{"product_id":"fairfield-circuitry-20-more-slew-limiting-distortion-2245060","title":"Fairfield Circuitry 20% More Slew Limiting Distortion Pedal","description":"\u003cp\u003eExplorations around a schematic found among old papers of mysterious origin, suspiciously similar to a datasheet sq\/tri oscillator. All that was needed was to connect the dots.  \u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSLEW LIMITER CORE\u003c\/strong\u003e\u003cbr\u003eA slew limiter smoothes out how quickly incoming voltage can change, limiting it to a fixed v\/sec. slope. since time and frequency are intrinsically linked, this acts as a steep, somewhat distorted low pass filter.\u003c\/p\u003e\u003cp\u003eWhen it resonates (FEED), these fixed slopes become triangle wave oscillations, giving 20% more its unique sound. Your input signal can overwhelm this oscillation, making for pseudo-wavefolding and synthetic distortion artifacts.\u003c\/p\u003e\u003cp\u003eThis topology can result in quite a dark sound when SLEW is low, as there will not be much harmonic content present beyond the cutoff frequency. You can use BLEND to mix in a square wave signal that can help bring back some higher harmonics.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eLOW PASS GATE\u003c\/strong\u003e\u003cbr\u003e20% More has a slightly resonant, 2 pole, 12dB\/oct low pass filter at it's output. It offers a nice counterbalance to the grit of the slew limiter, and allows tasteful reigning in of the crackling potential present in the circuit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eENVELOPE FOLLOWER\u003c\/strong\u003e\u003cbr\u003eThere is a simple internal envelope, its main purpose is to allow high feedback settings while avoiding (possibly unwanted) oscillations when no input is present. Both envelope destinations achieve this through different means.\u003c\/p\u003e\u003cp\u003eWhen the envelope goes to the LPG, it is a bit like a sidechain input, where your playing dynamics open up the filter and let highs pass through, giving some nice springy west coast bongos; the LPG knob needs to be set low for the gating to be effective.\u003c\/p\u003e\u003cp\u003eWhen the envelope goes to FEED, the average feedback is lowered slightly, loud playing will bring it back up. As loud inputs also fight the oscillations, interesting swashes of noise arise as your notes decay.\u003c\/p\u003e\u003cp\u003eTwo flip-flop based clock dividers, giving sub-octave and sub≠ sub-octave effects. It is only heard when BLEND is up somewhat. The sub octave is summed through diodes, giving it a characteristic 75% pulse.  \u003c\/p\u003e\u003cp\u003ePlay with INPUT. Interactions become intuitive.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFULL WAVE RECTIFIER\u003c\/strong\u003e\u003cbr\u003eEnvelope following requires a strictly positive input voltage. To achieve this, a full wave rectifier circuit is used. It is repurposed in the audio path as a switchable octave up. This particular implementation squishes very hard when INPUT is beyond noon. Enjoy.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCONTROLS\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eINPUT:\u003c\/strong\u003e 'Mu amp' jfet preamp, lots of gain\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBLEND:\u003c\/strong\u003e Mixes in a square wave\/ sub-octave copy of the signal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVOLUME:\u003c\/strong\u003e Output volume, gets very loud\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSLEW:\u003c\/strong\u003e Slew limiter frequency\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFEED:\u003c\/strong\u003e Slew limiter feedback\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLPG:\u003c\/strong\u003e Low pass filter\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eD\u003c\/strong\u003e - OCTAVE DOWN clock division of the blended square wave, -1 or -2 oct\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eU\u003c\/strong\u003e - OCTAVE UP analog octave up, full wave rectifier\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eE\u003c\/strong\u003e - ENVELOPE DESTINATION routing of the internal envelope, either added to the (L)PG or (F)EED controls\u2028\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eINTERNAL CONTROLS\u003c\/strong\u003e\u003cbr\u003eThere are two user adjustable trimpots inside the pedal; they are labeled TR3 (drive) and TR2 (sens). The two other trimmers set the jfet bias and v\/oct calibration, they should not be adjusted by the user.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDRIVE\u003c\/strong\u003e\u003cbr\u003esets the amount of signal going into the JFET clipping stage, another 20% more?\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSENS(ITIVITY)\u003c\/strong\u003e\u003cbr\u003eSets the gain of the internal envelope, allowing you to attenuate or exaggerate the response to your playing dynamics.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eTECHNICALS\u2028\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003edimensions\u003c\/strong\u003e: 4. 7\" X 3.8\" X 1.9\"\u2028\u003cbr\u003e\u003cstrong\u003ecv input range\u003c\/strong\u003e: 0 - 5v normal ; 0 - 8v max 9VDC\u003cbr\u003e\u003cstrong\u003epower supply\u003c\/strong\u003e: 20 mA@ 9.6 VDC\u003c\/p\u003e","brand":"Fairfield Circuitry","offers":[{"title":"Default Title","offer_id":42499563487367,"sku":"FAIR-20MORE","price":499.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0343\/4368\/2183\/files\/fairfield-circuitry-effects-and-pedals-distortion-fairfield-circuitry-20-more-slew-limiting-distortion-pedal-fairfield-circuitry-20-more-slew-limiting-distortion-pedal-fair-20more-1151712183.jpg?v=1768666881","url":"https:\/\/www.chicagomusicexchange.mom\/products\/fairfield-circuitry-20-more-slew-limiting-distortion-2245060","provider":"Chicago Music Exchange","version":"1.0","type":"link"}