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Posts by Olin Lathrop‭

317 posts
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Q&A A signal with one mode or with three or more modes

with just one mode Others have already explained that "discrete" means a finite set of values, not just two. This is to point out that having just one "mode" (it seems you mean symbol) doesn't ma...

posted 2y ago by Olin Lathrop‭

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Q&A Band pass filter given cutoff frequency and bandwidth

I have decided to try design a band-pass filter with a cut-off frequency of 10kHz and bandwidth of 2 Hz. It's "10 kHz", not "10kHz". There needs to be a space between the number and the unit. ...

posted 1y ago by Olin Lathrop‭

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Q&A Complex frequency of a pole

Your question doesn't make a lot of sense. for a sinusoidal input signal s = jω the pole exists at the resonant frequency ωr. Actually the pole exists regardless of what the input signal is. The...

posted 1y ago by Olin Lathrop‭  ·  edited 1y ago by Olin Lathrop‭

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Q&A Effect of adding stages to a filter

There are a number of misconceptions here. bode plot db/Hz First, it's "dB", not "db". Second that's not a Bode plot. Those are dB/Log(Hz). In other words, a certain frequency ratio results in...

posted 1y ago by Olin Lathrop‭  ·  edited 1y ago by Olin Lathrop‭

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Meta Creating an "Insights" category

We have such low volume as it is, that I wouldn't want to see another category added at this time. It would only emphasize how little traffic there is. Let's not make the same mistake that Photog...

posted 2y ago by Olin Lathrop‭

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Q&A Via on pad: acceptable or not?

This can be OK if you consider and address the consequences carefully. It's something I would only do as a last resort. Usually I try to make sure the hole itself is outside the outline of the pa...

posted 2y ago by Olin Lathrop‭

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Meta Do we need tags for supply voltages?

I agree that "208VAC" and "230VAC" are too specific to be useful. I tried to edit the post to remove them. There is apparently a bug in the system. While I removed both tags from the post, one o...

posted 2y ago by Olin Lathrop‭  ·  edited 2y ago by Olin Lathrop‭

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Q&A Asynchronous connection question

How does the receiver understand the end bits? It doesn't. The purpose of stop bits (what you seem to be calling "end bits") is to leave a guaranteed gap before the next start bit. The leading e...

posted 2y ago by Olin Lathrop‭

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Meta React feature guidelines?

I think "dangerous" is pretty clear. It's when doing as recommended can cause significant damage to property or health. For example, recommending to a hobbyist to make a direct line-connected cap...

posted 2y ago by Olin Lathrop‭

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Q&A Most correct term for radio switching noise?

I don't think there is a formal term that means exactly what you describe. Switching transients generally means short term glitches that might cause noise, usually resulting from power being switc...

posted 2y ago by Olin Lathrop‭  ·  edited 2y ago by Olin Lathrop‭

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Q&A PTC resettable fuse leakage current

That's a marketing blurb. Look at the real datasheet. I just checked a polyfuse datasheet, and see that there is usually only about a 2.5 to 3.0 ratio of trip current to hold current. That shoul...

posted 2y ago by Olin Lathrop‭  ·  edited 2y ago by Olin Lathrop‭

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Q&A Change of pins in monostable multivibrator

The circuit you show doesn't make any sense: Start by examining the steady state condition. In steady state, C1 is effectively an open, so you ignore it. R4 keeps Q1 on. That means the collec...

posted 2y ago by Olin Lathrop‭

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Q&A Current and voltage of inductor

For reference, here is your circuit properly drawn with component designators: The question is what happens when the inductor current starts at 0, then the switch is closed. The first observati...

posted 2y ago by Olin Lathrop‭  ·  edited 2y ago by Olin Lathrop‭

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Q&A Flyback Converter - Output Ripple

Ripple doesn't need to be that high. I've done flyback supplies to power isolated sections quite a bit, using a pulse on demand scheme like yours. It's not hard to get the ripple down to ±50 mV. ...

posted 3y ago by Olin Lathrop‭  ·  edited 3y ago by Olin Lathrop‭

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Q&A Division of binary numbers logic circuit

I dont understand how to make a logic circuit which does that job:check if the divisors is greater and equal or less than the most left digits of the divident So think about it. Break it down int...

posted 2y ago by Olin Lathrop‭  ·  edited 2y ago by Olin Lathrop‭

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Q&A Diodes used in mixers

Take a look at the circuit and try to see what function it will perform on the input signals to yield the output signal. For simplicity, let's consider the diode ideal, R1 and R2 the same, and R3 ...

posted 2y ago by Olin Lathrop‭

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Q&A Trouble understanding how to use adjustable LDO regulator

I just happened to re-read this question, and I now think I see better what Microchip was trying to say here: On closer examination, I think this is actually correct but badly worded. I believe...

posted 2y ago by Olin Lathrop‭

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Q&A Voltage of tank circuit is invalid

You need to be more careful. First, you should have been able to see for yourself that the first equation isn't written right. I'll assume the whole "-0.5t" is the exponent of e. You were too sl...

posted 2y ago by Olin Lathrop‭  ·  edited 2y ago by Olin Lathrop‭

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Q&A Meaning of some components around voltage reference in SMPS

At first glance, R22, C22, and C23 look like a compensation network around the TL431. However, this doesn't make much sense because the TL431 is being run open loop. Rfbt and Rfbb divide down the...

posted 3y ago by Olin Lathrop‭

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Q&A Is there a way to reliably measure antenna return loss outside a lab?

It sounds like you are doing the measurements right. However, I expect the problem is in the space around the antenna. At 434 MHz, the wavelength is 690 mm or 27 inches. Everything out to about ...

posted 3y ago by Olin Lathrop‭

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Q&A Design considerations for a synchronous DC/DC converter

First, let's clarify something: replacing a diode with a MOSFET switch I have never seen the diode actually replaced. The intent is to have the FET on only when the diode would conduct, but no s...

posted 3y ago by Olin Lathrop‭

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Q&A Max V/Hz value for motor

Here is a copy of your specs to make them easier to discuss here: None of those specs really tell you what the V/Hz of the generator inside that motor is. We could take a reasonable guess at if...

posted 3y ago by Olin Lathrop‭  ·  edited 3y ago by Olin Lathrop‭

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Q&A My grid dip: how does this electron tube technology work?

The video helped explain a few things, but it's still not clear what the overall purpose of this device is. You showed it clearly producing a signal, but the documentation you quote talks about an...

posted 3y ago by Olin Lathrop‭  ·  edited 3y ago by Olin Lathrop‭

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Q&A Why does AC frequency affect my microwave's RPM?

The turntable is apparently run by a cheap synchronous motor. There is a type of motor that's easy to manufacture, that turns synchronously with the line frequency. You say the table used to rota...

posted 3y ago by Olin Lathrop‭

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Q&A Transformer - Vsec or Current rating parameter

In addition to what Andy said (+1), the 350 mA AC figure is probably limited by power dissipation, and therefore temperature. It applies during normal forward operation where the secondary current...

posted 3y ago by Olin Lathrop‭  ·  edited 3y ago by Olin Lathrop‭

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