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Q&A Flyback transformer with Intrinsic Safety

I think you are over complicating your thinking a little bit. For an associated device the only thing that matters is how you limit the energy going into the hazardous area. You put your zener barr...

posted 2y ago by MathieuJohnson‭

Answer
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+3 −3
Q&A Deriving resistor values for a taper pad attenuator

I'm thinking out loud here and haven't solved this yet. This answer is logging my process as I try to solve the problem. It may very well result in the same long-winded process you went thru. No...

posted 2y ago by Olin Lathrop‭

Answer
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Q&A Complex frequency of a pole

If we have the transfer function of a LC high pass filter: $H(s) = \frac{sL}{sL+\frac{1}{sC}}$ If we want to find the pole of that filter in the end we get: $s = \frac{j}{\sqrt{LC}}$ and for a ...

3 answers  ·  posted 2y ago by MissMulan‭  ·  edited 1y ago by Lorenzo Donati‭

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Q&A Finding voltage gain of Hartley oscillator

I am trying to find the AC analysis of a BJT Hartley oscillator but I cannot continue. How do I find the voltage gain? When no feedback is there, we just find the output resistance and the current...

1 answer  ·  posted 2y ago by MissMulan‭  ·  edited 2y ago by MissMulan‭

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Meta Easy way to convert over long comment into an answer

Easy way to convert over long comment into an answer. It would be great if while typing a quick comment to a question you realise that you are about to exceed the character count and it is a valid...

0 answers  ·  posted 3y ago by KalleMP‭

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Q&A How do PLCs normally measure 4-20mA current loops?

you want a current source start with a linear regulkator like LM340 and use the relays to switch in different load resistors.

posted 2y ago by Jasen‭

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Q&A Mysterious little cases hanging on street wirings in India

CATV distribution is typically half-inch rigid coax, so it's not that. It looks more like a fibre junction box "aerial fibre terminal" in the parlance.

posted 2y ago by Jasen‭

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Q&A Find Q point in common base BJT configuration

Load line Formal "explanation" In common emitter collector we just draw a line from the vertical axis (Ic) at the point (0,VCC/RC) to the horizontal axis at the point(VCC,0) and where that line...

posted 3y ago by Circuit fantasist‭  ·  edited 3y ago by Circuit fantasist‭

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Meta How about a `basic-circuit-block` tag?

I'm in the process of giving the tags page some structure, writing tag descriptions and creating synonyms and some hierarchy. I'd like to know the Community stance on a new tag I'd like to add: b...

0 answers  ·  posted 1y ago by Lorenzo Donati‭

Question discussion tags
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Q&A Confusion about channel capacity definition and units

Why can the channel capacity C of the additive white gaussion noise (AWGN) channel be denoted in different ways and how do they relate to each other? Examples: C = (1/2) * log2(1 + SNR) [bit?] ...

0 answers  ·  posted 1y ago by daniel_s‭  ·  reopened 1y ago by Olin Lathrop‭

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Q&A Why 3.3V instead of 3V?

The other answers are excellent justification to the the industry standards imposed on CMOS logic. The historical migration to smaller lithography CMOS led to lower Cds values which led to faster ...

posted 1y ago by TonyStewart‭

Answer
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Meta Tag naming guidelines.

Adding to what Lundin said (+1): s is seconds, S is siemens (1/Ω). What we write here is inherently HTML. Greek characters like µ and Ω are defined as HTML entities, and can always be writte...

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

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Q&A Power switches and automotive load dump, unclamped

The spec 79V 0.5 ohm 5ms = 62.41 Joules . The TVS must be rated for a low temp. rise at this energy dump or higher. MOV's are limited by the number of discharges as the oxide wears out, but may be...

posted 1y ago by TonyStewart‭

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Meta Tags about quantities: should we have them?

I've noticed there are a lot of tags referring to general physical quantities (e.g. current, voltage, frequency) I'm not sure if they are useful. For example, what usage would have the tag voltage...

1 answer  ·  posted 1y ago by Lorenzo Donati‭  ·  last activity 1y ago by Lundin‭

Question discussion tags
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Q&A Does My Circuit Contain High-Speed Signals?

If there are high slew rate signals or high-impedance circuits, layout matters. Otherwise, it usually doesn’t. Slew Rate (SR) in the time domain translates to bandwidth in the frequency domain, so...

posted 2mo ago by TonyStewart‭

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Q&A Circuit for earth conductor presence detection

Fault Codes (Page 38) PE ground is mandatory to be functional and is tested. Typical standards expect < 25 Ohms for residential zones. RCD's and similar testers use as test resistor to forc...

posted 8mo ago by TonyStewart‭

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Q&A Purpose of resistance between SENSE/FORCE line of power supply

This looks like the block diagram was done by a technical writer, not the designer. It is someone's conceptual misunderstanding of a linear servo with feedback relays and optional FET drivers with...

posted 8mo ago by TonyStewart‭  ·  edited 8mo ago by TonyStewart‭

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Q&A Issue in Cable Sizing and control cable selection

Hi All, I have a query regarding the cable sizing and motor starting. I have a 200HP motor to feed Low voltage power @480V. The distance between the substation and the motor is 2000m. Voltage dro...

1 answer  ·  posted 7mo ago by AKKIIK‭  ·  last activity 7mo ago by Olin Lathrop‭

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Q&A Analysis of LC circuit using intuition

This problem investigates the behavior of the voltage across the capacitor in response to a step input: - I am asked to find the voltage Vc(t) without the use of differential equations or simula...

2 answers  ·  posted 7mo ago by Carl‭  ·  last activity 6mo ago by Olin Lathrop‭

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Q&A Analysis of LC circuit using intuition

without the use of differential equations or simulation Then use Laplace transforms to derive the transfer function. Multiply it by 1/s to get the Laplace result when a step is applied then, u...

posted 7mo ago by Andy aka‭  ·  edited 7mo ago by Andy aka‭

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Q&A Is it possible to build a passive many hosts to a single disk SATA splitter?

I don't find any of such cables, and the discussions on the web revolve around SATA being point-to-point and not designed for networked or shared storage. However, if one'd build a cable that is j...

1 answer  ·  posted 7mo ago by mavavilj‭  ·  last activity 6mo ago by absurdus‭

Question SATA
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Q&A Opto-coupler, slow turn off

Some optos are really slow. What off time is yours specified for? Your circuit could be better. The transistor is turned on thru 1 kΩ, but off thru 11 kΩ. You are also giving it way more base c...

posted 6mo ago by Olin Lathrop‭

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Q&A Opto-coupler, slow turn off

I changed value of resistor R318 from 10 kΩ to 1 kΩ, and that alone significantly improved off-time. From 200 μs to around 25 μs. That is much better. So I looked into datasheet again. I found t...

posted 6mo ago by Juraj Lonc‭

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Q&A How does JFET biasing work in a 2-terminal electret condenser microphone?

The voltages from the raw microphone are quite small and fairly high impedance. That's why an amplifier at the mic is needed in the first place. The signal on the wire would be way too small comp...

posted 5mo ago by Olin Lathrop‭

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Q&A Synchronous FIFO design code review

Your current FIFO acts as a standard FIFO. What you desire is a First Word Fall Through (FWFT) FIFO or a showahead FIFO. Changing the rd_data to be combinational logic instead of registered logic i...

posted 4mo ago by EsotericaEnthusiast‭

Answer