On 6 Jan 2008 at 22:32, Sean Breheny wrote: > I could use a transformer, but I'd like to avoid it for several > reasons all relating to the fact that it doesn't have good low > frequency response. I think if you use a 50:1000 ohm transformer and load the secondary with the 10.000 ohm of your amplifier, the low frequency response won't be affected. Have you experimented with one of those microfone transformers? Even a 600:10000 ohm will give you an idea of the performance. Mark Jordan -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist