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  1. bushtech

    Magnifying light voltages

    Hi Bertus Does look like 220J to me. Martin, please can you have a look at C4 for me
  2. bushtech

    Magnifying light voltages

    Thanks Martin Lifted a leg of R1 and measured about 510k. Measured both R1 and R2 in circuit and got about the same. But why do you get a 330 to 23 V change and I get a 315 to 137V change over R1. Trying to find this answer.Hence I want to measure its resistance in powered on circuit
  3. bushtech

    Magnifying light voltages

    Bertus Thank you so much for your help. I don't know where to go from here. I would still like to know if you can measure the resistance of a resistor while it is in a powered up circuit.I want to check R1 under load
  4. bushtech

    Magnifying light voltages

    I probably don't know how to read it
  5. bushtech

    Magnifying light voltages

    C5 202J 0.002uf ? D5 ? C4 220J C6 104J 0.00022uf C7 407J ? D6 & D7 FR107S
  6. bushtech

    Magnifying light voltages

    Thanks Let me see
  7. bushtech

    Magnifying light voltages

    Oh and R4 was actually R3 and the new R4 is to the right and below Q1
  8. bushtech

    Magnifying light voltages

    Apologies Sir Bertus. Fortunate that I did not take up electronics as a profession:eek: I hope this works now
  9. bushtech

    Magnifying light voltages

    Bertus Thats fantastic But I'm battling to ID the components with any certainty. I have done some updating on this layout. Please can you number the components on your layout as per this sheet. I have highlighted the component numbers I cant ID D5 but it reads 510 in diode mode My apologies
  10. bushtech

    Magnifying light voltages

    Can you measure a resistors resistance while it is in a powered up circuit?
  11. bushtech

    Magnifying light voltages

    Thanks Bertus What I am trying to get around is R1 I assume is there to drop the voltage from 330 V to 23V. In my case it drops the voltage to 137V. So my reasoning says my R1's resistance is too low. But measuring it in circuit it measures about 500k. So why is it not dropping the voltage.Or...
  12. bushtech

    Magnifying light voltages

    On closer investigation green/brown/yellow so 0.51MΩ
  13. bushtech

    Magnifying light voltages

    Thanks a mil Martin That helps a lot. So R1 could be a problem. Colours green/brown/white and gold. That gives me 51MΩ. Correct? Pretty sure I don't have that in my stash.My one dmm reads 10MΩ but got nothing else to corroberate with
  14. bushtech

    Magnifying light voltages

    Great Martin. Really appreciate your help
  15. bushtech

    Magnifying light voltages

    Thanks Bertus. Interesting. The diopter is 125mm dia. They have a 5" one there but no way to guarantee that it will fit. The fit is quite restricted. Before I take that chance I'll rather build something with a bunch of led's
  16. bushtech

    Magnifying light voltages

    Hi Martin Please when you get a chance can you have a look at the voltages on both sides of these components. This is where the voltages change. R1 D5 C5 R2 With tube removed. And in relation to neg. leg of C2 Thank you Dries
  17. bushtech

    Magnifying light voltages

    Thanks Bluejets. Yes I am familiar with those fluoro leds. Busy systematically replacing the fluoros in my workshop with them. The trick will be finding a circular one.Only if someone has started making a replacement. It will probably be easier getting some 220 V COB leds and soldering them up...
  18. bushtech

    Magnifying light voltages

    I hope this is easier. The red figures are voltages in relation to neg of big cap. I haven't had time to analyse this
  19. bushtech

    Magnifying light voltages

    Thanks Martin Busy redrawing this whole lot so we can see whats going on
  20. bushtech

    Magnifying light voltages

    Big thanks to Martin and Bertus As I see it this is the situation: Q1 Dries Martin B 0 3.7 C 138 330 E 0 7 Q2 Dries Martin B 138 0 C 315 315 E 138 0 Hmm. Now to figure this lot outo_O...
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