{"product_id":"doepfer-a-101-6-6-stage-opto-fet-vcf-special-order","title":"Doepfer A-101-6 6 Stage Opto FET VCF (Special Order)","description":"\u003ch4\u003eSpecial Order - Estimated 4 - 8 Week Turn Around - Reserve Yours Now\u003c\/h4\u003e\n\u003cdiv class=\"uk-panel uk-margin\"\u003e\n\u003cp\u003e\u003cspan\u003eA-101-6 is a filter module that uses so-called opto FETs to control the filter frequency. Opto FETs are very similar to Vactrols but use \u003c\/span\u003e\u003cspan\u003elight depending field effect transistors (FETs) instead of \u003c\/span\u003e\u003cspan\u003elight depending resistors (LDRs). \u003c\/span\u003e\u003cspan\u003eA opto FET is a combination of a light depending FET and a LED (light emitting diode) both put into a small light-proof case. The advantage compared to vactrols is the much faster response of opto FETs compared to LDRs. This allows much faster attack\/decay times and even FM effects. The disadvantage compared to vactrols is that the FET behaves as a \u003c\/span\u003e\u003cspan\u003enormal Ohm resistor only for small levels. With higher levels the FET begins to distort. Apart from this the notes mentioned on the Vactrol Basics page are valid.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eModule A-101-6 is made of six serial 6dB filter stages. Each stage can work as lowpass, highpass or one of two allpass types.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eCondition: New\u003cbr\u003e\u003cbr\u003eInfo from Alex4\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Doepfer","offers":[{"title":"Default Title","offer_id":48340746961066,"sku":null,"price":127.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0517\/4699\/6394\/files\/image_016518c9-0785-4144-a574-7a6e8feade53.png?v=1779479335","url":"https:\/\/www.missionsynths.com\/products\/doepfer-a-101-6-6-stage-opto-fet-vcf-special-order","provider":"Mission Synths","version":"1.0","type":"link"}