Czym zajmuje się KAMIENIARSTWO ?
Temat: Module MF et potentiometre motorisÄĹ Alps
VCA signifie " voltage controlled amplifier", c est un amplificateur controlÄĹ par une tension. en gÄĹ nÄĹ ral c est un petit circuit reposant sur un AOP (ampli operationnel) qui dispose d'une entrÄĹ e pour le signal, d'une sortie pour le signal et d'une entrÄĹ e ÄÂ laquelle tu appliques une tension qui va dÄĹ terminer le coÄĹ fficient d'amplification. il risque d'ÄĹźtre assez dur de calibrer avec prÄĹ cision pour que deux...
Źródło: midibox.org/forums/index.php?showtopic=7127
Temat: Motorfaders?
Basta, some motorfaders have an extra resistor track for use on automated analogue mixing consoles, where the resistor forms part of the signal path. But this creates the problem where the electrical noise from the motor gets into the signal. That's why VCA's are usually used, where a control voltage is referenced from the slider position, which contols the Voltage Controlled Amplifier for that slider. I think this is how the automation system knows the position of the fader too. cos on some consoles you can turn the VCA's on and off. well at least I think I know what I'm talking about, someone correct me if I'm wrong! bye from Steve ;D
Źródło: midibox.org/forums/index.php?showtopic=445
Temat: Some SID questions
Hi Benedict, the modules are correct, and for the power supply circuit I would suggest the original C64 PSU, a schematic can be found at the MBHP_SID page. The audio outputs of my SID modules are directly connected to the soundcard (Hammerfall DSP Multiface) which gives me the freedom to apply different effects to the channels and to mixdown them seperatly. For other usecases I cannot provide schematics, but I guess that good working VCA ( voltage controlled amplifier) and mixing circuits can be found somewhere in the web. Controlling pan: thats possible if you add a MBHP_AOUT modules, which gives you 8 analog (CV) outputs. They are part of the modulation matrix, so you cannot only control them with all 6 LFOs, but also with the 2 envelope generators. One of the CV output can control two VCAs which balance the output between two audio channels. Schematics -> search in the web 12 part polyphony:...
Źródło: midibox.org/forums/index.php?showtopic=3326
Temat: MOOG VOYAGER
...powierzchnie dotykową, pełną implementację MIDI In i MIDI Out, oraz całą masę udogodnień i nowoczesnych rozwiązań technologicznych, przez co charakteryzuje się niespotykaną stabilnością i niezawodnością. Sygnał rozpoczyna swoją drogę w module trzech oscylatorów VCO, generatora szumów oraz przedwzmacniacza zewnętrznego sygnału audio. Sygnał ten modyfikowany jest przez dwa filtry, tak charakterystyczne dla Mooga oraz jeden VCA ( Voltage Controlled Amplifier). Źródłem modulacji są dwa generatory obwiedni ADSR (Attack Decay Sustain Release) i jeden LFO (Low Frequency Oscillator). Instrument posiada dynamiczną klawiaturę, wyposażoną w 44 dynamiczne klawisze z afterpressure, regulatory pitch bend i modulation wheel, trójwymiarową powierzchnię dotykową oraz całą gamę wejść jack control/pedal. Również w zakresie konstrukcji mechanicznej i wzornictwa...
Źródło: clubworld.pl/viewtopic.php?t=2245
Temat: Guitar-like midi synth controller
...SUB-COMMANDER Guitar Synthesizer Available as a PCB from Ray Wilson's Music From Outer Space ... but there's plenty of info there if you wanted to build your own ;D Introduction /By the time you complete this project you will have built: A guitar sub-octave generator A guitar to gate & trigger generator An audio mixer. Two AD/AR generators. Two Triangle wave LFOs. A 12dB/octave lowpass VCF (Voltage Controlled Filter) A exponential response VCA ( Voltage Controlled Amplifier)
Źródło: midibox.org/forums/index.php?showtopic=9105
Temat: midification of an analog filter
my fiirst pcb is arrived , and i need an advise to add the "Another Dual Voltage Controlled Amplifier" , but i don't see how i must do to keep the control pot with the vca circuit : if i put the VCA after the pot ,i will be obliged to "open" fully the pot ,and if i put the VCA before ,my pot will work with the signal still driven by the VCA. i see there is pot on the VCA module build on the page http://www.musicfrom...newdualvca.html ,so where have I to connect them?
Źródło: midibox.org/forums/index.php?showtopic=4029
Temat: Module MF et potentiometre motorisÄĹ Alps
VCA = Voltage Controlled Amplifier, en gros un amplificateur dont le gain est controllÄĹ par une tension. Il y aussi les PGA (Programmable Gain Control), qui sont peut etre plus simple d'utilisation (il se commande directement avec un signal numÄĹ rique, grosso modo une valeur pour dÄĹ finir le gain), et reste de bonne qualitÄĹ (meme si je dirais pas que c'est aussi bon qu'avec un potentiomĨtre...) Sinon le module MF n'est peut etre pas...
Źródło: midibox.org/forums/index.php?showtopic=7127
Temat: Szukam/kupie SJ3358 S7700
...volume IC for 6.1-channel BD3813KS/BD3815KS : http://pdf1.alldatasheet.com/datasheet-pdf/view/83810/ROHM/BD3815KS.html 6-Channel, Serial Input Master/Balance Volume Controls SSM2160 : http://www.analog.com/static/imported-files/data_sheets/SSM2160.pdf Six-Channel Single-Chip Electronic Volume Control System LC75347E : http://www.datasheet4u.com/html/L/C/7/LC75347E_SanyoElectric.pdf.html Low Cost Quad Voltage Controlled Amplifier SSM2164 (1 i 172 sztuki) http://datasheet.digchip.com/041/041-06380-1-SSM2164.pdf i inne...... H.
Źródło: elektroda.pl/rtvforum/topic1373015.html
Temat: midification of an analog filter
...frequency with a midi CC/controller and gate (trigger) the filters envelope generator with midi note on/off messages. If you want resonance under control of cv and thus midi, i've seen this trick but i dunno for sure this works with each VCF. resonance is mostly some kind of feedback path of the amp part of a filter (more experienced people are welcome to correct me here), more feedback>more resonance. if you want to control this you can "insert" a VCA ( voltage controlled amplifier) instead of the pot in the feedbackpath. With the vca you now can control the amount of feedback by cv thus by midi! @@rumblack; you can also use OTA's as voltage controlled replacements for pots, but i haven't studied it enough to really undersand how it works and how to use it. The datasheet of LM13700 OTA http://www.national....LM/LM13700.htmlhas some examples of voltage controlled resistors; maybe someone can shed a...
Źródło: midibox.org/forums/index.php?showtopic=4029
Temat: Juno 60 MIDIfication
hi, CV means Control Voltage VCF means Voltage Controlled Filter (so the VCF input is a CV input that drive the filter frequency) VCO means VCA means Voltage Controlled Amplifier, so a VCA is a circuit with one input for your audio signal (and one output, of course) and another input on which you can apply a voltage to drive the amount of gain that will be applied to your audio signal Can I play notes from the sequencer connected to VCF control imput of juno no, Gate signal are simple pulse, CV are continuous voltage.. a MIDI to CV converter simply transform the digital signal comin from an MIDI device into an analog...
Źródło: midibox.org/forums/index.php?showtopic=7849
