC filter, but that's up to you.
It's single supply, so a DC blocking caps will probably be needed here (same rating as used on positive input).
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