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Kassutronic's KS-20 https://kassu2000.blogspot.com/2019/07/ks-20-filter.html ** 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 single output Power Module uPOL MUN12AD01 Power Module uPOL MUN12AD03 Meanwell DCDC non-isolated converter SIP module, http://www.meanwell.com/webapp/product/search.aspx?prod=nid30 Isolated 1W single output DC/DC, http://power.murata.com/data/power/ncl/kdc_cre1.pdf Isolated 1W or 2W Single and Dual Output, 1500VDC Isolation.

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