Search results

Search Forums New Posts
  1. bertus

    Using 15A 250V power cord instead of 10A 250V

    Hello, You can always use a higher amperage for the cable. When the amperage would be lower, there might be a problem. Bertus
  2. bertus

    Strange BLDC wave form and failed drivers

    Hello, @Oleg.normalniy , What are you trying to show? The video link does not work and leads to a login page. Bertus
  3. bertus

    Design fix on a battery powered COB LED

    Hello, The AAA batteries would last about 4 to times longer when you take a alkaline type. When using AA you will win a factor 2 again in comparison with the AAA. You could use a boost converter with a MAX668. Have a look at the figures 2 and 5 of the datasheet. Bertus
  4. bertus

    Design fix on a battery powered COB LED

    Hello, You are clearly abusing the little CR2032 batteries: Your led can draw 170 mA, as the battery data states a maximum discharge current of 3 mA or pulse discharge of 15 mA. Better look for other more powerfull batteries. Bertus
  5. bertus

    Powering system using battery

    Hello, The AAA look a little bit small for the application. The 2 X 9 Volts will even be worse, as some are made of 6 X AAAA batteries inside or have a couple of button cells inside. https://www.rfcafe.com/references/electrical/aaaa-cells-inside-a-9volt-battery.htm Or watch this video from...
  6. bertus

    I would like help with Linear power supply unit design calculation

    Hello, Have a look at the attached PDF. Bertus
  7. bertus

    Design fix on a battery powered COB LED

    Hello, What kind of button cells are you using? There are so many different types. On this page of the wiki, you will find a list: https://en.wikipedia.org/wiki/List_of_battery_sizes There are also the dimentions given on the page for all types. Bertus
  8. bertus

    Organ Farfisa 251S

    Hello, The SN29730 is not an oscillator, but a dual one shot. It needs to be triggered to produce an output pulse. Bertus
  9. bertus

    Self oscillating flyback converter

    Hello, Perhaps the following PDF will help...
  10. bertus

    Rain gauge resetter

    Hello, Do you want to break the powersupply from the batteries? Put a piece of double sided PCB between the battery ans the contact of the battery holder. Make a couple of wires on the PCB on bothe sides of the piece of PCB. The wires can be connected to a contact that can break the supply. Bertus
  11. bertus

    1960? B.C. (before cassettes)...

    Hello, Waht to say about the early data cassette used in the EPSON HX20: http://www.vintage-calculators.nl/page91.html Not 1960 B.C. , but very old for computers (1982 - 1987). I even had to work with this type of "computer". Bertus
  12. bertus

    Circuit recommendation?

    Hello, The schematic that @Harald Kapp gave you, is also in the thread I gave you in post #2: Bertus
  13. bertus

    Detecting horizontal position

    Hello, How about a potmeter? From the sensor booklet of Forrest Mims: The voltage will give you a measure for the angle. You could use a window comparator to see if the platform is to high or to low. Bertus
  14. bertus

    Book Reviews

    Hello, The following make books might also interest you, available at the internet archive: https://archive.org/details/EncyclopediaOfElectronicComponents.Volume2CharlesPlatt Bertus
  15. bertus

    Circuit recommendation?

    Hello, Did you ever have a look at the thread of the AAC I gave you: https://forum.allaboutcircuits.com/threads/leds-555s-flashers-and-light-chasers.19075/ It has a lot of led and NE555 circuits. There are also circuits to make patterns with leds using the 4017 or 4022. Bertus
  16. bertus

    speaker dc jack repair

    Hello, The picture on your google drive does not show. Please upload the picture to the forum using the "Upload a File" button. Keep the size in the order of 300 Kb to upload. Bertus
  17. bertus

    Femtofet soldering

    Hello, There are some open source projects to make a reflow oven / hotplate...
  18. bertus

    Femtofet soldering

    Hello, Have a look at the attached PDF. Bertus
  19. bertus

    Comedy Thread

    Found at AAC: Bertus
  20. bertus

    Femtofet soldering

    Hello, What does the datasheet say? It has likely a temperature diagram for a flow oven. Bertus
Top