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** uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on SIP7, http://power.murata.com/data/power/ncl/kdc_nma.pdf Isolated 1W or 2W Single Output SM DC/DC Converters 78sr3.3 78sr5 78sr9 78sr12 78srXX DCDC-Converter, RECOM, RECOM_R-78HB-0.5, SIP-3, pitch 2.54mm, size 5.54x6.2mm^2, drill diamater 1.3mm, pad diameter 2.6mm, see http://www.4uconnector.com/online/object/4udrawing/10694.pdf, script-generated with , script-generated with , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_Philmore THT Terminal Block 4Ucon.

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