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OCR: Sianal amplifier From uf filter Signal channe detector paper Low- pass output 7.2 170 insert gifference 22 M MM amplf fier here 47 K uf 10 ut WWWWW 4.7 K paper 080000 One .milli iampere One -mit iampere fast- sianal fast signal w meter strip -chart 500 2.700 9v recoraer 4.7 K 33 M W 100 WM WW paper paper paper Noise channci Zero switch -rate circuit Filter recorder Frorm channei aifference amplif 000000 lone siqnal char1 Nniee channel crossnc Count