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Alternative: CV from something else VCF MK's Diode Ladder VCF 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 or 2W Single Output SM DC/DC Converters 78sr3.3 78sr5 78sr9 78sr12 78srXX DCDC-Converter, RECOM, RECOM_R-78E-0.5, SIP-3, pitch 2.54mm, package size 11.5x8.5x17.5mm^3, https://www.recom-power.com/pdf/Innoline/R-78HBxx-0.5_L.pdf DCDC-Converter, RECOM, RECOM_R-78B-2.0, SIP-3, pitch 2.54mm, package size 69.98x30x15.64mm, https://silvertel.com/images/datasheets/Ag5810-datasheet-IEEE802_3bt-Power-over-Ethernet-4-pair-PD.pdf DCDC-Converter.

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