Circuit includes a rectifier diode and filter capacitor, and can be AC or DC powered. The left control is a tone control, and the right is a volume control, with on-off switch. The green wires are the speaker output connections. The black and white wires, connect to the switch on the back of the potentiometer. The connections for signal input and power, are through holes on the board, labeled on bottom. Requires a 6-11 VAC, or 9-15 VDC power source. (See our other listings for a suitable AC adapter). Use with 8-ohm or higher impedance speakers. These are unused and untested. Handy little amplifier! Comes with a FREE vintage 2-1/4 inch speaker (8 ohm, 200mW). Speaker may have scratches/marks, and their may be some corrosion on the back, but is still fully functional.
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