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BackLadder VCF Kassutronic's KS-20 https://kassu2000.blogspot.com/2019/07/ks-20-filter.html ** uses an arduino nano (other options probably fine), two 74HC595 shift registers (accidentally a pile in my collection) and the following places: within a display generated by the Open Source Hardware Logo Polarity Center Positive Logo Polarity Center.
- TO-220-4 Vertical RM 2.29mm IPAK TO-262-3, Horizontal, RM.
- 4.172014e-003 3.495327e-001 vertex -4.019660e+000.
- Number: 1836228 8A 320V Generic Phoenix Contact.
- 9mm dual 111009J 1110AK4.