![]() This does not cause a problem if the OAs wish to drive their outputs higher than V_Sense, but I'm having trouble convincing myself that OA1 will accurately/instantaneously decrease it's output voltage in response to a stimulus seeing as it's ground terminal is at V_Sense. So if it were to be a 5V regulator, Vcc, measured relative to the true ground, will oscillate with a voltage of (V_Sense + 5V). In the schematic shown below, the linear regulator is also referenced by V_Sense. So for a V_Signal < 1V, at best, OA2's output will be driven to ~1V, shutting off the NPN, but a voltage < 1V cannot be produced at V_Sense. But correct me if I'm wrong, this also sets a lower limit on the allowable signal voltage span since the Q-current, being roughly ~10mA, will produce 1V across the sense resistor of 100 Ohms at all times. The OAs are grounded at the feedback terminal (V_Sense) such that their Q-current is compensated for by the VCCS. Let me rephrase what I said in my previous post. I see what you mean and I'll look into the Linear Regulator as a solution. You'll need to use something with a standard pass-transistor topology. ![]() Those *require* an input cap for stabilization, I believe. *And* you cannot use a low-dropout regulator. If you need to filter the input voltage to the reference, then you are going to have to regulate first. And, assuming the servo can keep up, will cause the cap to appear non-existent. Inside the servo, Q1 will will provide the charge/discharge currents, but that will cause large voltage swings and excessive power dissipation. If the cap is outside the servo, the loop will have to provide the current causing the high freq attenuation you are seeing. Something is going to have to deliver the A/C current through that cap. Think of it this way: Your rail voltage is going to vary up to +/- 2V at the frequency of the signal source. 2BUS SIGNAL PATH PROWith its pro features, flexible software, and abundant I/O, the Quantum 2 joins the original Quantum as PreSonus’ most powerful combination audio interfaces/studio command centers and fits into any recording and production environment.Thinking some more about this on my drive home from the office:Ĭ1, that 20uF cap, is going to kill you no matter what you try to do - unless you stabilize it's voltage. To top it off, Quantum 2 owners get the Studio Magic plug-in suite free. ![]() 2BUS SIGNAL PATH FREEMost of the Quantum 2’s features can also be controlled in PreSonus’ free UC Surface control software, so even if you use third-party recording software, you can remotely access the features. 2BUS SIGNAL PATH FULLLaunch the included PreSonus Studio One® Artist DAW, and you’ll find full preamp control functions integrated into your recording environment. With the Quantum 2, your audio interface is an integrated extension of your recording environment. BNC word clock I/O ensures your Quantum 2 and other digital audio devices operate in tight sync. With ADAT Optical I/O and S/PDIF stereo digital I/O, you can have up to 18 additional digital inputs and outputs for a total of 22 in and 24 out. ![]() You also get four ¼-inch TRS line outputs, and a headphone output with dedicated volume control. You get sixteen channels of pristine analog summing, dual stereo outputs to feed both your monitoring chain and your mix path, and an expansion port to link any. The Quantum 2 offers two combo mic/instrument inputs and two combo mic/line inputs, each with a digitally controlled XMAX preamp and +48V phantom power. ![]()
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