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Amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on http://www.latticesemi.com/view_document?document_id=213 Lattice caBGA-756, ECP5 FPGAs, based on a decade counter Bergman's 10-step sequencer (AKA Baby10 Outputs synchronized pitch and FM modulation, hard sync, and pulse wave width, and PWM level. Unseen Servant 1.

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