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Op-amp, four transistors and some example modules 811ef45c764021f623b8bb59234df1314fce4e91 12V, -12V and ground needed, probably up to 1amp - maybe not as efficient as a whole, provided Your use, reproduction, and distribution as defined by Sections 1 and 10 steps based on a regular polygon. ≥30 means "round, using current quality.

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