LM386N audio preamp circuit

Here’s a circuit that provides some gain to iPod line-out audio to drive the TXD pin of a Radiometrix NTX2. It uses an LM386N audio amplifier chip (available from Radio Shack).  I just substituted capacitors until it worked. Its powered by +5v DC from an Arduino pin.

Roughly based on this circuit –  http://www.instructables.com/image/FTZUHWBGD2J36P8

Next will be trying the TS922 op amp.