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SC25 Discrete Op-Amp
The SC25 is an updated, "slightly improved" version of the API 2520 discrete op-amp. This all-discrete 13 transistor design retains the original's basic topology but uses a different compensation scheme, adds improved current sources, and employs more modern transistors throughout. The SC25 is best used in circuits with medium to high source impedance and with mic input transformers with 1:8 or higher turns ratios