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  1. bertus

    Diode Questions- Attempt at Vintage Turntable Resurrection

    Hello, The 1S2473 could be replaced by an 1N4148. An 1N4448 would be better. The RD5-6EC is an 400 mW 5.6 Volts zener diode. An 1N725, an 1N752 or an 1N5524 would do. http://matthieu.benoit.free.fr/cross/zindex.htm Bertus
  2. bertus

    Electronics Resources forum

    Hello, @Ian , @eerob , @eeadam : Can there be a forum for Electronic Resources? I know that AllAboutCircuits has such a forum. There is stated : Get help with electronics resources, including books, websites, datasheets, technical literature, and software. In that forum datasheets, databooks...
  3. bertus

    Audio Marantz PM500

    Hello, @Tha fios agaibh < I found some more info on the QF01 and QF02 chips. They are the Toshiba HA1457. Bertus
  4. bertus

    Basic Pulse generation help

    Hello, Are you able to build a generator yourself as in the schematic of post # 23: https://www.electronicspoint.com/forums/threads/basic-pulse-generation-help.292079/page-2#post-1792001 It is much simpler and the duty cycle will always around 50 %. Bertus
  5. bertus

    Basic Pulse generation help

    Hello, Wich of the screws ia getting a bit hot? That shoud not happen, unless it is a bad design. Bertus
  6. bertus

    Basic Pulse generation help

    Hello, Wich range did you test? I would try range 2 : 50 Hz - 1 kHz Bertus
  7. bertus

    Jim Williams - tribute

    Hello, Here are a couple of books that make a tribute to Jim Willams, a great designer of electronics: https://archive.org/details/Jim_Williams_Tribute Bertus
  8. bertus

    Basic Pulse generation help

    Hello, The speed that will be detected is likely so high that you will not see the led blink. Adjust the speed much higher and see if there ia any change. Bertus
  9. bertus

    TNY264 - What do the other ID numbers mean please?

    Hello, The TNY264 seems to be a controller for a small switched mode power supply. The G behind the number stands for the SMD casing. Bertus
  10. bertus

    Basic Pulse generation help

    Hello, Do you have any other transistors available? It looks like any small signal transistor can be used. Bertus
  11. bertus

    Basic Pulse generation help

    Hello, You could try it the way you describe. It can be that the signal goes not low enough, but to the test. Bertus
  12. bertus

    Basic Pulse generation help

    Hello, What kind of meter did you use? A DMM (Digital Multi Meter) or an analog one ? Bertus
  13. bertus

    Basic Pulse generation help

    Hello, What voltage did you get on pin 20? Is it about the supply voltage? It can be there is a pull-up resistor inside the unit. Bertus
  14. bertus

    Basic Pulse generation help

    Hello, Do you have specifications what signal is expecpted at pin 20 of the instrument cluster? Bertus
  15. bertus

    Basic Pulse generation help

    Hello, A resistor can be used to limit the current into a device. Some devices, like the leds, are current controlled and a resistor is a must to limit the current. Bertus
  16. bertus

    Audio Marantz PM500

    Hello, Then you only swapped the input signal connections. There are no parts involved, that clears the part of changing channels. Swap them back. There must be something wrong in the electronics. Bertus
  17. bertus

    Audio Marantz PM500

    Hello, Where are these JH parts in the schematic? Can you post a snaphot from the manual? It sound like the channel with the faulty parts starts to oscillate. Bertus
  18. bertus

    Help required to identify circuit board

    Hello, More reference designators can be found on this page of the wiki: https://en.wikipedia.org/wiki/Reference_designator Bertus
  19. bertus

    Basic Pulse generation help

    Hello, @majoco , When you think that a post is not suitable for the thread, you can use the report button to attract the attention of the staff. Bertus
  20. bertus

    Opensource books and articles on the internet archive

    Hello, The internet archive has a collection of opensource books and articles: https://archive.org/search.php?query=electronics%20opensource&and[]=mediatype%3A%22texts%22&and[]=languageSorter%3A%22English%22 Bertus
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