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  1. Sunnysky

    Led's headlight issue

    Try the smallest 12V bulb that works with fault light out e.g 3W and measure its resistance. If you want a resistor instead. search here...
  2. Sunnysky

    Flip or mirror a Sony Trinitron

    rotate yoke
  3. Sunnysky

    Amp In Protection Mode

    when Q607 Vce =Vbe=0.7 then Q605 becomes Vce=0 Q605 reads 44.1 V ==>E 44.1 V ==>C 43.4 V ==>B EDIT **** Q607 Vce=0.7 = Vbe therefore Q605 Vce=0 *** Q607 reads 43.4 V ==>E 44.1 V ==>C 44.1 V ==>B Since the feedback point on input is inverted a positive output offset has to be caused and a...
  4. Sunnysky

    need help on clock D flip flops table

  5. Sunnysky

    Led's headlight issue

    Instrument panel will have some threshold current sense to detect faulty halogen filament. Thus a dummy load current perhaps 1 A is needed or 14W. This is Trial and error to determine lamp fault threshold indicator on instrument panel.
  6. Sunnysky

    Amp In Protection Mode

    When the loop feedback R was changed to 0V feedback instead of high offset out, Q603 reads 00.2 V ==>C 00.8 V ==>B 43.4 V ==>E Vbe of Q603 ib is low (0.6 vs 0.65) and thus Ic is low and thus Q605 Ib is low and thus Q605 Vce =0 Normally Q603 Vb=1.5V with loop closed. make sense? thus Q603 is...
  7. Sunnysky

    Amp In Protection Mode

    when Ibe is low Vbe = Vcb when it becomes forward biased thus Vce = 0 , this is normal for some low Vse(sat) transistors.
  8. Sunnysky

    Signal is periodic or aperiodic

    periodic. since t is not limited.
  9. Sunnysky

    Replacing 3.7 lithium ion battery supply with permanent 3.7v power source

    The android should have a useful charger which can support a weak battery.
  10. Sunnysky

    Amp In Protection Mode

    Leakage on Vce is very much voltage dependant. thus DMM readings may not indicate. Q603 NPN normally has high Vce , while Q605 PNP is low Vce. Therefore voltage at Q603 , Q601 junction is far more sensitive to Q603 on output bias error. The offset adjust pot is thus designed to null this offset...
  11. Sunnysky

    Obscure high power electronic device,what is it?

    a transformer and your doubler circuit https://en.m.wikipedia.org/wiki/File:Greinacher_circuit.svg
  12. Sunnysky

    Question about PTC fuses

    it doesn't get any simpler
  13. Sunnysky

    switching a relay - but on second switch. ( if that makes sense? )

    It seems your smoke gen, already uses dual momentary coil latching inputs. But to make this reliable each stroke must produce only 1 pulse, although bounce is expected for ~1 ms, a carefully chosen cap that wont burn out the contacts yet discharge the cap to sustain the pulse and then charge up...
  14. Sunnysky

    switching a relay - but on second switch. ( if that makes sense? )

    so fix my timing diagram if you have 2 outputs and 2 inputs.
  15. Sunnysky

    Question about PTC fuses

    it is intended for occasional stalls not as a routine function. they do age.
  16. Sunnysky

    Question about PTC fuses

    Rmin also may reduce starting torque, but your DCR must be 1.2 Ohms so 0.3 Ohms is not too much loss in start torque., just a slower start. whereas a 1.5Ohm PTC may be too high it may also affect max RPM with voltage drop. This depends on motor stiction and load. I would suggest 350mA SMD for...
  17. Sunnysky

    Question about PTC fuses

    inbetween depends on history, ambient temp and device temp. so like a fuse, it will take longer to trip or may not trip if only 600mA in between but it recovers when load current reduces. Best practice is free convection .
  18. Sunnysky

    78L33 regulator

    report full schematic . 5Vac is better perhaps needs bigger C anything get warm?
  19. Sunnysky

    One switch to rule them all

    DPST. Relay is the way to go. ratings depend on your specs.
  20. Sunnysky

    Help Identifying a Battery

    8x14 + 8x16. hmm https://en.m.wikipedia.org/wiki/List_of_battery_sizes see this 12 V alkaline made of 8 cells A27 GP27A MN27 L828 27A 8LR732 (alkaline) 22 (alkaline) 12V. 8 × 28mm...
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