Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [current-signal]

16 questions
13
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4 answers

Implementing guard trace/ring in PCB design

I have read here and there some articles about pcb guard trace/ring. But none of them discussed how to correctly implent it. What I could find were some pictures and comparison that cant help me at the moment! What I would like to know is how can I…
Dumbo
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Is there a modern discrete component alternative to the JFET as preamplifier?

Please consider this schematic of an electret microphone capsule: (Source: Wikipedia) While considering something similar for signal conditioning of a 20 mVpp, 3k impedance output from a piezo bender, I found that discrete JFETs seem to have…
Anindo Ghosh
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4
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How do I sense sinusoidal voltage/current on a resistor?

I have an experimental circuit like below: My aim is to measure maximum or effective value the current on the load. The current sensor is a simple \$ 0.1 \Omega \$, \$5W\$ resistor. I filtered the voltage on the current sensor with the following…
hkBattousai
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CAN bus system causing me extra work!

I bought a car reversing sensor system... I bench tested it with a simple 12 V PSU, and it works great. Integrating it into my car is another matter since finding out that most cars since 2008 have CAN bus wiring. So a simple piggy back into the…
Alan
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2
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How can I "filter out" a small offset current from a current source?

I have a current source that produces a 1 kHz 1 mA sinusoidal current. Unfortunately it also outputs a small DC offset current (microamps). The current source does have a small trim pot to zero out the offset, but it is never perfect, and I need…
NeuralEngineer
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1 answer

Resistor selection

I need help on what resistor (if any) I need for this set up. 12v car power as signal power to DPDT relay switch. What do I need on the deadend side of relay signal?
Darren
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2
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3 answers

4-20mA Current Loops

Why was 4mA and 20mA picked? Was it an arbitrary choice? I don't see this signalling method used much in hobbyist projects, why's that? What are these current signalling loops best for?
cksa361
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How to convert low voltage digital signal (0-3.3V) to high power current signal 15-40W ranging from 1kHz to 1MHz?

I need to convert a digital signal generated from a microcontroller GPIO (0-3.3V) to a high-power (15-40W) current signal to drive an LED chip for illuminance, where the signal frequency can range from 1kHz to 1MHz. The goal is to utilize the…
hailstone
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Current Controlled Potentiometer

The core problem I am having is that I need to be able to control a DC to DC voltage regulator based on input from a 4 to 20 mA signal. The end goal is to have the output voltage of this regulator be able to dynamically change based on this input…
mckeevew
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AC current amplifier with pwm current control

I'm starting to build a piece of test equipment to test a trip device for switch gear breakers. I need to amplify an AC current source. When the breaker is in service the trip device receives its current sensing from the secondary of the ct on the…
TXROCKS
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2 answers

Audio - Current Graph

Mostly the signals out of a audio source is represented by Voltage/Time graph; like this - Then how would the Current/Time graph would look like, and what will happen if we alter it?
arjun
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Converting 1 - 5V signal to 4 - 20mA signal

reference: https://www.analog.com/media/en/technical-documentation/technical-articles/D61_EN-Convert.pdf I am trying to convert a 1-5V signal to a 4-20mA signal using this circuit but it was not successful, using the exact components mentioned in…
Karl
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(Inductor) Low-pass filter for current signal

I'm using resistors in a series circuit to vary the resistance between a constant 12V supply line and ground. Using transistors, the current either flow through all resistors, or is routed to ground after one of the resistors. This creates a…
towe
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Current sign when leave from battery and entering in resistor

I have to some confusion relate to basic fundamentals of current sign. Here is the simple circuit, with 30v, 1k resistor and current is 30mA. Whenever i have connected current prob to the battery positive terminal then in waveform current is shown…
Shashikant
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1 answer

Current Transducer with true RMS voltage output

Possible Duplicate: ICs that convert an AC signal into its true rms value Can anybody please recommend me a current transducer which has the provision of true RMS voltage output and instantaneous voltage output. The measuring range is 0 to +-160A…
george
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