Recent content by Callum Plunkett

Thank you for the help! much appreciated.

Sorry for my very late reply, especially as I was looking for help. The method I used was: 0.35/tr with when tr is 90-10 of the final value. Thanks every one for the help provided and once again I apologise for the late reply.

I have been given the attached following question: FIGURE 2 shows the response of a first-order filter to a step input. Estimate the half-power cut-off frequency of the filter and sketch its frequency and phase response. I believe that I have correctly calculated the half-power cut-off...

It’s been a while (sick family member and so on..) but I’ve finally found some time to give this another go. I recreated both circuits and inserted a bode plot, to the left of C3 to gain the following graphs. I’m not 100% certain that I have all the settings for the simulation set correctly or...

Yeah I thought that 65kHz was abit off as I calculated the single stage phase angle as 68 degrees each for the RC ladder network, when I was hoping for something along the lines of 60 degrees. Thanks for the pointers, I am going to make an attempt tomorrow.

Thanks for the reply! I’ve calculated the frequency of oscillation of about 65kHz. I was hoping to graph both an ideal op-amp and a TH072 op-amp and compare them. Another issue I’m having is with the unwanted capacitances within the TL072 and how to determine the value of them. Unfortunately...

Wonderful Thank you that's helped a lot

I’ve been given the attached question and equation in regard to output offset. I know all the required values apart from Rf. Normally id assume Rf was the feedback resistor however that (as far as I can tell from the circuit) is marked as R2. Would I be right if I assumed this value was Rf =...

I was wondering how you came up with the gain values for each channel. But it seems I over looked the equation as mentioned by bob012345. Cheers guys.

How did you come up with the coefficients of 10,20,30,40 and RF of 3.5? I’ve arbitrarily used 10kohms for my RF with coefficients of 10kΩ, 13.3kΩ, 20kΩ and 40kΩ which should give me gains of 1.25, 2.5, 3.75 and 5. I was hoping as there are 4 inputs at 5volts each that 5/4=1.25 and multiples...

I did that in an earlier attempt at the question, I can't remember why now but I decided to ty a different method. Might have to reconsider going back to it.

There is a lot of information here and its a massive help. Electronics isn't something I do that much of at home or at work so it does not come that natural to me. Thank you guys.

Sorry for the late reply I've been busy with work the past few days and have not had a chance to get back to anyone.