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Q&A Summing op-amp 10 meters long

Yes, that should work. Each sensor is then dumping a current related to its measurement onto a single common wire. Basically, the sensor outputs are summed because currents add. 10 m shouldn't b...

posted 6mo ago by Olin Lathrop‭

Answer
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+1 −0
Q&A Signals and plane on the same layer

My answer from another place: - It's best to use a 4 layer board looking at the tracks you have on your ground-plane side. But, if you are really insistent on using only two layers (why?) then do...

posted 4mo ago by Andy aka‭  ·  edited 4mo ago by Andy aka‭

Answer
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+1 −0
Q&A Is Feeding a Watchdog Timer from an ISR a Bad Practice?

The problem with refreshing the watchdog from an ISR is that in case the main program hangs for whatever the reason, the ISR will keep living and could keep the watchdog alive, effectively blocking...

posted 6mo ago by Lundin‭  ·  edited 6mo ago by Lundin‭

Answer
60%
+1 −0
Q&A Is Feeding a Watchdog Timer from an ISR a Bad Practice?

Feeding the watchdog from an interrupt service routine is indeed a bad idea, usually. It depends on what you are really trying to protect against. The purpose of a hardware watchdog is usually to...

posted 6mo ago by Olin Lathrop‭

Answer
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+1 −0
Q&A Dual ratiometric power scaler design review and issues

Partial answer awaiting more specs Your question can't really be answered until we know how accurate the resulting solenoid drive levels need to be relative to the 0-10 V input signals, and how fa...

posted 5mo ago by Olin Lathrop‭  ·  edited 5mo ago by Olin Lathrop‭

Answer
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+1 −0
Meta Potential MathJax section in the formatting help

Yes, we should add how to use MathJax to the help for this site. Unfortunately, there are several things that work against getting this done: The Codidact help system sucks! When we first starte...

posted 5mo ago by Olin Lathrop‭

Answer
60%
+1 −0
Q&A Dual ratiometric power scaler design review and issues

I need to make a circuit board that has the following inputs and outputs: Inputs and outputs Inputs: $V_{\text{in1}}$ (0-10VDC) PLC controlled signal $V_{\text{in2}}$ (0-10VDC) PLC controll...

1 answer  ·  posted 5mo ago by sandwich1699975‭  ·  edited 5mo ago by sandwich1699975‭

Question PWM opamp voltage-divider
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+1 −0
Q&A Solder mask bridge issue

From what I understand, PCB manufacturing has a limitation on the minimum width of the solder resist—it cannot be too thin, typically not less than 5 mil. In many components, including those with a...

1 answer  ·  posted 5mo ago by Eyal78‭  ·  last activity 4mo ago by Olin Lathrop‭

Question PCB pcb-layout manufacturing
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Q&A Differential current signal to single-ended voltage conversion

The first thing I noticed is that all your circuits use separate resistors to convert the current of each side to a voltage. That will cause a differential mode error signal to the extent the resi...

posted 5mo ago by Olin Lathrop‭

Answer
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+1 −0
Q&A Controlling the shutdown pin of an IR Transceiver

When the switch is ON the transceiver will be active No, it's the other way around. First, you should be able to see the bar over SHDN in the datasheet. That means negative logic, where low is a...

posted 7mo ago by Olin Lathrop‭  ·  edited 7mo ago by Olin Lathrop‭

Answer
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+1 −0
Q&A Purpose of resistance between SENSE/FORCE line of power supply

I am reading through a multi-channel power supply manual and at some point it discusses the ability to chain channels in parallel to increase current output. In the schematic, there is one resisto...

3 answers  ·  posted 11mo ago by dekker‭  ·  last activity 11mo ago by TonyStewart‭

Question opamp power-amplifier
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+1 −0
Q&A Controlling the Low power mode of Buck Boost converter using a Microcontroller

Read the datasheet and do the math. On page 3 of the datasheet we find that the guaranteed high and low threshold voltages for the PS/SYNC input are 1.4 and 0.4 V, and its maximum input current is...

posted 7mo ago by Olin Lathrop‭

Answer
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+1 −0
Q&A Controlling the Low power mode of Buck Boost converter using a Microcontroller

I am using TPS63000 in my design and I need to control PS/SYNC pin using a micro-controller. **The input to the buck boost converter is 3V to 4.3V which is coming from a battery. The microcontrol...

1 answer  ·  posted 7mo ago by newbie‭  ·  edited 7mo ago by newbie‭

Question microcontroller Analog BJT buck-boost-converter
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+1 −0
Q&A OPA2211 datasheet discrepancy

The 1st page of a datasheet is written by marketing. It can still give you an idea of what the chip is about, but it often contains the performance data under the best conditions. The conditions ...

posted 8mo ago by Nick Alexeev‭  ·  edited 7mo ago by Nick Alexeev‭

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

I see that Nick has already provided a good answer to R5, so I'll only address this: Furthermore, an amplifier symbol called "gm" is labeled as transconductor. What does it do? What you show is a...

posted 11mo ago by Olin Lathrop‭

Answer
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Q&A Synchronous FIFO design code review

As a personal project, I have designed a synchronous FIFO in Verilog HDL. But while testing with a testbench, I observed that the FIFO values are flushed out after one clock cycle when read-enable ...

1 answer  ·  posted 11mo ago by aditya98‭  ·  last activity 6mo ago by EsotericaEnthusiast‭

Question FIFO Verilog
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+1 −0
Q&A Do hobbyist slabtop Wi-Fi modifications need to consult FCC regulations?

is it possible that moving around laptop antennas does not change the specifications drastically, because, for example, the antennas are low-power The radiated power is probably not low compared t...

posted 10mo ago by Olin Lathrop‭

Answer
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Q&A What is connector pitch and how to measure it?

When posting identification or general questions related to connectors, integrated circuits or other parts with pins/legs, engineers always speak about something called pitch. What is the meaning ...

1 answer  ·  posted 10mo ago by Lundin‭  ·  last activity 10mo ago by Lundin‭

Question identification connector pitch
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+1 −0
Q&A Issue in Cable Sizing and control cable selection

200 HP is 147.1 kW. At 480 V, it takes 306 A to transfer that much power. You didn't say, but your 480 V power feed is probably three-phase, and the motor is three-phase too. I don't remember ho...

posted 9mo ago by Olin Lathrop‭

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

is there a technical reason that prohibits such cable from working? Two reasons: Signal integrity Data integrity Signal integrity is reason #1. Basically, cables are not "transparent"...

posted 9mo ago by absurdus‭

Answer
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Q&A Which transistor type to use for charge shuttle, as part of an active charging circuit?

I've figure probably not an IGBT since their gate requires too much current, while a BJT would be too wasteful as well, so would that mean a MOSFET or JFET is the best choice? First, let's cla...

posted 9mo ago by absurdus‭

Answer
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+1 −0
Q&A Which transistor type to use for charge shuttle, as part of an active charging circuit?

You need something with very low on-state voltage drop. That effectively means some type of FET. Those look resistive when on, as opposed to a voltage source like a BJT does. You need to look ca...

posted 9mo ago by Olin Lathrop‭

Answer
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Q&A What type of button is this on a remote control

It is interesting to see how they deposited these carbon electrodes over solder mask and copper traces both under the button foil switches and membrane switches alike which offer more tactile feel....

posted 1y ago by TonyStewart‭  ·  edited 1y ago by TonyStewart‭

Answer
60%
+4 −2
Q&A estimation of pogo pin resistance

Is there a scientific way to estimate the resistance of a pogo pin? If it was a solid cylinder or wire one could calculate the resistance: R = ρ × L / A But a pogo pin is hollow inside, the sp...

2 answers  ·  posted 1y ago by dekker‭  ·  last activity 1y ago by TonyStewart‭

Question resistance
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+1 −0
Q&A Level shifting of a 3 state logic pin

Another solution which uses an ADC to read the three-state pin on the battery charger IC. The original question mentions GPIO, and doesn’t mention ADC. Maybe this will be useful for some other de...

posted 1y ago by Nick Alexeev‭

Answer