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  1. bertus

    A Stretch

    Hello, I have incorperated the comments on the polarity of the capacitors in the schematic: Bertus
  2. bertus

    A Stretch

    Hello, I found the original page for the posted schematic: https://www.wamplerpedals.com/blog/uncategorized/2020/05/how-to-design-a-basic-overdrive-pedal-circuit/ It has also more info on how to build the circuit. Bertus
  3. bertus

    Micky taking ebay sales?

    Hello, The 709 chip on the photo is even damaged. There are 20 under 6 quid: https://www.ebay.co.uk/sch/i.html?_from=R40&_nkw=lm709&_sacat=0&_sop=15 A lot of sellers don't know any electronics and only look for profit. Bertus
  4. bertus

    Power Electronics for Beginners

    Hello, Have a look at the following books: https://the-eye.eu/public/WorldTracker.org/Engineering/Electrical Engineering/DOE Fundamentals Handbook, Electrical Science vol 1.pdf https://the-eye.eu/public/WorldTracker.org/Engineering/Electrical Engineering/DOE Fundamentals Handbook, Electrical...
  5. bertus

    Power Electronics for Beginners

    Hello, Here is a studybook for power electronics: https://archive.org/details/RASHIDPowerElectronicsHandbook/page/n1/mode/2up Bertus
  6. bertus

    A Stretch

    Hello, As said, your second kit already got the 1N4148. Why did you buy the second kit with SMD diodes? They can not be used on a breadboard or veroboard. If you want more through hole diodes look for this kit...
  7. bertus

    Error uploading photos here

    Hello, Pictures upto 300 Kb should be no problem. Bertus
  8. bertus

    Tektronix 2230

    Hello, When the voltage is jumping, it looks like the circuit is in protection mode for over current. When overcurrent is detected Q935 will act and try to lower the voltage. There must be an overload somewhere. It can be defective transistor, capacitors or chips. I have seen shorts caused by...
  9. bertus

    Problem on high voltage leg on triple output power supply.

    Hello, You already have a thread for this powersupply running: Triple output power supply blowing main fuse Bertus
  10. bertus

    Is that a fuse or resistor

    Hello, Have a look here: https://gs.com.eg/products/Through-Hole-Resistors?q=fusible%2520resistor&Product%2520Range=FWxxA%2520Series Bertus
  11. bertus

    Is that a fuse or resistor

    Hello, This video will explain the fusible resistor: Bertus
  12. bertus

    Tektronix 2230

    Hallo, Do you have the service manual? http://www.jabse.com/L1Rla3Ryb25peC8yMjMw It might give you some support in the search. Here is the powersupply schematic from the manual: Bertus
  13. bertus

    To Short or not to Short- that is the question

    Hello, You will encounter different types of schematics. These pictures show the difference between the old method and the new method for drawing a schematic crossing: This can be confusing, so take a good look wich method is used. Bertus
  14. bertus

    A Stretch

    Hello, If the dual opamp confuses you, you can also use a single opamp version, the TL081. They exist in single, dual and quad: Bertus
  15. bertus

    Monopole antenna length.

    Hello, The antenna also needs a ground. A more complete antenna would be the ground plane antenna. Here is a page with a calculator: https://m0ukd.com/calculators/quarter-wave-ground-plane-antenna-calculator/ Bertus
  16. bertus

    Comedy Thread

  17. bertus

    Account closure

    Hello, Don't you have a paintlike program? That can likely resize the picture. Bertus
  18. bertus

    Account closure

    Hello, You can upload pictures using the "Upload a File" button. Keep the size around 300 Kb and you will be fine. Bertus
  19. bertus

    Accelerometer circuit design

    Hello, Perhaps you can get some info from the wiki page: https://en.wikipedia.org/wiki/Accelerometer Bertus
  20. bertus

    Questions DVD disc media

    Hello, How can the mentioned substances be in the air? https://en.wikipedia.org/wiki/Hydrochloric_acid https://en.wikipedia.org/wiki/Sodium_hypochlorite Always store chemicals in the holders they are supplied in. Keep the holders well closed. Bertus
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