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Posts by a concerned citizen‭

16 posts
75%
+4 −0
Q&A Flyback converter design

Try searching for "multiple outputs flyback". Basically, you can't control each, individually, instead you make the voltage feedback as the average between the outputs. Here's a quick'n'dirty test ...

posted 2y ago by a concerned citizen‭

Answer
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+4 −0
Q&A Duty cycle of buck-boost converter

If you're referring to this Wikipedia page then the topology has a negative output. In that case, the problem as you have it stated in the OP, is misleading: it should be Vo=-20. With that, extract...

posted 2y ago by a concerned citizen‭

Answer
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+4 −0
Q&A Deriving resistor values for a taper pad attenuator

Yeah, that looks like it's going to be messy. I agree with Olin: the problem starts with three variables and three conditions so, no matter how you look at it, you will end up with a system of...

posted 1y ago by a concerned citizen‭  ·  edited 1y ago by a concerned citizen‭

Answer
71%
+3 −0
Q&A Type II compensation network for a non-ideal transconductance amplifier

You can use various methods for it, one way would be to simply use the ideal transfer function and make it in parallel with $R_o$: $$\begin{align} A(s)&=R_{th}+\dfrac{1}{sC_{th}} \tag{1} \\ ...

posted 2y ago by a concerned citizen‭

Answer
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+3 −0
Q&A H(jω) does not exist for unstable systems, but we still use it when designing controllers - contradiction?

Please note that the text refers to the integral, or the mathematical evaluation through integration which, indeed, cannot be obtained. But that doesn't mean you can't obtain the Laplace transfer f...

posted 2y ago by a concerned citizen‭

Answer
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Q&A Unexpected impedance spike when paralleling capacitors

Around the 19 min mark in the video (approximately, found with hovering the cursor over the timeline) you'll see that different capacitors have different values of both capacitances and parasitics,...

posted 2y ago by a concerned citizen‭

Answer
66%
+2 −0
Q&A High pass filter design

I saw this link by accident and, while Andy's and Olin's answers are spot on, I thought I'd expand a bit on the complications they describe, just so you know what you're missing (or meeting, should...

posted 3y ago by a concerned citizen‭  ·  edited 3y ago by a concerned citizen‭

Answer
66%
+2 −0
Q&A Moving average that uses less memory?

I'm adding this as a corollary to Olin's post, in case an exact formula for attenuation is needed. That basic IIR is derived from the exponential moving average, and its impulse response is: $$h[n]...

posted 3y ago by a concerned citizen‭  ·  edited 3y ago by Mithrandir24601‭

Answer
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+2 −0
Q&A Meaning of some components around voltage reference in SMPS

R22, C22, C23, together with Rfbt (feedback top) and Rfbb (feedback bottom) form what is called a type II compensator, using TL431 as an opamp with built-in reference. The feedback network is a bit...

posted 3y ago by a concerned citizen‭  ·  edited 3y ago by a concerned citizen‭

Answer
66%
+2 −0
Q&A Critically damped oscillation issue

Your derivation is correct, you just missed the sign: $V_L=-V_C=2;\mathrm{V}$, because the capacitor charges with +2 V, and the discharge accounts for the negative sign on the inductor. The notatio...

posted 2y ago by a concerned citizen‭

Answer
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Q&A Effect of adding stages to a filter

It depends on whther the stages are buffered, or not. If they are buffered then it's more simple, because an RC lowpass has the transfer function: $$H_1(s)=\dfrac{\dfrac{1}{RC}}{s+\dfrac{1}{RC}}=\...

posted 1y ago by a concerned citizen‭  ·  edited 1y ago by a concerned citizen‭

Answer
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+2 −0
Q&A Modelling tunnel diode relaxation oscillator

Unless you know the exact formula for the I-V curve, you will never find out anything analytically. Fair warning: very unlikely you will get such formula, since they are strongly non-linear in natu...

posted 1y ago by a concerned citizen‭

Answer
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+2 −0
Q&A Results of analysis of Hartley oscillator dont make sense

If you are pursuing engineering then you can't use doodles instead of schematics generated by dedicated (or not) programs. It will take you just the same amount of time, if not less, and the result...

posted 1y ago by a concerned citizen‭  ·  edited 1y ago by a concerned citizen‭

Answer
60%
+1 −0
Q&A How to design a low-pass filter when certain conditions must be met

Your requirements are odd. Can you specify what purpose that filter is for? I'm saying this because, for a -0.1 dB/Hz, a filter will have a continuously increasing attenuation slope. Think of it li...

posted 1y ago by a concerned citizen‭

Answer
60%
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Q&A Complex frequency of a pole

This is mostly another view on @Olin's answer. For different input signals the frequency of the pole will have different values ,the pole as a pole exists for some specific values of L,C s but t...

posted 1y ago by a concerned citizen‭

Answer
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+1 −0
Q&A Design high -pass filter with 2 points of the bode plot

You still haven't said why you need, or even what order, type, etc. Assuming it's a 2nd order, an exact solution involves creating a generic transfer function and then solving a system of equations...

posted 1y ago by a concerned citizen‭

Answer