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/sci/ - Science & Math

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File: 4 KB, 338x203, input output.png [View same] [iqdb] [saucenao] [google]
6382959 No.6382959[DELETED]  [Reply] [Original]

With a circuit diagram like pic related, when I put this into some modelling software how do I do the input and output parts.

I'm under the assumption I put a voltage source across the input, with the positive at the top of the arrow, but how do I handle output?

That or am I supposed to link the inputs and outputs together, and then link those?

Thanks, I'm using the MIT circuit sandbox for modelling.

>> No.6382969

Self bump

>> No.6382980

Connect an impedance across the output (hopefully mimicking the impedance of the device you'd connect) and measure the current flow through it. If your load has variable impedance, this is harder (you'll need to model it as part of your circuit), but if it's something relatively simple like a stereo speaker, it'll work.

>> No.6382997

>>6382980
I'm terrible at electronics, you mean putting a resistor across the outputs (that is decently less than 1k ohms I assume).

The source in this is a 1 kHz, 10 V pk-pk square wave.

>> No.6383004

Not sure for circuit sandbox, but for something like ltspice you'd set your voltage source equal to some variable, then set up a voltage or frequency sweep, and then once you're in there, you can just click the wire at the two places indicated.

>> No.6383008

>>6382980

I think it's trying to get you to measure the voltage across the "output" i.e. the voltage across the resistor.

>> No.6383024
File: 39 KB, 959x753, Ididitmaybe.png [View same] [iqdb] [saucenao] [google]
6383024

>>6383008
The task is to measure the output voltage, just getting used to modelling software.

I think I managed it with pic related.

>> No.6383027

>>6383024
Worth noting the "output" is just a label, nothing special, but there is a voltage probe on there.

>> No.6383034
File: 47 KB, 960x762, smallertime.png [View same] [iqdb] [saucenao] [google]
6383034

>>6383024
Same thing over a shorter time.

>> No.6383037

>>6383027

Yeah, that's what I meant.

>>6383024

Well, we can't see shit. Lower the frequency.

Right now I think you measuring from black line to black line (i.e. both the resistor and the cap), which is just going to give you the original signal...

>> No.6383047

>>6383037
I've lowered the frequency

>> No.6383052

>>6383037
And yeh, you're right, I am just getting the original signal back.

>> No.6383063
File: 47 KB, 959x764, other attempt.png [View same] [iqdb] [saucenao] [google]
6383063

>>6383037
Setting the circuit up like this seems to yield what I want. We see the capacitor build up then suddenly discharge.

Moving the voltage probe to the other side of the resistor makes the pulse range from +/- 50.

Whether that's important or not I'm not too sure.

>> No.6383077

>>6383063
Ignore that, moving it to the other side of the resistor gives you no data.

>> No.6383082

>>6383063

No, it's just the voltage source if it's the other side of the resistor. You're measuring the total voltage dropped over the entire circuit...

>> No.6383089

>>6383082
Anyway, the thing off on the right is a voltage probe that I think should be measuring the right part of the output. The little upside T thing in the bottom left is the link to ground. The rest is labelled.

Is that a correct implementation of the circuit?

>> No.6383100

>>6383089
The thing is supposed to be a low pass filter, so... I don't think this is quite right.

>> No.6384529

>>6383100
>Low pass

EE here: Then you fucked it son because that is definitely a HP filter.