{"product_id":"doepfer-a-171-4","title":"Doepfer - A-171-4","description":"\u003ctable data-mce-fragment=\"1\"\u003e \u003ctbody data-mce-fragment=\"1\"\u003e \u003ctr data-mce-fragment=\"1\"\u003e \u003ctd data-mce-fragment=\"1\"\u003e\u003c\/td\u003e \u003c\/tr\u003e \u003ctr data-mce-fragment=\"1\"\u003e \u003ctd data-mce-fragment=\"1\"\u003e\u003c\/td\u003e \u003c\/tr\u003e \u003ctr data-mce-fragment=\"1\"\u003e \u003ctd data-mce-fragment=\"1\"\u003eModule A-171-4 is a fourfold voltage controlled slew limiter. It's intended purpose is\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003epolyphonic portamento but can be used also for other applications where several slew limiters are required. The common slew time can be adjusted manually and in addition controlled by an external control voltage. The module\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003euses light-sensitive resistors (LDR). Therefore the slew times are not exactly the same for all units due to the tolerances of the LDRs and the LEDs, which are used to illuminate the LDRs. Inputs and outputs of the slew limiters are buffered to avoid voltage drops. This is especially important for polyphonic portamento applications. Each output can drive several VCOs without the need of exernal buffers. In addition the slew limiter inputs and outputs are available at internal pin headers for internal pre-wiring of polyphonic patches. As the switching contacts of the sockets are used for the internal pre-patching the internal patch can be overridden by using the sockets at the front panel. \u003cp data-mce-fragment=\"1\"\u003eThe module has these controls and in\/outputs available:\u003c\/p\u003e \u003cul data-mce-fragment=\"1\"\u003e \u003cli data-mce-fragment=\"1\"\u003eControl\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cspan data-mce-fragment=\"1\"\u003eMan. : \u003c\/span\u003emanual control of the slew limiter value (base value)\u003c\/li\u003e \u003cli data-mce-fragment=\"1\"\u003eControl CV: attenuator for the signal applied to the CV socket\u003c\/li\u003e \u003cli data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eSocket CV: control voltage input \u003c\/span\u003e\u003c\/li\u003e \u003cli data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eSockets In 1...4: slew limiter inputs\u003c\/span\u003e\u003c\/li\u003e \u003cli data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eSockets Out 1...4: slew limiter outputs\u003c\/span\u003e\u003c\/li\u003e \u003cli data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eLED: visual control of the slew limiter value (dark = long time, bright = short time)\u003c\/span\u003e\u003c\/li\u003e \u003c\/ul\u003e \u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eTechnical notes:\u003c\/span\u003e\u003c\/p\u003e \u003cul data-mce-fragment=\"1\"\u003e \u003cli data-mce-fragment=\"1\"\u003eEach light-sensitive resistor (LDR) forms together with an associated capacitor a simple standard RC network (\u003cstrong data-mce-fragment=\"1\"\u003eR\u003c\/strong\u003eesistor\/\u003cstrong data-mce-fragment=\"1\"\u003eC\u003c\/strong\u003eapacitor network). Input and output of each network are buffered.\u003c\/li\u003e \u003cli data-mce-fragment=\"1\"\u003eThe slew time range is about 5 ms ... 10 s (1:2000). Due\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003eto the tolerances of the LDRs and the LEDs\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003ethe slew times vary a bit for each unit. By changing the capacitor values this range can be altered: by lowering the capacitor values the slew limiters can be used as 6dB low pass filters. Increasing the capacitor values result in longer slew times.\u003c\/li\u003e \u003cli data-mce-fragment=\"1\"\u003eThe 4 photo resistors and LEDs are assembled within an small lighproof box. In addition the pc boards are made of lighproof black material to avoid interfering light from other modules or the bus board.\u003c\/li\u003e \u003cli data-mce-fragment=\"1\"\u003eOn the module pc boards two pin headers with 4 pins each are available. These are planned for the internal pre-patching of polyphonic modules: \u003cul data-mce-fragment=\"1\"\u003e \u003cli data-mce-fragment=\"1\"\u003eIn 1...4: The pins of this pin header are connected to the switching contacts of the sockets In 1...4. Hereby an internal four-wire connection to the CV outputs of the polyphonic midi-CV-interface\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003ca data-mce-fragment=\"1\" href=\"https:\/\/doepfer.de\/a1905.htm\" data-mce-href=\"https:\/\/doepfer.de\/a1905.htm\"\u003eA-190-5\u003c\/a\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003ecan be made. As long as the sockets In 1...4 are not used the internal connection to the A-190-5 is established.\u003c\/li\u003e \u003cli data-mce-fragment=\"1\"\u003eOut 1...4: The pins of this pin header are connected to the outputs Out 1...4. Hereby an internal four-wire connection to the CV inputs of the polyphonic VCO\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003ca data-mce-fragment=\"1\" href=\"https:\/\/doepfer.de\/A1114.htm\" data-mce-href=\"https:\/\/doepfer.de\/A1114.htm\"\u003eA-111-4\u003c\/a\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003ecan be realized. If more than one VCO has to be controlled by one output we offer so-called micro multiples.\u003c\/li\u003e \u003c\/ul\u003e \u003c\/li\u003e \u003c\/ul\u003e \u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e","brand":"Doepfer","offers":[{"title":"Default Title","offer_id":54725911740757,"sku":null,"price":57.34,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1071\/1872\/3413\/files\/A-171-4_frontal.jpg?v=1787442302","url":"https:\/\/climivor.myshopify.com\/products\/doepfer-a-171-4","provider":"CLIMIVOR","version":"1.0","type":"link"}