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BackBGA-28 4.0mm x 6.25mm package, pitch 0.4mm; see section 7.4 of http://www.st.com/resource/en/datasheet/DM00366448.pdf WLCSP-168, 12x14 raster, 4.891x5.692mm package, pitch 0.4mm pad, based on the footprint. Some options: Bourns PTL series, such as: ** https://www.mouser.com/ProductDetail/Bourns/PTL30-15O0-105A2?qs=fV9UsjselOEqdQiKFAm%2Fog%3D%3D (A1M, orange LED, 30mm travel, 15mm shaft https://www.digikey.com/en/products/detail/bourns-inc/PTL30-15R0-103B1/3781301 (red B10K) and https://www.digikey.com/en/products/detail/bourns-inc/PTL30-15O0-105A2/7314942 (orange A1M) The first Fireball run used 10.25mm, but this painted us into a corner // is placed on the Program) on a decade counter with internal clock rate. - One potentiometer for internal clock rate. Switches: Momentary-normal-off pushbutton to manually step. - SPST switch per step, to set output voltages. (10) - One SPST switch per step, to set clock rate (if onboard clock is used) (rv11 // 1 for cv glide atten (rv15 // 13 SPDT switches (many used as SPST - 2 x switching (normalling) stereo jack (T/TN/R/RN/S), https://www.neutrik.com/en/product/nj5fd-v 6.35mm (1/4 in) Vertical Jack, Non-switching stereo.
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