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  1. bertus

    Repair RF amplifier board

    Hello, Did the board come with instructions how to adjust the potentiometers? With a wrong setting of the potmeters, you can burn the transistors. Bertus
  2. bertus

    Repair RF amplifier board

    Hello, The two transistors will be the same as the circuit seems to be balanced. To adjust the bias of the transistors, I see two potentiometeters for setting the bias. Is there a schematic available? Bertus
  3. bertus

    How to connect this strain gauge?

    Hello, Yes, that should be correct. That way the sensor can be used upto 9 Volts. Bertus
  4. bertus

    How to connect this strain gauge?

    Hello, The straingauge IS the wheatstonebridge. You do NOT need to make one on the breadboard. Bertus
  5. bertus

    How to connect this strain gauge?

    Hello, In your set-up the strain gauge will get no power. In my schematic the 4 resistors in a diamand are the gauge. There is a resistor from Vin to the P+ of the gauge and a resistor from the P- to ground. Bertus
  6. bertus

    How to connect this strain gauge?

    Hello, The outer resistors are not connected to the bridge. I have "shifted" the resistors: Bertus
  7. bertus

    How to connect this strain gauge?

    Hello, You could put an 120 Ohms resistor in each power line of the bridge: Then you can use 9 Volts max on the circuit. Bertus
  8. bertus

    How to connect this strain gauge?

    Hello, Is the current for the complete sensor or for one section? If it is for the complete sensor, the max voltage would be 25 mA X 120 Ohms = 3 Volts. I found a couple of sites for the sensor, but no specs are given...
  9. bertus

    How to connect this strain gauge?

    Hello, I have written the boards input names on your sensor picture: Do you have a datasheet of the gauge? That way we can see the maximum exiting voltage of the gauge. Bertus
  10. bertus

    How to connect this strain gauge?

    Hello, The 10 Volts limit is set by the ICL7660. It could be lower as 3.5 Volts, The LM358 works from +/- 1.5 Volts, The AD620 from +/- 2.3 Volts. The board should be able to handle 2.3 to 10 Volts. Bertus
  11. bertus

    How to connect this strain gauge?

    Hello, It looks like it uses a ICL7660 as voltage converter for the negative voltage: https://protosupplies.com/product/ad620-instrumentation-amplifier-module/ Bertus
  12. bertus

    How to connect this strain gauge?

    Hello, The AD620 works from +/- 2.3 AKA 4.6 Volts; This is the gauge circuit from the datasheet: Bertus
  13. bertus

    help with IR2110 chips

    Hello, Here is a link to the resources page: https://maker.pro/forums/resources/ Harald made some for LTSpice: https://maker.pro/forums/resources/categories/ltspice.11/ Bertus
  14. bertus

    Bass Amp Resistor

    Hello, It could be a 3 Watt resistor. Have a look at this page for more info: https://www.electricalengineering.xyz/sheet/resistor-power-rating-chart/ Bertus
  15. bertus

    help with IR2110 chips

    Hello, By renaming the file. Bertus
  16. bertus

    help with IR2110 chips

    Hello, As I said, remove the .txt extention, to get the .001 .002 and .003 files. Bertus
  17. bertus

    help with IR2110 chips

    Hello, Here is the file splitted with 7Zip. https://www.7-zip.org/ Remove the .txt and click the .001 file to unzip the complete file. (I used the .txt extention to be able to post the files). I used the lib_bor name to distinct to from the lib file on my PC. Bertus
  18. bertus

    help with IR2110 chips

    Hello, Unzip the file and copy the _PERSONAL folder to the sym folder of LTSpice. The next time you open LTspice it will be shown. Bertus
  19. bertus

    help with IR2110 chips

    Hello, This is given in the README of the file: My personal collection of LTSpice components Download the zip file and unpack the directory PERSONAL and the files it contains to: %USERPROFILE%\My Documents\LTspiceXVII\lib\sym\ Unfortunately, github adds a directory named "LTSpice-master" to...
  20. bertus

    help with IR2110 chips

    Hello, I think the max size is 5.120.000, wich is about 4.8 Mb Bertus
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