{"product_id":"42632","title":"Doepfer A-143-9 QLFO VC Quadrature LFO\/VCO","description":"\n\u003cp\u003eThe Doepfer A-143-9 is a voltage-controlled quadrature LFO and sine-wave oscillator capable of generating four phase-related outputs simultaneously. Based around a precision quadrature circuit, it produces exceptionally clean sine and cosine waveforms with very low distortion, making it useful for modulation duties, frequency shifting applications, and experimental audio-rate patching.\u003c\/p\u003e\n\u003cp\u003eThe module provides four outputs spaced 90 degrees apart:\n- Sine (0°)\n- Cosine (90°)\n- Inverted Sine (180°)\n- Inverted Cosine (270°)\u003c\/p\u003e\n\u003cp\u003eThese phase relationships make the A-143-9 particularly useful for complex modulation tasks, quadrature effects, panning, rotating control voltages, and frequency shifting applications.\u003c\/p\u003e\n\u003cp\u003eUnlike many sine-wave generators that derive their output from sawtooth or triangle wave conversion, the A-143-9's dedicated quadrature core produces highly accurate sine and cosine signals with exceptionally low distortion.\u003c\/p\u003e\n\u003cp\u003eThe frequency range spans from extremely slow modulation cycles lasting several minutes through to moderate audio frequencies in the low kHz range. Three operating ranges are selected via a front-panel toggle switch.\u003c\/p\u003e\n\u003cp\u003eTwo frequency control inputs are provided:\n- CV1 input without attenuation\n- CV2 input with bipolar attenuator\u003c\/p\u003e\n\u003cp\u003eWhile the module can operate as an experimental sine-wave VCO, it does not provide precise 1V\/octave tracking.\u003c\/p\u003e\n\u003cp\u003eTwo front-panel LEDs indicate the positive and negative portions of the sine waveform, providing useful visual feedback when working at low frequencies.\u003c\/p\u003e\n\u003cp\u003eOutput amplitude is approximately 5V peak-to-peak (±2.5V) and can be adjusted internally via a trimming potentiometer.\u003c\/p\u003e\n\u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eVoltage-controlled quadrature LFO and sine-wave oscillator\u003c\/li\u003e\n\u003cli\u003eFour simultaneous phase-shifted outputs\u003c\/li\u003e\n\u003cli\u003eSine, cosine, inverted sine, and inverted cosine outputs\u003c\/li\u003e\n\u003cli\u003eDedicated low-distortion quadrature oscillator core\u003c\/li\u003e\n\u003cli\u003eFrequency range from several minutes per cycle to low audio frequencies\u003c\/li\u003e\n\u003cli\u003eThree selectable frequency ranges\u003c\/li\u003e\n\u003cli\u003eTwo CV frequency inputs\u003c\/li\u003e\n\u003cli\u003eBipolar attenuator on CV2 input\u003c\/li\u003e\n\u003cli\u003eVisual waveform indication via dual LEDs\u003c\/li\u003e\n\u003cli\u003eAdjustable output level\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cp\u003e| Specification | Details |\n|---|---|\n| Outputs | 0°, 90°, 180°, 270° phase-shifted signals |\n| Waveforms | Sine, Cosine, Inverted Sine, Inverted Cosine |\n| Output Level | Approx. 5Vpp (±2.5V) |\n| Frequency Range | Several minutes per cycle to a few kHz |\n| CV Inputs | 2 |\n| 1V\/Oct Tracking | No |\u003c\/p\u003e\n\u003ciframe width=\"480\" height=\"270\" src=\"https:\/\/www.youtube-nocookie.com\/embed\/UdeIDjiVKcU?rel=0\u0026amp;showinfo=0\u0026amp;modestbranding=1\" frameborder=\"0\" allowfullscreen\u003e\u003c\/iframe\u003e\u003cp\u003eVideo: \u003ca href=\"https:\/\/youtu.be\/UdeIDjiVKcU\"\u003ehttps:\/\/youtu.be\/UdeIDjiVKcU\u003c\/a\u003e\u003c\/p\u003e\u003ch2 class=\"itemspec\"\u003eProduct Specs\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eItem Number:\u003c\/b\u003e 42632\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eMake:\u003c\/b\u003e \u003ca href=\"\/search?q=vendor%3ADoepfer+AND+tag%3Avisible\"\u003eDoepfer\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eModel:\u003c\/b\u003e \u003ca href=\"\/search?q=A-143-9+AND+tag%3Avisible\"\u003eA-143-9\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eCondition:\u003c\/b\u003e \u003ca href=\"\/pages\/gear-condition-key\" class=\"fs-product-condition fs-product-condition-brandnew\"\u003eBrand New\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eFinish:\u003c\/b\u003e Silver\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eCategories:\u003c\/b\u003e \u003ca href=\"\/search?q=tag%3Akeyboards-and-synths+AND+tag%3Avisible\"\u003ekeyboards-and-synths\u003c\/a\u003e ⇒ \u003ca href=\"\/search?q=tag%3Aeurorack+AND+tag%3Avisible\"\u003eeurorack\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eFunction:\u003c\/b\u003e \u003ca href=\"\/search?q=tag%3AEurorack+AND+tag%3ALFO+AND+tag%3Avisible\" class=\"btn btn--small\"\u003eLFO\u003c\/a\u003e \u003ca href=\"\/search?q=tag%3AEurorack+AND+tag%3AOscillator+AND+tag%3Avisible\" class=\"btn btn--small\"\u003eOscillator\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eMade In:\u003c\/b\u003e Germany\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eMPN:\u003c\/b\u003e A-143-9\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eModular Grid:\u003c\/b\u003e Eurorack \u003ca class=\"btn btn--small\" href=\"https:\/\/modulargrid.net\/e\/doepfer-a-143-9-lin-fm\" title=\"View Details\" target=\"_blank\"\u003eⓘ\u003c\/a\u003e \u003ca class=\"btn btn--small\" href=\"https:\/\/modulargrid.net\/e\/modules_racks\/add\/4847\" title=\"Add\" target=\"_blank\"\u003e＋\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eDimensions*:\u003c\/b\u003e 8 HP 50 mm deep\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003ePower*:\u003c\/b\u003e 30 mA +12V 30 mA -12V ? mA 5V\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cem\u003e* User contributed details\u003c\/em\u003e\u003c\/p\u003e","brand":"Doepfer","offers":[{"title":"Default Title","offer_id":47693777961196,"sku":"42632","price":179.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2604\/0858\/files\/Doepfer_A-143-9_sku_42632_MPN_A-143-9.jpg?v=1780285275","url":"https:\/\/foundsound.com.au\/products\/42632","provider":"Found Sound","version":"1.0","type":"link"}