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May contribute to the wide range of in-tune response, but comments discuss potential fixes, maybe worth it for a 1uF capacitor; expand a bit, but also size it for a 5mm led, with a diameter between 16-19 mm: https://www.keyelco.com/product.cfm/product_id/826 Keystone #500, 12mm CR1220 battery holder, http://www.keyelco.com/product-pdf.cfm?p=710.

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