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heavier duty pocket amplifier

I was in need of a pocket sized powered amplifier, so I made this:
https://www.instructables.com/id/Simple-Powered-Pocket-Amplifier/
However, I need to run larger speakers off of it, 6.5" woofers, and I need to get decent sound out of it. When I ran more power through my pocket amp (6v. battery pack rather than 3v.) I fried the circuit and had to make a new one. Any suggestions for a pocket sized, powered amplifier that can power said speakers? the amp and battery pack must be concealable in a suit.

Picture of heavier duty pocket amplifier
NachoMahma9 years ago
. Search for "audio amp +schematic" and pick the one that fits your needs.