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  1. bertus

    Can't find the transformer I need so need to build my own

    Hello, You can NEVER get more out than you put in. 230 V X 16 A = 3680 Watt 58.4 V 140 A = 8176 Watt The EDUCYPEDIA has a couple of pages with info on transformers: Transformers Transformer types Bertus
  2. bertus

    Sloppy Schematic Questions

    Hello, That is why I use Yahoo as search engine. The advanced gives you more options: https://search.yahoo.com/web/advanced?ei=UTF-8&fr=altavista&p= Bertus
  3. bertus

    ESP8266 for controlling selenoid door lock

    Hello, How are you powering the nodemcu? This page shows a Vin of 7 to 12 Volts: https://www.theengineeringprojects.com/2018/10/introduction-to-nodemcu-v3.html The relay module needs 5 Volts for the relay to work. Bertus
  4. bertus

    Sloppy Schematic Questions

    Hello, Have a look at this query: 1N4004 Bertus
  5. bertus

    Comedy Thread

    Thanks to cmartinez AAC
  6. bertus

    Sloppy Schematic Questions

    Hello, The diodes D1 to D4 are marked as 1N4004, wich are quite common. There is a series from 1N4001 to 1N4007 depending on the reverse voltage. Even a simple diode as the 1N4148 will do in that position. Bertus
  7. bertus

    Sloppy Schematic Questions

    Hello, The diodes D1 to D4 are there for a crude method of triangle to sine conversion. It looks like the schematic is a direct copy of the wiki: https://commons.wikimedia.org/wiki/File:Sine_sqare_triangle_generator_values.svg bertus
  8. bertus

    Chosing a Microscope

    Hello, Many users here do have accounts on AAC to. Why not register over there? All About Circuits belongs to the same group as Electronics Point NETWORK SITES AllAboutCircuits.com EEPower.com Maker.Pro Mikrocontroller.net Bertus
  9. bertus

    Decoupling capacitor... how to?

    Hello, Have a look at this thread on AAC: Decoupling or Bypass Capacitors, Why? Bertus
  10. bertus

    Transistor prototype photo

    Hello, As @Martaine2005 said, “tubes” and “valves” are used interchangeably, they refer to exactly the same thing. https://spartanmusic.co.uk/blogs/smblog/beginner-guide-to-tubes-valves-in-amps-audio Bertus
  11. bertus

    Transistor prototype photo

    Hello, I have extracted the article pages and reduced the pages from the very large PDF. Bertus
  12. bertus

    Sloppy Schematic Questions

    Hello, Bertus
  13. bertus

    Antenna Design to Capture Atmospheric E-field Gradient

    Hello, Most energy harvesting is done by solar, magnetic, piezo or thermo-electric: https://www.analog.com/en/parametricsearch/11503#/ Bertus
  14. bertus

    Transistor prototype photo

    Hello, The following page has some more info: https://www.computerhistory.org/revolution/digital-logic/12/273 The pages 2 to 5 show the origenal article: https://archive.org/details/sim_electronics_1948-09_21_9/page/n1/mode/2up Bertus
  15. bertus

    400Hz Converter Repair

    Hello, Your picture was way to large (2.6MB). Pictures of about 300 kB are fine. I have resized the picture: Bertus
  16. bertus

    Comedy Thread

    Thanks to SamR AAC
  17. bertus

    Repurposing LED torchiere LED light - 12V or 24V

    Hello, I am not saying these are the leds, but they look similar: https://cree-led.com/products/j3030/jseries-3030 Bertus
  18. bertus

    Repurposing LED torchiere LED light - 12V or 24V

    Hello, Could you post a close-up of one led, with the size of the led? There are several SMD led sizes: https://www.pcboard.ca/led-1206-wired That way we can estimate the current of the led. Bertus
  19. bertus

    Repurposing LED torchiere LED light - 12V or 24V

    Hello, It looks like three groups of 13 leds parallel in series. I tried to change the colors to see the traces of the groups: Bertus
  20. bertus

    TPS57040 Buck converter wont work

    Hello Did you follow the recommendations for the pcb design? There should be thermal vias under the chip. The bottom of the chip should also be connected to ground Bertus
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