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  1. Arouse1973

    Op Amp Stability

    LVW Said: 1.) Main Parameters * Beta: I think it would be useful to define the resistors R1 and R2 using a ref. to Fig. 5 Done LVW Said: * Acl: Use beta again (instead of B) - otherwise one can assume that there is a difference between B and beta. Yep, missed that one. I must have edited it...
  2. Arouse1973

    Op Amp Stability

    Thanks for the feedback. I'll go through your comments and let you know. I appreciate your comments. I'll re-check my connection. An Linear Tech engineer showed me this a while ago, I may have it wrong. Adam
  3. Arouse1973

    Op Amp Stability

    If this is taken well then after opamps I plan to do some more over the coming year. These include transmitting IR over distance and calculating the correct power, LED angle etc. wirless power transfer. And the big one EMC. I will also encourage very very much for others, Steve, Harald, Dave...
  4. Arouse1973

    Op Amp Stability

    Thanks for the comment Lvw. I'll look at your comments later. Did you like the post anyway? You didn't say. Adam
  5. Arouse1973

    Op Amp Stability

    All done apart from the picture edit. I am working on that. Adam
  6. Arouse1973

    Op Amp Stability

    Thanks Ian. Works fine now. Adam
  7. Arouse1973

    Op Amp Stability

    Well Guys, your thanks inspire me to carry on. Steve or Harald please feel free to edit my post as you feel fit if you see any mistakes you can PM me if you want so I can update my master document at home. This took me along time in the evenings correlating simulation with real world. Sorry for...
  8. Arouse1973

    Op Amp Stability

    Arouse1973 submitted a new resource: Op Amp Stability - Information and solutions to stability problems you can get with op-amps Read more about this resource...
  9. Arouse1973

    0-60VDC POWER SUPPLY CONTROLLED BY 0-5VDC

    Ok I will work on a new thread this week in the evenings and see if I can get something useful together. Give me a bit of time as I am at work this week. Cheers Adam
  10. Arouse1973

    Inductive Voltage Help

    Yes this is wireless power transfer and yes it is just the standard resonant formula. But you have to include the mutual inductance of the two coils. Planer coils are no more complex it's just when working out the inductance you need to consider the substrate you are using. False triggering will...
  11. Arouse1973

    0-60VDC POWER SUPPLY CONTROLLED BY 0-5VDC

    Right I have done a couple of simulations to see how the phase margin was effected but a time delay in the output loop. What I did was simulate the original circuit minus the opamp and find the time difference between the two which turned out to be about 2us. Then run a open loop simulation with...
  12. Arouse1973

    Inductive Voltage Help

    Oh that's a new beast. Been looking at that only last week. Very imprest can get about 50mm with plastic former coil of about 400uH. Very impresive results. Cost about twenty quid from Farnell. Adam
  13. Arouse1973

    0-60VDC POWER SUPPLY CONTROLLED BY 0-5VDC

    Yep ok. Give me today as I am decorating today. Adam
  14. Arouse1973

    sniffing with a sniffer

    Great ok.
  15. Arouse1973

    0-60VDC POWER SUPPLY CONTROLLED BY 0-5VDC

    I wouldn't want to add any capacitance but the propogation delay for the loop is going to be quite small. I think you will still have a reasonable phase margin. I'll have a look later. I bet I am wrong again :) you could add some resistance to the vref input to give the output chance to catch...
  16. Arouse1973

    sniffing with a sniffer

    Looking good. Ferrite beads? Why?
  17. Arouse1973

    electronic theory question

    Does he mean effciency of class B?
  18. Arouse1973

    Phase Shift Oscillator

    I wonder what does making each stage have an impeadance of 10 times more than the last section do? This quite common on cascaded filters without having buffers. Adam
  19. Arouse1973

    Phase Shift Oscillator

    Nope! I just like Laplace's comments
  20. Arouse1973

    Phase Shift Oscillator

    Spot on Laplace. Adam
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