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  1. bertus

    measuring output current circuit ?

    Hello, From the wiki: Power Main article: USB hardware § Power USB supplies power at 5 V ± 5% to power USB downstream devices. Low-power and high-power devices Low-power devices may draw at most 1 unit load (1 unit load is 100 mA for USB devices up to USB 2.0, while USB 3.0 defines a unit load...
  2. bertus

    COVID-19

    Hello, An article in Nature about some antibody: https://www.nature.com/articles/s41467-020-16256-y Bertus
  3. bertus

    Heathkit Condenser Checker

    Hello, What would be the value? Those radial are available as newer versions on this page: https://www.vivatubes.com/capacitors/?_bc_fsnf=1&brand=1085&sort=alphaasc&limit=100&mode=6 Bertus
  4. bertus

    LM338 Voltage and Power Questions

    Hello, That is a nice build you made. As @Bluejets said, the TO3 has better thermal properties: If you want a beefier regulator with a lower drop-out voltage, have a look at the LT1083. That is capable of 7.5 A, with a drop-out voltage of about 1 Volt. Bertus
  5. bertus

    Paper shredder tarnader 2050 ec

    Hello, I see a L7812 on the mainboard. Do you have a multimeter? You could measure the output voltage of the L7812. This should be about 12 Volts. The 12 volts can be measured between the middle and the right pin of the L7812. Bertus
  6. bertus

    Paper shredder tarnader 2050 ec

    Hello, Your shredder seems to be quite old: http://www.ebadestructoras.com/catalogo/modelos-descatalogados-y-modelo-de-sustitucion/ Tarnator 2050 EC 1988 / 1994 There are no spareparts available. Post some pictures of the boards. Keep the picture size max of 300k. Use the upload a file button...
  7. bertus

    Why is this Happening to Me?

    Hello, Here is some more info on the "manhattan style" prototyping, that @hevans1944 mentioned. Bertus
  8. bertus

    Paper shredder tarnader 2050 ec

    Hello, Is the shredder a rebranded REXEL shredder? https://www.manualslib.com/manual/875/Rexel-Mercury-Rds-2050.html Bertus
  9. bertus

    Timer 555 voltage

    Hello, From the IP I can see that the user is from the USA. In the USA, Farnell is called Newark: https://www.newark.com/ He might also have a look at Arrow: https://www.arrow.com/ Bertus
  10. bertus

    Heathkit Condenser Checker

    Hello, For 1) The silicon diode will have a much lower voltage drop as the tube rectifier. Often a resistor is used in series with the silicon diode. Read this old thread on the AAC: https://forum.allaboutcircuits.com/threads/replace-a-vacuum-tube-with-diodes.110517/ Bertus
  11. bertus

    SMD Diode Identification

    Hello, As far as I can find, it should be a SMTPB270 transient suppression device. Bertus
  12. bertus

    Heathkit Condenser Checker

    Hello, @(*steve*) , You might be interested in the following pages: http://www.wb0smx.net/?p=2266 http://www.wb0smx.net/?p=2298 http://www.wb0smx.net/?p=2322 He has some more pages: http://www.wb0smx.net/?tag=c3-capacitor-tester http://www.wb0smx.net/?tag=c3-capacitor-tester&paged=2 Bertus
  13. bertus

    Ask for help - circuit design

    Hello, Is this homework? Bertus
  14. bertus

    Why is this Happening to Me?

    Hello, What type of protoboard are you using? The stripboard: The tri_protoboard: The duo_protoboard: Or the singe land protoboard: Bertus
  15. bertus

    Why is this Happening to Me?

    Hello, There are PCB's that will have exactly the same layout as the breadboard. This german site has some. The small one: http://www.ak-modul-bus.de/cgi-bin/iboshop.cgi?showd170!0,0,PCBSB And the large one: http://www.ak-modul-bus.de/stat/steckboardplatine_2,pd1100!0,,PCBSB840.html Bertus
  16. bertus

    Blow fuse

    Hello, Without any information on brand and type it is very hard to say anything usefull. There must be something wrong with TV when it is blowing fuses. Bertus
  17. bertus

    Please help in identifying this (possibly) tiny JST connector

    Hello, When you think it is a JST connector, have a look at the following pages: http://www.jst.com/home20.html http://www.jst.co.uk/products.php?cat=456&nm=Factory+Automation+Connectors http://www.jst-mfg.com/index_e.php Bertus
  18. bertus

    60 GHz rf meters

    Hello, There seem to be some apps for the phone: https://play.google.com/store/apps/details?id=com.cls.networkwidget&hl=en https://play.google.com/store/apps/details?id=com.staircase3.opensignal&hl=en...
  19. bertus

    signal modulation

    Hello, Yes, you are close. In the example, the ASK has no output when a 0 is transmitted. An other name could be OOK (on-off-keying). Bertus
  20. bertus

    signal modulation

    Hello, Keep close track of the timings: Bertus
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