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Q&A Circuit for earth conductor presence detection

Reading a Tesla Wall Adapter installation manual , their brand of an AC EV charger, chapter about “Ground Assurance” and here is the quote from there: Although the equipment can work with L1 and...

2 answers  ·  posted 9mo ago by 2kind‭  ·  last activity 8mo ago by TonyStewart‭

Question tesla charging protective-earth
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Q&A LED driver with feedback through light. Which feedback topology is better?

Which topology is preferable? The one below because the LED driver is less likely to produce instability and, if it does, you can always tweak C4 (upwards) in order to kill-off the potentially...

posted 1y ago by Andy aka‭  ·  edited 1y ago by Andy aka‭

Answer
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Q&A Step voltage 750kV lines

Some gentlemen decided to throw a hook with wire over 750kV lines in Belarus. They survived, however, I find in interesting to find out why. Assuming the connection to Earth was solid, there would...

1 answer  ·  posted 1y ago by Elleanor Lopez‭  ·  last activity 1y ago by Olin Lathrop‭

Question high-voltage safety
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Q&A MOSFET drain current ringing in saturation region

It's got nothing to do with the MOSFET's miller capacitance. Miller capacitance causes problems in common-source circuits but, your circuit is common-drain (or source follower) hence, with a steady...

posted 1y ago by Andy aka‭  ·  edited 1y ago by Andy aka‭

Answer
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Q&A MAX485 transceivers breaking, Pi filter generating spikes?

What part of the absolute maximum ratings for the A and B data lines do you think would be protected by 33 volt TVS diodes: - If the chip is powered from a 5 volt supply then you use 5.6 volt TV...

posted 1y ago by Andy aka‭

Answer
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Q&A Regulated charge pump design

That circuit is drawn rather obfuscated, but it does seem to make sense: Start by looking only at D1, D2, C1, and C2. Pretend D3, C3, and D6 don't exist. Although not drawn very well, this is ...

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

Answer
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Q&A 1-wire interface overvoltage protection

I'm designing a robust 1-wire output for an IoT board. The interface should be able to withstand high voltage. Mainly the same voltage level as the board power supply. That's 12V to 36V DC. The p...

1 answer  ·  posted 1y ago by DeadMouse‭  ·  last activity 1y ago by Olin Lathrop‭

Question protection overvoltage 1-wire
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Q&A Choosing between common-drain JFET amplifier, and common-source

Do common-source JFET amplifiers have an advantage over common-drain? The JFET would be in a low noise photodiode amplifier. The signal is 100us pulses with 10us raise times. Here are the schema...

1 answer  ·  posted 1y ago by misk94555‭  ·  last activity 1y ago by Olin Lathrop‭

Question JFET photodiode
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Meta Should posting on Meta affect reputation?

Yes, votes on meta should not factor into rep. Meta downvotes indicate disagreement, not that you're a terrible person, have the IQ of a garden slug, and cast dispersions on your heritage like the...

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

Answer
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Meta Tag naming guidelines.

I've done a lot of work on tags lately and I'd like to share with the community some thoughts about the way tags should be named so that maybe it could become part of the FAQ and so hopefully lead ...

3 answers  ·  posted 1y ago by Lorenzo Donati‭  ·  last activity 1y ago by Lundin‭

Question discussion tags
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Meta How can we grow this community?

I just submitted a proposal to DuckDuckGo here for a new "bang" for their search syntax. If approved: !coddee search_term will trigger the following URL: https://electrical.codidact.com/posts/se...

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

Answer
71%
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Meta Apparent loss of reputation in last 24 hours

Posts on Meta no longer affect reputation, per this discussion with a moderator on this question.

posted 1y ago by Monica Cellio‭

Answer
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Q&A Cable voltage rating

I was looking for guidelines of how to select appropriate cables for applications (I am interested in DC), I found IEC 183 standard which talks about high voltage cable selection for AC. Also, the ...

1 answer  ·  posted 2y ago by Elleanor Lopez‭  ·  last activity 1y ago by Sclrx‭

Question voltage cable
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Q&A Sensing 3 states in a single mcu pin using firmware

Starting with your first circuit: It seems a little klunky, but should work. I don't like the D1 and D2 diodes. The reason I placed D1 is to avoid triggering the mosfet with very low voltage li...

posted 2y ago by Olin Lathrop‭

Answer
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Q&A Photodiode transimpedance amplifier with single supply

synopsis Achievable by using a rail-to-rail op-amp. A small bias on the non-inverting input improves the transient response of the op-amp. That’s the second circuit in the O.P. I use such top...

posted 4mo ago by Nick Alexeev‭  ·  edited 4mo ago by Nick Alexeev‭

Answer
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Q&A Thermal Relief – Yes or No?

In my PCB design, I have 0402 components connected to polygons. To reduce the risk of tombstoning, I connected them using thermal relief. My guiding principle is that if heat dissipation is not sy...

1 answer  ·  posted 2mo ago by Eyal78‭  ·  last activity 2mo ago by Olin Lathrop‭

Question pcb-layout thermal-relief manufacturing
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Q&A Thermal Relief – Yes or No?

The main point is that you need thermal symmetry between the two pads of a small package. You want the solder paste to melt at the same time between the two pads. Molten solder has significantly ...

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

Answer
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Q&A Power polygon and matching ground

For power polygon that primarily carry DC, how critical is it that it is located above a ground plane? If it is important, how crucial is it that the polygon completely overlaps the ground plane b...

2 answers  ·  posted 2mo ago by Eyal78‭  ·  last activity 2mo ago by Olin Lathrop‭

Question PCB pcb-layout ground-plane
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Q&A Power polygon and matching ground

If it is important, how crucial is it that the polygon completely overlaps the ground plane beneath it? A power polygon can hang off the side a of a power plane. Complete overlap isn't crucia...

posted 2mo ago by Nick Alexeev‭  ·  edited 2mo ago by Nick Alexeev‭

Answer
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Q&A Connector rated voltage vs IPC-2221B and IEC 62368

Rosenberger 23C25D-40ML5 specifies 500V RMS rating: Looking at the recommended landing pattern you can see that the distance between the signal landing pad and housing of the connector is 0....

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

Question safety voltage
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Q&A Do hobbyist slabtop Wi-Fi modifications need to consult FCC regulations?

During FCC (or any other EMC) testing, the manufacturer will use some antenna(s) and only those antennas will be the ones approved. If you modify the antenna or use one which wasn't used in the tes...

posted 8mo ago by Lundin‭  ·  edited 8mo ago by Lundin‭

Answer
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Q&A OPA2211 datasheet discrepancy

Looking at Texas Instruments opamp OPA2211it mentions GBW of 80MHz at a gain of 100, and 45MHz at gain of 1: Looking at the bandwidth graph from Figure 10 in datasheet: It looks like 80MHz is...

2 answers  ·  posted 5mo ago by Elleanor Lopez‭  ·  last activity 5mo ago by Nick Alexeev‭

Question datasheet opamp
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Q&A Why did the battery blow out?

Those batteries must be for powering electronics that receives commands from your controller or remote. They don't have anywhere near the energy to raise something like the headrest of a normal be...

posted 6mo ago by Olin Lathrop‭

Answer
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Q&A Does My Circuit Contain High-Speed Signals?

No, none of your signals sound like "high speed". However, that doesn't mean you should ignore high frequency noise issues. If you can dedicate one layer to be mostly a ground plane, that would b...

posted 2mo ago by Olin Lathrop‭

Answer
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Q&A Single-supply non-inverting op-amp with an output offset. How to create the output offset?

Your first circuit topology makes sense, although some of the part values are questionable. How the circuit works R37 provides the bias supply for the condenser microphone with a predictable impe...

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

Answer