Recent content by AugustCrawl

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    PID Current Control for Laser Diodes

    If you are using a FPGA then you are using discrete control. Discrete control systems can use PID type control, but sometimes (at least in the case of a Microchip Pic controlled line following robot buggy) we found that Bang-Bang control was the better option! In terms of knowing the transfer...
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    Hobbies for electrical engineering (ideas)

    I am studying Electrical Engineering at Uni (I think they call this college in the US). In my spare time I am building my own electric skateboard from RC aircraft parts. It has been a really fun project so far - and if you want to make something that moves, or a fixed wing model plane, or a...
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    Engineering NAND to NOR Circuit - Uni Digital Logic Spring

    You might want to check out Logic Friday :)
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    Impedance Matrix of a Potential Divider.

    Im glad that you've solved it. This is a strangely mathematical way of talking about circuit analysis. It is very probably true and yet slightly weird at the same time!
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    Impedance Matrix of a Potential Divider.

    Another good point to make is that unless the terminals on the right are connected no current I2 will flow.. as there is no path to ground. And if they are shorted then the load is in parallel with no load... and so all of the current will flow through RA only. And if the load on the right is...
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    Impedance Matrix of a Potential Divider.

    An impedence matrix seems like a very sophisticated way of talking about a potential divider... Put "simply" the voltage experienced at the load is: \frac{V_{\text{in}}R_B}{R_A+R_B} = V_{\text{out}}
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    Fan Controller Circuit with Thermistor and R4 - TehnikService.net

    It is not clear exactly from what you've said. A good idea is probably to take a non-blurry, well lit photo of the circuit as it is at the moment. I should be able to see clearly on that and help you further :)
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    Help with Efficiency of a motor

    Well I could write the whole report for you, but that isn't really going to help you learn anything. Have a go at it, read my earlier post carefully and start working things out. A good place to start would be to make an excel spreadsheet -> and then start following the steps. I will help you...
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    Finding saturation range for an opamp?

    The opamp V+ and V- are typically the power pins which power the device. Yes an ideal opamp does have infinite gain... a common op-amp style is a differential op-amp, where a finite gain of say 5 would amply a difference between the input terminals of the Op-Amp from 1Volt to 5Volts at the...
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    Undergrad Solutions to differential equations

    Latex accident! Will repost later today :)
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    Undergrad Solutions to differential equations

    $$ y=\text{Ae}^{\text{$\lambda $x}}\text{ } $$
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    Fan Controller Circuit with Thermistor and R4 - TehnikService.net

    Your IC1 op amp thing is probably part of a package... look at your chip and most likely it is an 8-pin package. Typically the pins count down on the left side and up on the right side if you have it the right way up.1 5 2 6 3 7 4 8 So look at the numbers on the pins...
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    Under-damped second order system - CONTROL

    A step in the right direction :) Is there no transfer function associated with the question? I think knowing the order of the system is useful. Maybe fourth pole means fourth order. I referred to this http://web.mit.edu/2.14/www/Handouts/PoleZero.pdf If when you do the nyquist plot the...
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    Guassian Probability density function

    Plotted :) Not sure quite how to embed the image so that it appears in this post. But its attached & the hand-calculated value looks reasonable :) yes! Think this is how its done.
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    Guassian Probability density function

    Have plotted them :) The files are attached to this post. Need to work out how to get them to flash up here.