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Recent content by wogoos

  1. W

    Minimum Capacitance Cx on LM555

    Thanks for your response but that doesn't allow me to read it in a microcontroller.
  2. W

    Minimum Capacitance Cx on LM555

    That is correct, a simulation doesn't know that, that is why I have added a 50pF fix capacitor in parallel with the variable capacitor. That 50pF in the schematic of the simulation symbolizes the sum of stray+ input + zero level sensor capacitance + wires.
  3. W

    Minimum Capacitance Cx on LM555

    Hi MTwieg, I did a simulation with an 555 the two R1 and R2 resistors were 1M, and I used a variable capacitance between 50 and 550pF. I did see some nonlinearity for C=10..30pF after that the frequency of the LM555 output followed quite well the formulas. this simulation didn't indicate any...
  4. W

    Minimum Capacitance Cx on LM555

    Dear reader, I want to measure a Capacitance between 10pF and 500pF and feed that information to a microcontroller. I was wondering if an LM555 configured in Astable Operation could do the job. The problem I have is that most LM555 charts show the relation between capacitance connected at the...
  5. W

    [SOLVED] ArduinoFFT.h generates weird results

    Thanks for the help I was informed that in my case windowing is not needed because I measure precise over one period. I tested it and now the values are generated as expected. For others someone on an other forum told me that the HANN windowing has a bug, I don't know what the exact problem is...
  6. W

    [SOLVED] ArduinoFFT.h generates weird results

    Hi folks, I have a question about ArduinoFFT.h running on a Atmega328. I use it on a perfect sine wave sampled with 32*Fb the base frequency of 60Hz with no DC component and no harmonics. The array vReal[SAMPLES] is loaded with the 32 values, one sine cycle period I have generated in excel. The...
  7. W

    [SOLVED] LT spice Simulation AD8220 shows some weird results and I don't know why

    I found the solution. The U4 negative voltage Vs- should be -1...-5 Volt. The specification does show this simulation test with U4 Vs- at zero volt but they have the reference at 2.5V. In that station it works too. The problem is solved.
  8. W

    [SOLVED] LT spice Simulation AD8220 shows some weird results and I don't know why

    Thanks for your commend Klaus 1624607823 Thanks for your commend Barry 1624608893 forgot to add the LT-Spice file. Here is the file for the ones who like to give it a try
  9. W

    [SOLVED] LT spice Simulation AD8220 shows some weird results and I don't know why

    Hi Analog engineers First something info about the circuit. I'm designing a Current control for a switched mode oversupply with a feedback (FB) voltage of 1.215 Volt ( the U5 reference has a little more 1.23V but for the simulation that doesn't matter). The current control is done by a...
  10. W

    How good is ultiboard?

    Hi i have a general question about Ultiboard: How good is the auto-routing function compared with other auto-routers? I ask this for different reasons. I have tried to route 0.5mm SMD chips using 10mil nets and that works but you need to use quite some tricks to get it done. I...
  11. W

    Do XR7 250Vdc 1206 SMD capacitors exist

    I hope some one can help me on my following question. I see at aliexpress XR7 250Vdc 1206 SMD capacitors ranging form 1..100uF. A check on Digikey and Mouser learns me that the maximum Capacitance for the the given SMD capcitors they sell are 3.3uf. I asked this question to my Chinese friends...
  12. W

    Virtual Studio ArduinoIDE 1.9 and STM32F103C Compiler problem

    Dear reader I work with MS VS to program ATmega ESP and STM32103C micro controllers. I work with the Arduino IDE 1.9. extension and have installed the standard STM32F environment. My problem relates to the STM32103C. Compiling and uploading works fine for software without Include files or the...
  13. W

    SZBK07 300W 20A Buck converter

    Thanks Brian, I did have my doubt about the LT8711 because I can trace one of the gate drivers from the photo and that one doesn't line up with the pinning. One of the next responses confirms that. Beside the fact that the LT8711 application notes work with external PMOS and NMOSFETS and that...
  14. W

    SZBK07 300W 20A Buck converter

    Sorry folks I made a typo its not the TL8711 but the LT8711 Hope this helps. I also investigate this board a little more and found the following info. I hope there is some one who can solve some of the question marks.
  15. W

    SZBK07 300W 20A Buck converter

    Hi Betwixt, Thanks for your response, your remark on 1) is correct but on the other hand there is a guy that has tested it in a video with a load of 18Amps if i remember well and that worked. But again a fan is probably needed and that's not a problem. Your point 2) is also correct the work...
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