{"product_id":"doepfer-a-149-1-quantized-stored-random-voltages-used","title":"DOEPFER A-149-1 QUANTIZED - STORED RANDOM VOLTAGES : USED","description":"\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eUsed module with very light rack rash, works perfectly, ships with M3 screws, and a power cable.\u003c\/span\u003e\u003c\/p\u003e\r\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eModule A-149-1 is the first module of the A-149-x range. In this group we present \u003cspan style=\"font-size: small;\"\u003eby popular request \u003c\/span\u003eseveral functions of Don Buchla's \"Source of Uncertainty 265\/266\" (SOU) modules that cannot be realized with existing A-100 modules. Many functions of Buchla's 265 and 266 SOU can be realized with existing A-100 modules. For details please refer to \u003ca href=\"http:\/\/www.doepfer.de\/a100_man\/a100_patch.htm\"\u003eA-100 patch examples\u003c\/a\u003e.\u003c\/span\u003e\u003c\/p\u003e\r\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eModule A-149-1 has available four different analog random control voltages that are generated in different ways.\u003c\/span\u003e\u003c\/p\u003e\r\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eThe \"\u003cem\u003eQuantized Random Voltages\u003c\/em\u003e\" section has available 2 CV outputs: \"\u003cem\u003eN+1 states\u003c\/em\u003e\" and \"\u003cem\u003e2\u003csup\u003eN\u003c\/sup\u003e states\u003c\/em\u003e\". N is an integer number in the range 1...6 that can be adjusted with the manual control (Man N) and an external control voltage CVN with attenuator. Whenever the rising edge of the input clock signal (Clk In) appears a new random voltage is generated at the N+1 resp. 2\u003csup\u003eN\u003c\/sup\u003e output. The N+1 output is capable to generate N+1 different voltage levels (or states), the 2\u003csup\u003eN\u003c\/sup\u003e output up to 2\u003csup\u003eN\u003c\/sup\u003e different states. If for example N is set to 4 the N+1 output generates up to 5, the 2\u003csup\u003eN\u003c\/sup\u003e output 16 different states. The voltage steps of the \u003c\/span\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003e 2\u003csup\u003eN\u003c\/sup\u003e output are adjusted to 1\/12 V in the factory. Consequently exact semitones can be obtained in combination with a VCO. \u003c\/span\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eThe voltage steps of the n+1 output are adjusted to 1.0 V in the factory corresponding to octave intervals in combination with a VCO. For each output a trimming potentiometer is available on the pc board that enables the user to select other voltage steps for the output in question.\u003c\/span\u003e\u003c\/p\u003e\r\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eEven the \"\u003cem\u003eStored Random Voltages\u003c\/em\u003e\" section has 2 stepped CV outputs available: one with \u003cem\u003eeven voltage distribution\u003c\/em\u003e of the max. 256 output states and second one with \u003cem\u003eadjustable voltage distribution probability\u003c\/em\u003e. The distribution probability is adjusted by a manual control (Man D) and an external control voltage CVD with attenuator. With the control set fully counterclockwise most of the random voltages will be low magnitude but even medium and high magnitude voltages may appear but with smaller probability. As the control is turned to the right (or a positive control voltage appears at the CVD input) the distribution moves through medium to high magnitude voltage probability. The symbol at the lower jack socket shows this coherence graphically. The voltage range is 0...+5V for both outputs of the \u003c\/span\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003e\"Stored Random Voltages\" section. For each output a trimming potentiometer is available on the pc board that enables the user to select another voltage range for the output in question.\u003c\/span\u003e\u003c\/p\u003e\r\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eThe A-149-1 can be extended by 8 random digital voltages with the \u003ca href=\"http:\/\/www.doepfer.de\/A1492.htm\"\u003eA-149-2 Digital Random Voltages\u003c\/a\u003e module.\u003c\/span\u003e\u003c\/p\u003e\r\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003e\u003cspan style=\"text-decoration: underline;\"\u003eTechnical details:\u003c\/span\u003e If you are interested in technical details here is some information. All random voltages are derived from digital pseudo random generators that work with shift registers and digital feedback via exor gates (the same principle as used in the Digital Noise module \u003ca href=\"http:\/\/www.doepfer.de\/a117.htm\"\u003eA-117\u003c\/a\u003e). The digital output voltages of the shift registers are added up with resistors to obtain variable stepped analog voltages. For the N+1 output all resistors have the same value, the 2\u003csup\u003eN \u003c\/sup\u003eoutput uses resistors in ratios of 1:2:4:8:16:32. Consequently the N+1 output has less different states available than the 2\u003csup\u003eN \u003c\/sup\u003eoutput. In addition the digital shift register outputs are gated dependent on the current N voltage (sum of manual control + external CV) by which the number of possible states can be reduced. In contrast to the \u003ca href=\"http:\/\/www.doepfer.de\/a117.htm\"\u003eA-117\u003c\/a\u003e the shift registers are not clocked by an internal oscillator but by the external clock input Clk In.\u003cbr\u003eThe generation of the \"Stored Random Voltages\" is similar but with different resistor values and more shift register outputs. In addition the random voltage is processed by a non-linear clipping unit with adjustable offset that allows to modify the distribution probability of the voltage levels appearing at the lower output.\u003cbr\u003eEven though the module is intended to generate slowly varying control voltages clock frequencies up to moderate audio range (about 2 kHz) can be processed.\u003c\/span\u003e\u003c\/p\u003e\r\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eA very detailed description of the functions of the random voltages and their application can be found in Allen Strange's excellent book \"Electronic music - systems, techniques and controls\" from page 82 (refer to \u003ca href=\"http:\/\/www.doepfer.de\/a100_man\/a100b_e.htm\"\u003eA-100 Further Reading)\u003c\/a\u003e.\u003c\/span\u003e\u003c\/p\u003e\r\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eFor more detailed information please look at the English user's manual: \u003c\/span\u003e\u003cspan style=\"color: #000000; font-family: Arial; font-size: small;\"\u003e\u003ca href=\"http:\/\/www.doepfer.de\/a100_man\/a1491_man.pdf\"\u003eA1491_man.pdf\u003c\/a\u003e\u003c\/span\u003e\u003c\/p\u003e\r\n\u003cp\u003e\u003cspan style=\"color: #000000; font-family: Arial; font-size: small;\"\u003e\u003cspan\u003eBreite\/Width: 12 TE \/ 12 HP \/ 60.6 mm\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eTiefe\/Depth: 60 mm (gemessen ab der Rückseite der Frontplatte \/ measured from the rear side of the front panel)\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eStrombedarf\/Current: 40 mA\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"DOEPFER","offers":[{"title":"Default Title","offer_id":41346947776685,"sku":"doepfer_a149-1_used","price":149.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0606\/3449\/7197\/products\/doepfer_a149_1_1.jpg?v=1645038417","url":"https:\/\/www.detroitmodular.com\/products\/doepfer-a-149-1-quantized-stored-random-voltages-used","provider":"Detroit Modular","version":"1.0","type":"link"}