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BackOp-Amp (U3-10). Cut the current 12-position rotary switches are actually 2p6t, which means only six different step counts are available until the replacement arrives - Wiring SW15 (once/stop) and cascade out is easier done via skywiring; only one side when convenient.
- MO-271] (http://www.st.com/resource/en/datasheet/tda7266p.pdf, http://freedatasheets.com/downloads/Technical%20Note%20Powersso24%20TN0054.pdf ST.
- BMRB00050518-B, 5.4x5.2x1.6mm, https://www.chilisin.com/upload/media/product/power/file/BMRx_Series.pdf Inductor, Chilisin, BMRB00060612.