Hi, I have a single 2 watt, 8 ohm speaker from an old radio that i wired directly to a headphone audio jack and tried it in my phone. as you can probably guess, my phones speakers are much louder. How could i make a basic transistor amplifier that could give decent volume from the speaker? I have seen many circuit diagrams for this but i don't know how a device would be connected to them. Any schematics that would suit this application would be greatly appreciated.