{"product_id":"instruo-i-o47","title":"INSTRUO I-O47","description":"\u003cp class=\"p1\"\u003eI-ō47 Multimode Resonator\/Filter draws its circuit design inspiration from the classic 1047 module of the ARP2500 system.\u003c\/p\u003e\r\n\u003cp class=\"p1\"\u003eBuilt upon the classic circuit architecture of the original, the design was refined with extensive experimentation using modern components along side classic configurations of discrete parts.\u003c\/p\u003e\r\n\u003cp class=\"p1\"\u003eThe internal VCA’s are a new hybrid design of matched transistors and precision op-amps.\u003c\/p\u003e\r\n\u003cp class=\"p1\"\u003eVarious refinements were also added such as voltage control over the variable notch offset which opens new worlds of dynamic sweeps and shaping.\u003c\/p\u003e\r\n\u003cp class=\"p1\"\u003eThere are two audio inputs on the I-ō47. The top runs through a gain stage, set by the fader, and has an optional limiter in line with it selected by the LIM toggle switch.\u003c\/p\u003e\r\n\u003cp class=\"p1\"\u003eThis limiter is an implementation of the tanh wave shaper circuit which applies the soft curvature of the tanh expression to any input signal. The gain fader sits before the limiter allowing for precise control over the amount of warm saturation that occurs with this style of limiting.\u003c\/p\u003e\r\n\u003cp class=\"p1\"\u003eWith a simple sawtooth wave, the limiter will gently curve the ramp and result in subtle enhancement of the low end of the signal’s tone.\u003c\/p\u003e\r\n\u003cp class=\"p1\"\u003eFor more complex audio signals (drum voices work a treat!) the limiter will give very musical results akin to gentle compression\/overdrive, all the way to limiting and saturation.\u003c\/p\u003e\r\n\u003cp class=\"p1\"\u003eThe inverting input inverts the polarity of the input signal. This input is also directly affected in amplitude by the Q (resonance) control. As resonance increases, the signal amplitude will decrease, acting as a form of automatic gain compensation.\u003c\/p\u003e\r\n\u003cp class=\"p1\"\u003eBoth inputs can be used simultaneously to mix two independent audio signals.\u003c\/p\u003e\r\n\u003cp class=\"p1\"\u003eThe variable Notch effectively crossfades between branches of the low-pass and high-pass signals. The result is an offset notch response that can shift up or down a couple of octaves from the centre frequency.\u003c\/p\u003e\r\n\u003cp class=\"p1\"\u003eThis part of the circuit was inspired directly from the 2500’s 1047 variable notch control.\u003c\/p\u003e\r\n\u003cp class=\"p1\"\u003eCV was added by means of an optimised linear crossfading VCA pair. (The versatility of the variable notch output became apparent early on in development, so CV control was made a priority!)\u003c\/p\u003e\r\n\u003cp class=\"p1\"\u003eQ (resonance) is CV controllable.\u003c\/p\u003e\r\n\u003cp class=\"p1\"\u003eThe feedback toggle sends an additional branch of the band-pass signal to the non-inverting input and allows for stable self oscillation of the Filter. It can be used to kick the resonance response up a gear.\u003c\/p\u003e\r\n\u003cp class=\"p1\"\u003eThe strike input can be used to ‘ping’ the resonance of the filter. It is designed to respond to signals at audio rate which allows for its use as an input for square wave tones.\u003c\/p\u003e\r\n\u003ch3 class=\"p1\"\u003e\u003cspan\u003eSize\u003cbr\u003e\u003c\/span\u003e\u003c\/h3\u003e\r\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003e14HP\u003cbr\u003eDepth: 27mm\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\r\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cspan\u003ePower\u003c\/span\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/h3\u003e\r\n\u003cp\u003e\u003cspan class=\"s1\"\u003e+12V: 50mA\u003cbr\u003e\u003c\/span\u003e\u003cspan class=\"s1\"\u003e–12V: 50mA\u003c\/span\u003e\u003c\/p\u003e\r\n\u003ch3 class=\"p1\"\u003e\u003cspan\u003eSpecifications\u003cbr\u003e\u003c\/span\u003e\u003c\/h3\u003e\r\n\u003cul\u003e\r\n\u003cli class=\"p1\"\u003eCentre frequency range 16Hz to 16KHz\u003c\/li\u003e\r\n\u003cli class=\"p1\"\u003e1V\/octave, Coarse and Fine frequency controls\u003c\/li\u003e\r\n\u003cli class=\"p1\"\u003eFM input with attenuverter\u003c\/li\u003e\r\n\u003cli class=\"p1\"\u003eLow pass 12 dB\/octave\u003c\/li\u003e\r\n\u003cli class=\"p1\"\u003eHigh pass 12 dB\/octave\u003c\/li\u003e\r\n\u003cli class=\"p1\"\u003eBand pass 6 – 12 dB\/octave dependent on Q\u003c\/li\u003e\r\n\u003cli class=\"p1\"\u003eNotch with variable offset –\/+ 2 octaves\u003c\/li\u003e\r\n\u003cli class=\"p1\"\u003eInput with gain control\u003c\/li\u003e\r\n\u003cli class=\"p1\"\u003eInverted input with resonance dependent gain\u003c\/li\u003e\r\n\u003cli class=\"p1\"\u003eStrike input for pinging the filter\u003c\/li\u003e\r\n\u003cli class=\"p1\"\u003eFeedback switch which adds BP to the input for enhances resonance\u003c\/li\u003e\r\n\u003cli class=\"p1\"\u003eLimiter based on tanh wave shaper which affects primary input (post gain fader)\u003c\/li\u003e\r\n\u003c\/ul\u003e","brand":"INSTRUO","offers":[{"title":"Default Title","offer_id":41347424157869,"sku":"instruo_i-o47","price":369.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0606\/3449\/7197\/products\/io47.jpg?v=1645052343","url":"https:\/\/www.detroitmodular.live\/products\/instruo-i-o47","provider":"Detroit Modular","version":"1.0","type":"link"}