Questions tagged [current-signal]

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64 views

(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 ...
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0answers
31 views

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 ...
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2answers
79 views

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 ...
2
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3answers
94 views

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 ...
1
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0answers
200 views

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 ...
1
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2answers
282 views

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?
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4answers
1k views

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 ...
3
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2answers
4k views

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 ...
4
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2answers
2k views

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 ...
0
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1answer
845 views

Current Transducer with true RMS voltage output [duplicate]

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 ...
11
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4answers
24k views

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 ...
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1answer
595 views

PIC to measure Pressure sensor “MBS 1200”

I have a pressure sensor MBS 1200. I want to connect the same to a PIC micro controller for an application. Can you please suggest a circuit to do the same. I am not familiar with current output ...
2
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1answer
135 views

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?
2
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3answers
756 views

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?