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Recent content by Harpy

  1. H

    Combine multiple variable energy sources for constant energy output?

    I have also pondered this question quite a bit, the simple answer is no there isn't a viable system currently available, otherwise alternative energy power supplies would be much more prevalent than they are currently. The primary issue is that you have highly variable supplies, to combine them...
  2. H

    Summing difference amp outputs

    Laplace The kits are predominantly single supply circuits, I think only one circuit has one op amp where a negative voltage is actually generated specifically for the negative rail, all others use the common earth. The power supplies range from 5V to 12V depending on the kit, so I assume all...
  3. H

    Summing difference amp outputs

    The current design is posted below, sorry about the extended story, I have set the two inputs at the extremes of their gain, being unity down to 1/3 attenuation (a new word I just learned), but their operational area is expected to be around 2/3 attenuation, which is 50% on the VR1a & 2a. The...
  4. H

    Summing difference amp outputs

    The final summing has to maintain the same polarity, so I cannot use an inverting summing setup, unless I use a second amp as a buffer and invert it back again, which may well be the final outcome, but there are a number of other questions I need to resolve before I go further with the design.
  5. H

    Summing difference amp outputs

    Been out of action for a few weeks with a few unwanted distractions, getting back into it now. I reviewed your comments re the position of the Zenner diode at the input, I always struggle between providing enough information and writing a thesis. It is an automotive application and large...
  6. H

    Summing difference amp outputs

    You may be right, I can't say right now, need to digest your info and do some research to determine if it does actually fit the desired outcome, not home currently on the road, so only limited internet and no printer scanner etc. I do want to make the design as simple as possible, but as it is...
  7. H

    Summing difference amp outputs

    Yes, overvoltage protection, I have copied bits and pieces from similar circuit types that I have looked at, so layout does need a bit of fine tuning, thanks for the tip, will re arrange the circuit to suit.
  8. H

    Starting out in Electronics

    Coming from another beginner, what do you want to actually make, just doing something for the sake of it can be half hearted, but if you can actually solve a problem, choose a project, the drive and rate which you can absorb information accelerates. What other interests do you have, how can...
  9. H

    Summing difference amp outputs

    Thanks for that, A positive response, kind of gives you a warm and fuzzy feeling all over. When you say virtual earth, as this is a single supply circuit, I assume you are reffering to the positive input and voltage divider(pot) giving an earth reference, this of course would be a floating...
  10. H

    Summing difference amp outputs

    Thanks for the replies, all good, have also posted elswhere, getting used to being ignored, Thanks for the consideration Davenn, have often done the same thing on other forums I am on. duke37, sketch below, I just need to get my head around the resistance and voltage thing, i.e no load...
  11. H

    Summing difference amp outputs

    I am new to this, but have been doing a lot of reading to get up to speed, The circuit I am designing has two primary inputs which go into negative input of difference op amps, with a set reference on the positive input, so the input can be inverted from a rising voltage to a falling voltage...
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