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  1. bushtech

    LED Dimmer suited for task?

    The switch that it will be mounted into is well insulated including the plastic knob. Can I stick an opto isolator in there? Ooops I see there is one in there. Is there a better design somewhere?
  2. bushtech

    LED Dimmer suited for task?

    Thanks dorke Yes they are dimmable. Light fitting takes 3 bulbs as in first photo, each 6W
  3. bushtech

    LED Dimmer suited for task?

    Here's a design I found here: https://www.homemade-circuits.com/dimmer-circuit-for-led-bulbs/ Usable? This will be for 18W of led's
  4. bushtech

    LED Dimmer suited for task?

    Thanks dorke. Led's still working. Wired a on/off switch in there ilo the dimmer.Data sheet is one of the PRC's usual things This forum's resources area has an led section, thanks *steve*. It does list some dimmers and I have some 555's. But looking at the link...
  5. bushtech

    LED Dimmer suited for task?

    Thanks Dorke So they sold me the wrong thing?
  6. bushtech

    LED Dimmer suited for task?

    Thanks St Edd Those readings persist even with the pot clicked off:confused: I think it's history. Just need to know where to go from here as per Post #4
  7. bushtech

    LED Dimmer suited for task?

    Thanks kellys_eye Reinstalled the dimmer to check but couldn't reproduce the arcing, whatever is causing it has probably died. Checking the pot: (in situ) Note: DMM in 2M range Left and centre pin (as per above photo): 0Ω Left and right pin: 0.8MΩ from off click right through to max Right and...
  8. bushtech

    LED Dimmer suited for task?

    I bought this dimmer and the 3 led lights that it's meant to drive from an electronics place. Worked fine for about 10 hours after which I could hear some crackling in the dimmer, upon investigation I could see some sparking in the pot. The heatsinked transistor is a BT137. The lights are...
  9. bushtech

    Success at last

    Ouch!
  10. bushtech

    Any Linux (specifically Ubuntu) users here? HELP!

    If it comes back there is probably an entry for it in the repository that needs to be removed as kilgorecemetery said
  11. bushtech

    Any Linux (specifically Ubuntu) users here? HELP!

    Have you tried something like this: sudo apt-get --purge autoremove packagename ? But you have to get the packagename correct
  12. bushtech

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

    Unsoldered one leg of R21 and it reads 9.93kΩ
  13. bushtech

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

    Thanks Audioguru Because on my meter it shows as +1.5V with neg probe of meter connected to neg of C1 Here is a photo of D% and D6 link to the diodes I am using: http://www.mantech.co.za/Stock.aspx?Query=64M0002and Yes, connectivity one way but not other way. Also use analog MM on X1 and...
  14. bushtech

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

    U3 Voltages currently: 1 1.68V 2 0.92V 3 0.75V 4 1.5V Then this is +1.5V 5 1.71V 6 1.80V 7 31V 8 0V
  15. bushtech

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

    Thank you so so much for looking at this Audioguru 1.Pin 6 of U3 is 1.7V. I think this is new and hopefully good news 2. R21 is 10k, waiting for replacement C8 3. I am probing with red + probe. Black probe attached to neg of C1. Do I need to reverse the probes to read pin 4. If so, then it is...
  16. bushtech

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

    Still waiting for parts but I think this might help to point to problem areas Voltages on either side of components.Some voltages could be transposed. Audioguru, I hope you can spot something that's been missed so far. Please Thanks
  17. bushtech

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

    So this is normal and correct and I should learn to keep my fingers clear:D
  18. bushtech

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

    R1 (2k2Ω 2W) really does get very hot, hot enough to burn a finger. Does this give a clue pointing to a problem?
  19. bushtech

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

    I am checking whatever I can while I wait for the parts to arrive for the replacement of the original banggood parts
  20. bushtech

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

    Still hunting for problems Checking RV3 (100k pot) It reads from 0Ω to 30kΩ. Keep in mind that it's one leg is attached directly to one leg of R18 but I have attached probe between resistor and pot.
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