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  1. flippineck

    impose current ceiling

    Thanks for that Steve. Going quiet while I spend some time looking at that circuit in detail, I'm very rusty so I'll be googling aplenty for a while. Does 0R220 mean 220 ohms or 0.220 ohms
  2. flippineck

    impose current ceiling

    The maximum voltage experienced by the current limiter, directly across it's inputs and as far as the input to the charge controller, at the moment, should only be between the three 80W panels maximum power voltage of 18.06V, and the 21.6 V open circuit voltage. The maximum potential current...
  3. flippineck

    impose current ceiling

    Could I use something along the lines of this http://www.radio-electronics.com/info/circuits/diode_current_limiter/power_supply_current_limiter.php ? Let's assume I incorporate a 15 amp fuse to provide a hard non-resettable safety limit to the current from the panels, but want to limit the...
  4. flippineck

    impose current ceiling

    Good idea. The lower power panels were the ones I bought earlier, the higher powered ones were bought a couple of years later. In the intervening years the output of the same physical size panel had risen, panels of the same size in the lower rating seemed to have become unavailable. Right now...
  5. flippineck

    impose current ceiling

    Still in the process of trying the bulbs. Blown a few, need to buy more :) Anyone any knowledge / experience of this sort of thing: https://en.wikipedia.org/wiki/Constant-current_diode (would this be as simple a solution as splicing one two-lead component into the solar panel feed line?) They...
  6. flippineck

    impose current ceiling

    Double post sorry, ran out of editing time. Just a quickie - I wondered if I could use a filament lamp as a current limiter? It would have to have quite a pronounced bend / knee to the IV curve to allow sufficiently free current below the threshold without much dissipation. I don't know if...
  7. flippineck

    impose current ceiling

    Looking at the characteristics graphs, that sort of thing looks ideal. I read down at the bottom of your link.. "The entire current-limiter circuit can be packaged and used as a three-terminal device (Fig. 5)." It'd sure be nice to find exactly such a pre-made current regulator / limiter in a...
  8. flippineck

    impose current ceiling

    Thanks guys I appreciate your attention on this. I still have the old melted mess of a charge controller in the shed (understandably the shop wasn't interested in a refund seeing as it was myself that messed up the maths) so I can dig up all the specs etc. My panels, on thinking about it, are a...
  9. flippineck

    impose current ceiling

    I have a supply connected to a load. The load is a constant purely resistive load. The supply voltage fluctuates fairly wildly and is capable of supplying a lot more current into the load, than the load is capable of surviving. I could add a fuse in series and that would impose a specific limit...
  10. flippineck

    Input to a microcontroller

    Having read so far, and no further, let me quote and reply: I properly lol'd :-) I'll continue reading.
  11. flippineck

    Input to a microcontroller

    Both. I looked up a 555 astable and counter - http://www.cheekytronics.com/Projects/12_bit_counter.html Tried plugging in some numbers & it looks like it'll be ideal for the immediate task. I'll use the highest four bits, from those I should be able to get 24h, 12h, 6h and 3h timings with a...
  12. flippineck

    Input to a microcontroller

    Accuracy isn't actually all that important - the main thing is that it does eventually drop out after a 'something like' while, to stop the continued use of heating when somebody leaves the property and forgets to turn the heating off. I guess I could label the pressbutton(s) 'creatively'...
  13. flippineck

    Input to a microcontroller

    I'm really split on this! I started out with the basic idea, and thought it would be a very simple matter to find a suitable readymade 240V timeout switch on ebay - turns out this doesn't seem to be the case. Even if I could find a switch that had a long enough time delay (I'd settle for a...
  14. flippineck

    Input to a microcontroller

    The overall project is to control a central heating system in the simplest and most basic manner possible. I'm a bit old and doddery lol so I'm not keen on complicated digital central heating programmers that I have to read the instruction manual for, everytime I want to change something. To...
  15. flippineck

    Input to a microcontroller

    How clever is that! Thanks for explaining. It's been worth it just to find that out.. but I think I'm going to stop trying to modify this timer, it's going to be easier to design and build a whole new board to make it do what I want. i.e. Time for 24 rather than 2 hours max. Looks like there's...
  16. flippineck

    Input to a microcontroller

    I'm messing around with a device here which incorporates a small one time programmable microcontroller. It's in a timeswitch, I posted about in the parts info subforum earlier: https://www.electronicspoint.com/threads/18-pin-dil-ic-sh69p-20c-1217-e-018du-n6sny-3-3.278876/ The micro has four 4...
  17. flippineck

    18 pin DIL IC SH69P 20C 1217.E 018DU N6SNY-3-3

    Top work, many thanks! Wondering what's going to be the easiest way to hack it into a 24 hour timer.. (20 would do) First vague thought is, could I sledgehammer it by simply slowing the clock down by a factor of 10? Would I have to reprogram it? Living in hope I can change the value of just...
  18. flippineck

    18 pin DIL IC SH69P 20C 1217.E 018DU N6SNY-3-3

    18 pin DIL IC SH69P 20C 1217.E 018DU N6SNY-3-3 Found inside touch-operated timeswitch. Looking for info? maybe this.. http://datasheet4u.com/datasheet-pdf/SinoWealth/SH69P20C/pdf.php?id=932009 http://www.dycmcu.com/data/upload/201402/081654408.pdf Any other info gratefully received. It's...
  19. flippineck

    USB Diverter

    I expect you probably want to do this yourself but I had a setup like that once - I used a readymade solution which handled the mouse and monitor as well, it was called a KVM switch. It had a foot pedal to switch between several towers. https://en.wikipedia.org/wiki/KVM_switch...
  20. flippineck

    One shot one day segment timer

    Sorry to double-post but been thinking about this.. Looking at the wiring for a Y-plan / 3 port valve heating system, I could accomplish what I want without changing or disturbing the two timeclocks currently fitted (one for hot water and one for central heating) The central heating timer just...
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