All Questions
Tagged with capacitive coupling
15 questions
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resistor placement in inverting amplifier to minimise noise coupling
(Image is my own creation.)
I notice that an inverting amplifier can be very sensitive to capacitive and inductive noise coupling on a PCB. I was wondering whether the placement of the R1 resistor ...
0
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2
answers
103
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LED on lamp outlet flashes when switch is off - is this capacitive coupling charging the power supply? And what to do about it? [closed]
I wanted to connect an LED light chain to a lamp outlet in my house in order to turn it on and off using the wall light switch. I have dismantled the 230V to 3V power supply that was built into the ...
1
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1
answer
72
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How is this LCD controlled?
Source: https://ozhealth.com.sg/product/genial-digital-thermometer-t15-orange/
I tore down a digital thermometer today (a Genial T15), and the interface to the LCD caught my eye: although there were ...
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256
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Why isn't capacitive coupling considered in EMC testing?
It seems like the emissions of interest in EMC testing are radiated and conducted emissions. Is this because capacitive coupling is so weak it doesn't pose a threat to other devices?
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162
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Where is the capacitive coupling in this adafruit soil moisture sensor?
Here is the moisture sensor:
https://learn.adafruit.com/adafruit-stemma-soil-sensor-i2c-capacitive-moisture-sensor/downloads
It has a large copper area insulated with soldermask that sticks in the ...
- 501
1
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1
answer
325
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What grounding should I use for this capacitively coupled input?
I'm designing a device that will receive and digitize analog video signals. In analog video, it's recommended to capacitively couple inputs. A typical input might look like this:
In this case the ...
- 251
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1
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83
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Capacitive coupling: how to collect 60uA from this set-up?
I need to collect at least 60uA via capacitive coupling between a high tension Cu cable with PVC insulation and a connector that is acting as the opposite face of the capacitor (can be a copper plate ...
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1
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3
answers
2k
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Shock from Capacitive Coupling
In an AC supply which is not earth grounded, I see a small amount of current flowing to ground from both wires of the supply (live wire has higher) even though the circuit is incomplete.
It is due ...
2
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1
answer
2k
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Marvell PHY to KS8999 PHY connection
I'm trying to design a custom board with Marvell 88E1111 PHY and I want to connect this board to another board with KS8999 PHY on it. I want to connect two phy sides with capacitive coupling.
The ...
- 33
0
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0
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222
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Peak value of sine wave for capacitively coupled inverting amplifier
I was working on question 2.23(a) and there is asked what input voltage is needed in order to ensure that the output does not clip. The clipping limits are +10 to -10 V.
I solved that, and, ...
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2
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2
answers
281
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Minimizing capacitive crosstalk in open collector quadrature speed sensor
I am integrating a speed sensor (Honeywell SNDH-T4L-G01) which comprises 4 lines: VDD, VSS, A, B. The last two signals provide speed and direction information in a quadrature format.
These are open ...
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1
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1k
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Capacitive Coupling Between Adjacent Conductors
I have been unable to find a definitive answer to my questions after some extensive browsing online.
My question involves the coupling between two adjacent conductors (wires, PCB traces, etc) due to ...
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-1
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2
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481
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Capacitive ECG electrodes and capacitor discharge
I am trying to make ecg electrodes with capacitive coupling. Since my capacitor is only about 10 pF at max and I have to have as low cut-off frequncy as possible, I came up with a circuit like this. ...
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6
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2
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842
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Electric shock from laptop due to capacitive coupling?
If a person touches an exposed wire (the wire has a ground-prong) on the 20V side of a power cable while barefoot, I heard that it is possible to receive a shock of higher than 20V due to capacitive ...
- 349
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231
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Calculating the voltage out of this particular cap coupled circuit
Before I get to my question, I'll just go over the input and output of the circuit from what I "know". The base of the BJT gets a 20 microsecond pulse that puts the bjt well into saturation and "VOUT" ...
