biffloman

audioguru Can you suggest a better quality AC adaptor and a place to purchase online Thanx

I have a small personal sound amplifier - essentially a mic with a headphone jack - that is powered by a single AAA bat. I use this quite a bit and wanted to mod it so that I could plug it into the AC outlet. I soldered wire to each bat terminal and then connected the wires to a variable AC adaptor. When set at 1.5V I get amplification similar to while on bat power but there is a terrible whistle. If I bump the voltage to 3v I get less whistle but less amplification as well. Suggestions?