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Prechamp: 2-Transistor Preamplifier PCB [01107941] PCB for the Prechamp: 2-Transistor Preamplifier. Double-sided PCB with plated through holes, solder mask and silkscreen overlay. 46 x 36mm. Cat No SC0874. Price: AUD $5.00 1  Add to trolley In stock: yes (25 available). Estimated dispatch time: 1-3 days Related to: Project: The PreChamp 2-Transistor Preamplifier (July 1994 [online issue]) Feature: How To Do Your Own Loudspeaker Measurements (December 2011 [online issue]) Project: Infrasound Detector For Low Frequency Measurements (March 2013 [online issue]) Other items relevant to these projects: The PreChamp 2-Transistor Preamplifier: Silicon Chip article scan, July 1994 - The PreChamp 2-Transistor Preamplifier ($10.00) Add to trolley PreChamp 2-transistor preamplifier PCB pattern (PDF download) [01107941] (Free) Add to trolley Infrasound Detector For Low Frequency Measurements: Champ: Single Chip Audio Amplifier PCB [01102941] ($5.00) Add to trolley