Recent content by cjm181

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    Transformer, Oscillator & transposing fomulae

    But the quadratic doesn't work. I can't see where i have gone wrong. Is my approach miles off? Thanks C
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    Calculating Choked Flow of Propane Through a Valve

    That's what i got!
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    Calculating Choked Flow of Propane Through a Valve

    yes, so what reference gas are we using? is it 1 or 0.65
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    Calculating Choked Flow of Propane Through a Valve

    Nearly. Find the full formula for qvf. What are the terms? Specifically the 1. what term is there?
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    Calculating Choked Flow of Propane Through a Valve

    The relative density of the reference gas is 0.65. The relative density of the actual gas is 1.45.
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    Help with NEXT and FEXT volatage magnitudes

    is it this: t = length √LV td = Tr / 2
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    Help with NEXT and FEXT volatage magnitudes

    is t the rise time? 100ps? I am thinking not, because later in the notes it expresses td to be half the rise time. If so what is t? for both the NEXT and FEXT equations?? thanks Craig
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    Calculating Required Gain for Fifth Intermediate Amplifier

    Thankyou Baluncore. I didnt think of using a spread sheet. Thanks for the tip... Kr Craig
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    Calculating Required Gain for Fifth Intermediate Amplifier

    Fig 1 and Table 1
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    Calculating Required Gain for Fifth Intermediate Amplifier

    Homework Statement FIGURE 1 shows the block diagram of a superhetrodyne radio receiver. In a test a 20 μV signal was fed from the aerial into the first stage of the receiver, a radio frequency amplifier. This signal is the passed through several stages of the receiver to eventually appear at...
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    Solve Katharometer Question: Limit Errors to +0.1% Oxygen

    If the oxygen content changed by 0.1%, then the k value would be: To find the K value of the nitrogen / hydrogen mix with oxygen (5.1%): 1.052 - 1.023 = 0.029 0.029 & 0.051 = 0.001479 0.001479 + 1.023 = 1.024479 So I need to find the percentage change of hydrogen that would give a total k...
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    Solve Katharometer Question: Limit Errors to +0.1% Oxygen

    Homework Statement It is proposed to use a katharometer to measure the amount (about 5%) of oxygen in nitrogen, in the presence of a small amount (0.5%) hydrogen. How constant would the proportion of hydrogen have to be in order to limit errors in measurement of % oxygen to + 0.1%?The thermal...
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    Lead-Free Soldering: Is My 60W Iron Enough?

    Hey Wolram I came across the same issue in the UK for soldering up bullet connectors and alike. I bought a full set of soldering irons, 15, 25, 40 and 80w from maplins. I still couldn't get the lead free stuff to produce a decent joint. I figured it must be my poor soldering. I ended up buying...
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    Finding R, I & V in an PLC output interface

    Does the question not say it's 1v? "Collector emitter voltage when the transistor is on = 1v" Thanks
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    Finding R, I & V in an PLC output interface

    Is it not 8V across the coil? 9V supply, 1V drop across the transistor? I am just asking as I have answered 8V across the coil and across the leg containing R2 and the LED. Thanks