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BackFile 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.
- PD-30S, http://www.cui.com/product/resource/pd-30s.pdf connector 3-pin PD-30.
- 19.60mm diameter 21.8mm Bourns 2100 L_Toroid, Horizontal series.