Search results

Search Forums New Posts
  1. bertus

    Femtofet soldering

    Hello, As the part is only 0.75 X 0.75 mm , you can not use them to solder wires to them. They are soldered directly to the PCB, likely using a hotplate. For better pictures, try to use the macro function of the phone. Here is an example of some SMD parts. The 1822 resistors are 2 mm and the...
  2. bertus

    Powering LEDs Question

    Hello, Looking at the back of the PCB in the video, each resistor is connected to one led: Bertus
  3. bertus

    Micro controlling resistance

    Hello, The TBD chips have a clamping circuit inside. They can be connected directly to the 595. Bertus
  4. bertus

    Micro controlling resistance

    Hello, Pin 10 of the TBD is for protection when an inductive load is used. You can leave it open for now. Bertus
  5. bertus

    Micro controlling resistance

    Hello, If you want to make the multi resistor approach, as in post #13, you might want to have a look at the TBD6208X series. Bertus
  6. bertus

    Powering LEDs Question

    That will likely not work, as the output voltage of the 555 will be to low. The output voltage is about 2 volts lower as the supply voltage. The original circuit uses a current of about 15 mA for each led. Perhaps make 3 strings of 4 leds with a resistor of 120 Ohms in each string, wich will...
  7. bertus

    Powering LEDs Question

    Hello, @Bluejets , It is not wise to put several leds direct parallel: https://electronics.stackexchange.com/questions/174584/is-it-ok-to-put-leds-in-parallel And an other page with the why: http://lednique.com/parallel-leds/ Bertus
  8. bertus

    Powering LEDs Question

    Hello, The circuit will draw a current of 12 X ledcurrent. When using 6 X 2 leds in series , the used current can be half, and prolong the battery life. Here is a larger picture of the schematic from that video: Click on the picture to show it even larger. Bertus
  9. bertus

    img stage line sta 500

    Hello, I also could not find the service manual. Only the operation manual is available: https://www.img-stageline.com/products/pa-systems/pa-amplifiers/analogue-pa-amplifiers/sta-500/ When the amplifier is stereo, have a look at the other channel to find the resistor value. Bertus
  10. bertus

    databooks on the internet archive and bitsavers

    Hello, Here I have a link to the internet archive for semiconductor data books: =mediatype%3A%22texts%22']https://archive.org/search.php?query=semiconductor data book&and[]=mediatype:"texts" And here for tube datakooks: =mediatype%3A%22texts%22']https://archive.org/search.php?query=tube data...
  11. bertus

    databooks on the internet archive and bitsavers

    bertus submitted a new resource: databooks on the internet archive - databooks Read more about this resource...
  12. bertus

    Cross reference lists

    Hello, I always use Yahoo advanced search: https://search.yahoo.com/web/advanced?ei=UTF-8&fr=altavista&p=&guccounter=1 It often gives different results than google. Bertus
  13. bertus

    ballast uvc lamp cold cathode

    Hello, Does the seller where you bought the lamp not offer a driver for the lamp? Bertus
  14. bertus

    Oscilloscopes bandwith and sampling rate (digital)

    Hello, Have a look at this PDF: www.tek.com/dl/03W_8605_6.pdf More scope subjects over here: https://www.tek.com/learning/oscilloscope-tutorial Bertus
  15. bertus

    Cross reference lists

    Hello, When you are looking for tube data and more, have a look at this page: http://www.tubedata.org/links.html Or this page: http://www.audiotubes.com/ Bertus
  16. bertus

    Surge Protection for Circuit

    Hello, Have a look at brennenstuhl, that is for the european market...
  17. bertus

    Diodes

    Hello, Do you mean this diode: https://www.arrow.com/en/products/r2160/microsemi Bertus
  18. bertus

    Cross reference lists

    Hello, @shrtrnd , Do you know this page for more cross reference lists? http://matthieu.benoit.free.fr/cross.htm And if you are looking for old databooks, have a look here: http://bitsavers.org/components/ Bertus
  19. bertus

    Surge Protection for Circuit

    Hello, The shown circuit could be a reverse polarity protection. When the wrong polarity is connected the diode will conduct and the fuse will be lown. Bertus
  20. bertus

    Cross reference lists

    Hello, Unfortunately, the resources seems not to support other files than images. I also found a transistor cross reference book on the internet archive: https://archive.org/download/transistorcrossreferenceguide/Transistor%20Cross-Reference%20Guide.pdf Bertus
Top