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  1. (*steve*)

    Can a low side driver control three N-type MOSFETs connected in series?

    When I used the term shenanigans in a previous post, I actually meant an 8 letter word starting with "bulls" and ending with "hit". And by now I think we'll all agree this thread has gone on long enough.
  2. (*steve*)

    Seal acid battery equivalent lithium

    You would be looking for an 11.1V 8Ah lipo battery. This will have 3 lipo cells in series. Remember that a balancing charger designed for lipo batteries will be required. You may be able to get away with a lower capacity battery because more of the capacity of a lipo battery is available than...
  3. (*steve*)

    about cable gauge

    I would use a 16V capacitor with a capacitance between 2200uF and 4700uF. Higher voltage or higher capacitance would also be ok. Capacitors of this size are polarised, so be sure to connect then the correct way around.
  4. (*steve*)

    PSU Clicking

    If the device completed a power up sequence, then the power supply must be basically working (when switch mode power supplies are grossly overloaded they can produce a clicking sound, but this also results in a zero or near zero output voltage). If you can open the unit up and take a few...
  5. (*steve*)

    One of my colleagues...

    I have the full set of three laminators. The middle one was the one featured in the last post. The one at the rear is the earliest prototype I have, made in June/July 2016. The other two are dated September 2016, so Ross clearly had a busy September! I am fairly sure that the one I...
  6. (*steve*)

    about cable gauge

    In that case, you could consider regulation closer to the load. At the very least I would place some capacitors across the supply rails at the load.
  7. (*steve*)

    about cable gauge

    And using a constant current driver (assuming the load will always be 5A) will mean you don't need to worry about the resistance of the wires (for sensible amounts of resistance).
  8. (*steve*)

    Identify this component... Code 33x1

    I can't find a reference to 33X1, however the device is clearly an op-amp (or something with the same set of inputs and outputs). It is not a comparator because there is no pull-up on the output. I concur with @ramussons
  9. (*steve*)

    Can a low side driver control three N-type MOSFETs connected in series?

    We were all reading that, and that's why we kept asking for a schematic to see what the hell you meant. If you weren't such a nice fellow I'd call shenanigans on you (and we'd all come out with our brooms). We would be very pleased if you can post a link to that information. It might reveal a...
  10. (*steve*)

    One of my colleagues...

    PCB Resist Laminator I believe I've mentioned that Ross developed his own means of applying photoresist film onto his large supply of PCB. This is one of the machines he created: This device consists of a pair of heated rollers that apply the film onto the clean PCB. The PCB is fed from...
  11. (*steve*)

    One of my colleagues...

    I just realised I have another couple of Ross' illuminated headsets. These use larger 18650 cells rather than 14500 cells. In addition these circuits also allow you to monitor the state of charge of the cells individually. And of course, they have instructions! Here they are in...
  12. (*steve*)

    One of my colleagues...

    However, the zener is in inverse parallel with the BE junction. Thus the reverse voltage can't rise above 0.6V. Why use a zener?
  13. (*steve*)

    Can a low side driver control three N-type MOSFETs connected in series?

    I agree. A schematic perhaps? I still really have no idea what you're on about.
  14. (*steve*)

    HIC Identifying Component

    It appears to be a microphone. The marking on the board is "mic". The images are not good enough for me to be sure. Increased brightness would be good.
  15. (*steve*)

    CQS and CRI

    See here
  16. (*steve*)

    Simple current question.

    Post the schematic. All that might be needed is a change in the value of another resistor.
  17. (*steve*)

    Car power to constant current 3.6A 50v boost converter

    No, it's fine. I have it memorised to 50 decimal places (the things you do at school!) and he seems to have it correct. The rounding is correct too because the next digits are (from memory) 0288419796939937511 For my next trick I will use that to calculate the volume of the observable...
  18. (*steve*)

    One of my colleagues...

    There were a few things that Ross had in almost every room of his house. A hacksaw, a magnifier, and a magnified headset. Here is an example of one of his headsets. It's a normal headset sold by the electronics shops here. They originally had a an incandescent torch bulb powered by a pair...
  19. (*steve*)

    Create controlled 50v pulse

    I can recommend the Canon 100mm macro lens. You get a good working distance, and the image stabilization is amazing.
  20. (*steve*)

    Create controlled 50v pulse

    @CommanderLake, It's an old thread, but you may be interested in this.
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