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  1. chromei386

    Car battery circuit design - comments, feedback?

    Thanks, I do think constant source of current to the battery would be very useful to charge the battery faster
  2. chromei386

    USB cellphone charger

    Feasibility study? They already make these
  3. chromei386

    digital x-ray

    Looks cool
  4. chromei386

    HELP

    You will need to be specific in what you are looking for What is the power (watts) requirements of the home appliances? Are they 110/240V AC appliances? Will you be supplementing from the grid or is it a standalone system?
  5. chromei386

    NiMH battery charger with BQ2002FPN IC Controller Fastcharge (8-DIP)

    I realise I was being a lazy bum. Here's something more specific I drew up. I think it will work!
  6. chromei386

    Free sample chips!

    Maxim gave me the shaft, but Texas Instruments sent as International Priority Mail.
  7. chromei386

    Simple sensor project?

    It may be easier to do it via a platform such as Arduino - http://www.arduino.cc/ - they have tutorials and sample code on hooking up sensors, adjusting sensitivity, sound makers, etc. Designing projects is costly, and can quickly consume time and resources. Remember all this requires testing...
  8. chromei386

    Help needed for photovoltaic systems

    Some key issues I see arising are: How many LEDs and what type will it take to provide adequate lighting (if these are for replacements for normal street lights).  What is the lighting requirement, is there any benchmark? What is the power drain? How will you store the energy  - SLA...
  9. chromei386

    Car battery circuit design - comments, feedback?

    I'm not sure what you're referring to?
  10. chromei386

    replace a laptop motherboard cmos battery

    Don't attempt to solder the battery if it is not designed to be soldered as it may damage the battery / leak / explode (?) Maybe buying a separate small battery holder instead would work?
  11. chromei386

    Best place to buy an air conditioner?

    I think you'd be pushing your luck asking for them to pay for an air conditioner. For buying one, check if someone is selling one via online classifieds - maybe one second hand- but quite new, i.e. they bought it 2 months ago and now are moving overseas, etc. And make sure you get good...
  12. chromei386

    Battery eliminator & charger, EICO model 1050

    What do you want the DC power supply to power? I'm not sure exactly of that model, but if you're doing using it to power sensitive electronics with ICs, etc, it would be better off with a stable regulated power supply. Maybe check if it's regulated..
  13. chromei386

    My IMAC doesn't recognise my Canon scanner. What can I do?

    I don't use Macs, but have you tried basic troubleshooting, such as trying different USB ports, checking cable connections, checking hardware devices. Maybe it just needs an updated driver from the Canon website.  Or even just Apple system updates
  14. chromei386

    Car battery circuit design - comments, feedback?

    Hi KevinIV, That is not how I intended it to operate. I don't really know what I'm talking about, but this is my idea behind the design: The 16V regulator comes from a computer PSU. The first voltage divider (20k/100k) acts as the Reference voltage - which is about 13.56V in real life - to...
  15. chromei386

    Car battery circuit design - comments, feedback?

    Oh I think I probably confused people with all the different diagrams. The battery is getting > 14V across the terminals when charging, as measured with multimeter as per the design, but the "supply voltage" comparison voltage for the voltage comparator is not getting above 12.8V. And in fact...
  16. chromei386

    Car battery circuit design - comments, feedback?

    A follow-up, I have soldered this to perf board, and hooked it all up but there's a problem... It charges at 700mA then gradually drops to say 500mA, but it never seems to get over 12.8V in the Vout at voltage divider at R8-R9. I can go up to 1100mA but I don't see it'll make a difference...
  17. chromei386

    NiMH battery charger with BQ2002FPN IC Controller Fastcharge (8-DIP)

    Hi, I would like to make a reliable NiMH battery charger - using the BQ2002FPN IC Controller Fastcharge (8-DIP) - datasheet here: http://www.chipcatalog.com/TI/BQ2002FPN.htm I was originally going to use a Maxim product but they decided they didn't find me important enough to send it to...
  18. chromei386

    Which bench power supply do you use?

    Which bench power supply do you use? What are its features / likes / dislikes? Please post a link if it's a project you built from schematics online I use a Dell computer power supply with +5v and +12v rails. It does the job, but I am looking for something more robust and adjustable with...
  19. chromei386

    Car battery circuit design - comments, feedback?

    Just in case anyone was following this, here's a pic of the prototype: It appears to functioning correctly. I have limited the current more than normal as I am using thin aligator cables. Oh and the power is coming from the 5V and -12V rail, which is giving about 16V. I tried tapping into...
  20. chromei386

    Converting ATX power supply into a bench supply - for electronics-lab?

    Hi, I am about to start a project of converting a 400W ATX power supply from computer into a bench supply. +12V, -12V, +5V, -5V, +3.3V, -3.3V connections I've done it before with a 150W PSU and I use it all the time. Do you think electronics-lab may want to add this article/project (with...
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