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Back** uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on this one, Number of indenting cones. [mm] cone_indents_height = 5.1; .
- 38mm length 29.85mm diameter 13.97mm.
- Current transducer (https://www.lem.com/sites/default/files/products_datasheets/hx%203_50-p_sp2_e%20v07.pdf LEM HX25-P-SP2 hall.