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In a pinch or to experiment, you can use any of these transformers. low Z goes to the player, hi Z goes to the intercom. beware do not connect a high power player to a step-up transformer (low volts or Ohms on one side, hi volts or Ohms on the other), there is such a thing as feeding too much...

I forgot all about the audio input..

You can try the circuit. It looks like it provides voltage gain. It appears as though it would. R1 should be changed to 32 ohms and R2 to 76 ohms. Use the standard values of 33 ohms and 75 ohms. For an ipod, R1 need be only a common 1/2 watt or 1/4 watt size. An issue might arise because the...