Comment by periblepsis on Electret microphone amplifier problem
@minghierid At the opamp output 1.4 V is the maximum swing. With loud sounds of \$60\:{\text{dB}_{\small{SPL}}}\$ as the limiting factor this suggests a maximum voltage gain of about \$7000\$, or an...
View ArticleComment by periblepsis on Intuition for voltage on a capacitor in series LC...
I think this is the answer that just gets straight to the heart of the right intuitive view. +1
View ArticleComment by periblepsis on preamplifier circuit for a piezo contact mic?
Galileo, The first thing that comes unbidden to mind about trying to use a piezo is designing its shape. If you make it into a cantilever of some kind, for example, then vibrations will generate...
View ArticleComment by periblepsis on STM32L4 GPIO Pin Electrical Model
They are telling you that there's about a 400 mV drop at 8 mA. So 50 Ohms. At higher currents that will likely go up a bit and the drop won't be entirely linear with sink/source current.
View ArticleComment by periblepsis on INA851 to amplify Wheatstone Bridge and transmit...
I believe you will need to write a lot more about the situation.
View ArticleComment by periblepsis on Nodal Analysis: Correct/Standard Method?
I provide a little explanation of the method I prefer here. It avoids having to keep track of signs, which is good because this means fewer chances for mistakes or confusion while writing out...
View ArticleComment by periblepsis on Need to understand this circuit
@AnkitKumar As DavidG25 indicates, if an ideal voltage source is applied directly to the two inputs of the opamp, then the output of the opamp will be its open loop voltage gain times that ideal...
View ArticleComment by periblepsis on What is the difference between loop transfer...
Nate, is there any reason why you can't just set H(s)=1 in your targeted diagram? Because, if so, the answer is obvious. So what's up?
View ArticleComment by periblepsis on Do we really need a resistor in series for the...
There are tiny protection diodes at each IO pin going to Vcc and Gnd. These typically cannot take more than a small current. So if the IO pin might be exposed to voltages higher than Vcc or lower than...
View ArticleComment by periblepsis on Why RF mixer is a current source?
C51 produces a current proportional to rate of change of voltage across it. That current is forced across R42. What else were you trying, earlier, that didn't work so well?
View ArticleComment by periblepsis on Nodal Analysis: Correct/Standard Method?
Setting a ground simplifies KCL equations (nodal analysis focused on the vertices of a graph.) KVL (mesh) also works and is focused on the edges of a graph. Tellegen's theorem relates these two...
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Answer by periblepsis for Nodal Analysis: Correct/Standard Method?
I tend to mix the sources that I study from, and I can not tell if anymethod is superior to the other/'healthier' to use in the long term,and I couldn't settle on any one yet. Does anyone have any...
View ArticleAnswer by periblepsis for Capacitor Self-resonant frequency
It could be a sharp point if the inductance is high. But the goal is to keep the inductance low. This means the inductance part of its impedance line is usually further out towards the higher frequency...
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Answer by periblepsis for Electret microphone amplifier problem
Shure discusses a power supply circuit "... designed to operate an electret condenser microphone." It may be a bit of over-kill, but you can see from this schematic that they are very serious about the...
View ArticleComment by periblepsis on Boundary condition for the normal components of the...
Draw some pictures, please. You may be a genius who can read text like you wrote and immediately visualize the entire scenario without any more context than this. But I'm not that good.
View ArticleComment by periblepsis on How Does Negative Differential Resistance Enable...
@Hafner Esaki wrote a paper in 1957, published early 1958, on a tunneling effect in germanium diodes. (I couldn't find Esaki's thesis paper.) The tunneling effect has prior history and avalanche...
View ArticleComment by periblepsis on Debugging/optimising a circuit
David, Have you included a yoke to your coil? I'd probably plan a 1" ID and 1.5" OD for the coil, and maybe 0.5" width. 200 to 300 turns of #24 magnet wire with an external steel yoke. That's assuming...
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Answer by periblepsis for What should be the collector current for Q1 in this...
Am I correct to assume Ie equals Ic as the beta is quite large here?Not unless you've been told to ignore it. And since \$\beta\$ has been specified as a finite value, that would be a clear indication...
View ArticleComment by periblepsis on Meaning of this step done for this self biased bjt...
Sayan, you have answers to prior questions. But you've not selected any of them. You also haven't communicated what problems remain in those answers that prevent you from selecting them. It would be...
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Answer by periblepsis for Meaning of this step done for this self biased bjt...
Start with the assumption that \$V_{\small{B}}=700\:\text{mV}\$Find \$I_{\small{C}}\approx 1.4482\:\text{mA}\$ and use this to find that the new \$V_{\small{B}}\approx 730.03\:\text{mV}\$Find...
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