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  1. flippineck

    Gas meter plug?

    Had a google for you, couldn't see a pattern that matched anywhere though.. closest I found was a molex 5557 which looks similar but not a perfect match.. will try again if you post more info (any details on the gas meter itself?)
  2. flippineck

    New LTSPICE Version XVII

    Have read about LTSPICE many times on the forums but have never tried it. Well now I have, thanks for the headsup. Installed and ran flawlessly from what I can tell on my machine, which is not the newest (64 bit Windows 7 Home Premium on intel core i5 @ 2.5GHz with 6GB RAM) I haven't a clue how...
  3. flippineck

    impose current ceiling

    Thanks will do. I was ok at physics at school but my maths sucked. Dug it up & bookmarked it, probably take me a while to get to grips with it.
  4. flippineck

    impose current ceiling

    Got rid of the motor & replaced it with twelve 20W 12V halogen lamps wired up as six series pairs in parallel. I figure this works out as a decent resistive load for 10A at 24V, as something to approximate the battery on charge on the other side of the charge controller, bearing in mind the...
  5. flippineck

    impose current ceiling

    PSU came in the post :) needed one of these for years. Attached a small dc brushed motor as a load (despite wondering if that might be a bit silly because of back EMF / inductive issues) - threw caution to the wind in impatience & powered up Worked beautifully! Each 2R2 sense resistor seemed...
  6. flippineck

    Alternatives to lead acid in the hundreds of Ah

    I'm using lead-acid 12V batteries, 'deep cycle' type, 110Ah each for storing solar power. My two batteries are now somewhat degraded through use, disuse and abuse & I was thinking it's probably time to replace them. This is the type I have...
  7. flippineck

    RE-Maplin Electronics in the USA.

    Cricklewood Components - didn't they used to advertise in ETI magazine. Deffo heard of them, never used them
  8. flippineck

    impose current ceiling

    It's all a balancing act between collecting as much power as possible in the conventional sense, and collecting at least a useable amount of power on the usual cloudy days - which necessitates a fairly large number of panels all contributing various small trickles of current. I think it's quite...
  9. flippineck

    RE-Maplin Electronics in the USA.

    I was in Maplin's Blackpool UK store just the other day looking for a shopping list of specific parts. At first the range on offer seemed pretty poor - need one 10k resistor? Here, have an expensive bag of 1000 randoms which may or may not contain the one part you need sort of thing. Ask a...
  10. flippineck

    impose current ceiling

    Thanks. Found some further guidance on that point here: http://www.electro-tech-online.com/threads/breadboards-maximum-current.9597/ If I can get it to work for a few seconds in the single digit amps on the breadboard, I'll most likely rapidly go and get some ferric chloride & a pen & maybe...
  11. flippineck

    impose current ceiling

    just waiting for the power supply and the meters
  12. flippineck

    impose current ceiling

    No. I was just going to take a sledgehammer approach of having the MOSFET bolted with computer heatsink goo, to a great big lump of copper, with flying leads to the prototyping board to begin with. I've kept longish legs on all the 2R2's and have them spaced out a bit on the prototyping board...
  13. flippineck

    impose current ceiling

    Thanks Steve. I've got a 0-30V analog voltmeter, a 0-15A analog ammeter, and a new variable bench power supply 10A/30V on the way as well, figured I'd need those to actually feed it & see what's going on.
  14. flippineck

    impose current ceiling

    Ok got most of the bits now, am building it on a prototyping board to begin with. Only part I haven't been able to get hold of is a suitable mosfet - maplin store down the road only had 2N7000 in a TO92 case and the current handling capacity looks a bit low, IIRC it was only 2 or 3 hundred...
  15. flippineck

    impose current ceiling

    'at maximum dissipation' - that's the bit of the jigsaw I was missing I think. Thanks! Sun's doing it's random max shining thing at the moment, just blew a bunch of 5A fuses in a row and the battery's flat because of the non-auto recovery nature of fuses. This means I'm reliant on Noisy Diesel...
  16. flippineck

    Flyback Transformer

    Do you have the make / model no. ?
  17. flippineck

    Huawei B593s-22 WiFi Modification

    Attached image is the circuit board of my router. The two SMA connectors at the top of the board, one on either side, are for the cellphone antennas (it's a mobile 4g router). The router has WiFi capability, but no external WiFi antenna port. I can see two small signal connectors bottom right...
  18. flippineck

    impose current ceiling

    Thanks for the help understanding it - more confident to pick parts and build it now :-) I think I get pretty much the full operation of the circuit now, just a bit confused about what you mean regarding R1's constant voltage & it's individual multiple elements always dissipating the same...
  19. flippineck

    impose current ceiling

    So.. I think I have some kind of understanding but it's probably very flawed.. As the current rises, the base potential of Q2 rises. At a certain point the rising potential at Q2's base causes sufficient base-emitter current to flow, to switch Q2 toward conduction. When this happens, the...
  20. flippineck

    impose current ceiling

    I *think* I'm beginning to get how the circuit works - not sure about the zener diode though, how does it protect the gate of the mosfet.. with a 10k resistor upstream of it, where does the danger of 10V come from?
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