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High Gain Audio Amplifier SK-201 A high gain audio amplifier electronics kit. Use the internal speaker to listen to audio from other kits in this line. Gain is over 68 db. Includes transistor input stage, audio amplifier IC (integrated circuit) output stage, illustrated instructions, all parts and nice case. PCB has silk screen and solder mask Outputs One watt. Requires 9 Volt battery (not included).