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1answer
44 views
Frequency and magnitude of power variations in a DC circuit.
I have a 5 V 5 A power source which is connected to a simple development board with a processor that draw current dependent on utilization. I use a multimeter that measure 1000 samples / s to measure ...
2
votes
2answers
119 views
How does a real current source change its pd to keep constant current
An ideal current source is able to change its potential difference at the output to keep the same current at the output regardless of the load imepedance there. Real current sources are able to do ...
1
vote
1answer
52 views
Saturating a BJT with an open load
Is there some drawback in having a BJT transistor saturating without a load?
The scenario is this: BJT is driving a relay, but there is a switch to have the relay always on or off leaving the BJT ...
1
vote
1answer
75 views
What's the input resistance of an opto-isolator?
I need to sense if a 48 volt power supply is supplying voltage or not, I plan on doing this with a opto-isolator and I am happy with the output circuit from isolator.
Can I connect the input of the ...
-2
votes
2answers
121 views
What amplifier circuit to use for a wheatstone bridge force transducer [closed]
I would like to amplify the signal from a force transducer which can measure load from 0-1500g. The object i am using is less than 1 gram. I would need an operational amplifier. I would like to know ...
0
votes
1answer
63 views
Drawing VTC from IV
So I am given the IV characteristic plot along with the resistive load circuit which looks like:
The load is a 25k resistor. I want to understand how to actually do the problem which is why i didn't ...
0
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2answers
449 views
How to interface a digital scale strain gauge weight sensor with a microcontroller? [duplicate]
Possible Duplicate:
How to interface a digital scale strain gauge weight sensor with a microcontroller
How to interface a digital scale strain gauge weight sensor with a microcontroller?
It ...
1
vote
2answers
197 views
How to switch both AC and DC voltage to a load
I have a load, an electrode basically acting as a very tiny capacitance, that I want to supply a voltage or bring to ground. The voltage can be either DC, up to about mains voltage, or AC into low KHz ...
1
vote
1answer
178 views
charging battery while under load
my question applies to NiCd/NiMh battery types.
Can I simultaneously charge & discharge the battery? Might it cause any harm to it?
I presume there will be opposite movements of the charged ...
2
votes
1answer
136 views
Boost converter can't power load. What are the limitations?
I'm trying to power a nixie lamp with a 9 volt battery. The boost converter charges up to 160vdc, the nixie lights, but quickly goes out (or half lights) as it pulls more current ~= 5mA. My boost ...
4
votes
2answers
160 views
Voltage regulator misbehaves under certain conditions
Okay guys, this one has me baffled. Take these two circuits:
Typical stuff; Power in goes to the + rail, GND to the - rail. This is a 19V power supply going in. It goes through the voltage ...
0
votes
2answers
192 views
Simulate Headphone Load
I'm working on a low power (portable) audio mixing console, fed by audio signals from MP3-Players and mobile phones.
There should be an option to monitor the sound, but as soon as I route one sound ...
1
vote
1answer
256 views
LT3080 regulator question
The datasheet of the LT3080 voltage regulator says that "For true zero voltage output operation, this 1mA load current must be returned to a negative supply voltage."
What exactly does this mean? How ...
5
votes
3answers
1k views
Help needed optimising simple current limiting circuit
I have been experimenting with simulating current limiting circuits. I am trying to limit current to ~500mA given a fixed 4.8V source. I have started using a circuit like the one found on this ...
9
votes
2answers
3k views
Constant current, constant power and constant impedance loads
Ive been looking for information on constant power, constant current and constant impedance/resistance loads, there's some information about the constant current loads, but very little that really ...
