{"product_id":"4u031-73-vcf","title":"4U031 - '73 VCF","description":"\u003cp\u003e\u003cstrong\u003e4U031 - '73 VCF\u003cbr\u003e\u003cbr\u003e\u003c\/strong\u003eThis is the very first filter, that was introduced in the paperface era, know as the R12 VCF.\u003cbr\u003eIt is a state variable, 2 pole, 12dB\/oct LP,  HP, 6dB slopes on the BP, it does not self oscillate.\u003cbr\u003eThe circuit consists of a voltage processor, allowing the filter frequency to respond either\u003cbr\u003eproportionally or inverse-proportionally to the incoming CV.\u003cbr\u003eThe output of the voltage processor is then fed to a pair of exponential converters that\u003cbr\u003econtrol the gain of the CA3080 transconuctance amplifiers in the filter core,\u003cbr\u003ethus varying the frequency.\u003cstrong\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/strong\u003eThis version has all the well know mods, like an LED for visual feedback and also the\u003cbr\u003etrigger (ping) input.\u003cbr\u003e\u003cbr\u003ePCB:\u003cbr\u003e\u003cspan\u003e1.6 mm thick, double sided, green\u003cbr\u003ebase material FR4-Standard TG 135-140\u003cbr\u003esurface finish \u003cspan class=\"detail-value\"\u003e\u003cspan class=\"detail-span2\"\u003eHASL\u003c\/span\u003e\u003c\/span\u003e\u003cbr\u003epart values are silkscreened\u003cbr\u003e\u003cem\u003eall panel mount!\u003c\/em\u003e\u003cbr\u003e\u003cbr\u003eFront panel\u003cbr\u003e\u003cstrong\u003e1.6 mm, PCB material with colour front print that \"mimics aluminium\"\u003c\/strong\u003e\u003cbr\u003e2\" x 175 mm\u003cbr\u003emounting holes - 3.5 mm, follows the LW specification (top and bottom)\u003cbr\u003e\u003cem\u003eplease note, minor imperfection may occur\u003c\/em\u003e\u003cbr\u003e\u003cem\u003eno parts, just the PCB and panel\u003c\/em\u003e\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0664\/5635\/5083\/files\/4U031.pdf?v=1785396397\" target=\"_blank\" rel=\"noopener\"\u003e\u003cstrong\u003eDocumentation\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"4U Shop","offers":[{"title":"Default Title","offer_id":53218352660747,"sku":null,"price":59.99,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0664\/5635\/5083\/files\/4U031_site.png?v=1783067525","url":"https:\/\/4ushop.eu\/products\/4u031-73-vcf","provider":"4U Shop","version":"1.0","type":"link"}