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  1. bushtech

    Chinese Hiland 0-30V/Audioguru PSU build (down the rabbit hole)

    Apologies Audioguru, my bad. It is RV1(5k). I don't know what has changed but I can now adjust from 54mV down to 32 mV. Is that 0 for all intents and purposes?
  2. bushtech

    Chinese Hiland 0-30V/Audioguru PSU build (down the rabbit hole)

    I am trying to set the power supply's 0V. All pots turned right down, no dummy load attached. DMM set to 2V and connected to the 2 output leads. DMM reads a steady 0.6V and turning RV2 (the 5k pot) I see no change. Pin 4 of U3 reads -1.37V. Have checked the RV2 pot and it works, 0 to 5k both ways
  3. bushtech

    Denon AVR-1912 E2/EA

    Have a look at 73's de Edd's VCC block diagram in post #21. There you can see the 2 rails going to the two IC's giving + and - 8V and you can also see where you can find a ground point which should not give you confusing answers
  4. bushtech

    Denon AVR-1912 E2/EA

    That's certainly more equipment than I have. I use a 50W temp controlled soldering iron. Runs from 150 to 450. I find 350ish good for soldering and dial it up to about 450 for problematic desoldering. I try to help where I can but I'm still a long way from knowing whats going on. For that you...
  5. bushtech

    Need help with Nakamichi AV-1

    https://www.manualslib.com/manual/1355787/Nakamichi-Av-1.html Havent downloaded it, give it a try
  6. bushtech

    Denon AVR-1912 E2/EA

    Hang in there Michael, you will succeed with the help of the hugely knowledgable guys helping you. Just be methodical and keep copious notes of the results of your actions. Regarding the track lifting, maybe up the temperature of your soldering iron and do put some rosin and extra solder on the...
  7. bushtech

    Denon AVR-1912 E2/EA

    Btdt Michael. You live and learn.
  8. bushtech

    Digital piano won't power ON

    If you have set it to X10. Put probes on, check reading, swop probes, check reading. One way you should get full deflection, other way you should get some deflection. If so schottky probably OK
  9. bushtech

    Digital piano won't power ON

    It's easier to test a schottky with an analogue MM. Have you got one?
  10. bushtech

    Digital piano won't power ON

    Phew! I suggest you source a new transistor just to be safe. Cheap insurance. Heat up and wick the holes individually. Just keep in mind that I am no expert with donkey years of experience so be warned:D
  11. bushtech

    Digital piano won't power ON

    You add the solder to the bottom of the board where the legs stick out
  12. bushtech

    Digital piano won't power ON

    From 73 de Edd post #21: you place a dot of rosin flux onto each of the existing solder joints and feed in fresh 60/40 solder, until you achieve a much larger molten solder mass of each, with them being about the size of a 3/16 ths of an inch ball at each joint
  13. bushtech

    Digital piano won't power ON

    Yep, makes the old solder flow more easily
  14. bushtech

    Digital piano won't power ON

    Did you put some extra solder on the three legs?
  15. bushtech

    Chinese Hiland 0-30V/Audioguru PSU build (down the rabbit hole)

    Ah OK Thanks Audioguru
  16. bushtech

    Chinese Hiland 0-30V/Audioguru PSU build (down the rabbit hole)

    I think only if you want to fiddle around with storing data. As i see it I have 2 options for separate power: 1. Use some 18650's, got plenty and enough chargers 2. Use the second tap on the transformer via a bridge rectifier, was going to use use it to build a - rail but don't think that will...
  17. bushtech

    Chinese Hiland 0-30V/Audioguru PSU build (down the rabbit hole)

    Thanks Audioguru. Had a look on banggood but the one with the display uses 2 pcb's with interconnecting 5 core ribbon. So doubt that I could hack it even if I could get the display separately. But I found this: OLED display and goes down to 0V...
  18. bushtech

    Chinese Hiland 0-30V/Audioguru PSU build (down the rabbit hole)

    I can see one problem: 3.Voltage: test range: 6.5~100V Any way to get around this?
  19. bushtech

    Chinese Hiland 0-30V/Audioguru PSU build (down the rabbit hole)

    Starting to look at another display for the power supply. Your statement:" I don't know if the display uses many LEDs for high current or an LCD for very low current." got me thinking. How about an lcd display like this: Link here...
  20. bushtech

    Chinese Hiland 0-30V/Audioguru PSU build (down the rabbit hole)

    Thanks Audioguru. I managed to sort it. The problem was not the cold one but the hot one, One of the bolts bolting the 3055 down was not quite tight causing improper heat transfer ergo hot 2N3055. Nipped it down and the 2 power transistors now about equal heat wise. Thanks for that headsup on...
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