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  • Miller feedback cap value? - diyAudio
    The Miller cap method creates a local feedback loop around the VAS transistor that results in a reduction of transimpedance with frequency, which is really useful for slowing the overall voltage resonse It is a very stable feedback loop because it only encompasses one transistor junction
  • Miller capacity and feedback | Audiokarma Home Audio Stereo Discussion . . .
    Two 12ax7 triodes with a feedback loop to make the EQ happen It was a thought that came out of a discussion about an early solid state one that had a very large loading cap at the input and I was wondering if maybe the big cap there was to simulate loading from a tube based stage
  • U87 and negative feedback - GroupDIY Audio Forum
    Here, a 470pf cap is placed in series between the capsule's front diaphragm and the FET's gate (I routinely remove it in the course of my U87 modifications- it does not contribute to anything audible or measurable; all it does is introduce phase shift at a crucial point in the circuitry
  • Negative Feedback Selector - Miller Audio
    Introducing our new Negative Feedback Selector (NFS) upgrade for Dyna-70 and Dyna-120 Amplifiers Questions such as: “What is Negative Feedback?” and “Why do I need a Negative Feedback Selector?” often follow
  • Purpose of the Feedback Loop Capacitor in the NFB - Amp Garage
    Assuming you are talking about a typical guitar amp with a LTP phase inverter, the feedback resistor, PI tail resistor (and or the presence pot, depending upon the circuit), and the presence cap form a low-pass filter, which reduces the feedback of high frequencies, as described above
  • Miller compensation - pros cons? - diyAudio
    Yes, there are several reasons First is that you only need phase compensation if you use feedback, most classic audio amplifier use limited feedback and open loop response is determined by the output transformer, using Miller compensation in such an amplifier would seriously limit the bandwidth
  • Help me understand this NFB schematic. | Rig-Talk
    It's just a NFB resistor switch Typically on Fortins and Camerons and Gowers and other hot-rodded builds, you've got a 470pF cap always in-circuit on the pot Then the switch ADDS (not subtracts) an additional resistor AND cap As it looks in this schematic, total NFB resistance is 133K, with 470pF + 4700pF depth caps (totaling 5,170pF)
  • Phase-lead compensation for uncompensated op-amps | GroupDIY Audio Forum
    After adding a 470pF cap into the feedback path, the closed loop gain falls to unity at about 30kHz, and at that point there is about 43 degrees of phase margin which looks to be pretty stable
  • Negative Feedback Selector (NFS) Kit Assembly . . . - Miller Audio LLC
    Loosen and dismount the Right and Left Speaker Terminal Strip (if Miller Audio Terminal Blocks were used, loosen, and dismount them) while leaving all Output Transformer wires attached to the Terminal Strip Terminal Block
  • Loud Noise due to NFB - diyAudio
    This might be caused by having the feedback wired in the wrong way In this case you wind up with feed-forward instead of feedback, resulting in oscillations Try to swap the connections to the output transformer secondary winding Kenneth





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