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Recent content by quioxz

  1. Q

    Switching circuit

    Thanks a lot :) So if I just ignore the blinking? Will that damage the LED? Going to try a boost regulator soon...
  2. Q

    Switching circuit

    Ok, I got my hands on a pretty good bench I tried it on another brand of mobile powering with a AC/DC converter at 9V 2A+7805 The quiescent is about 5mA and the current measured at the adapter and the 7805's input leg is approx 350mA, the LED is OK With the same settings, I changed power source...
  3. Q

    Switching circuit

    Does 'disconnects the charging' means open the circuit? So you mean the cell voltage increases to 4.2V in a blink of an eye and then drops down in another blink of an eye and repeat? My LED just goes on and off very rapidly
  4. Q

    Switching circuit

    Hai! I'm back to annoy you guys again, so please bare with me a bit Imaging a normal AC-DC wall plug that labels the output 12V 500mA What does that means? Does it mean it will output constant 12V and current varies by resistance Or constant 500mA and voltage varies by resistance? What if I hook...
  5. Q

    Switching circuit

    Well,.... I suppose you are right Thanks for all the help, it has been really nice :) I'll have to get by myself from now :D Thanks all
  6. Q

    Switching circuit

    I only find that 500mAh is for regular disposable (umm, isn't all types disposable?) ones And yes, the size is a real constraint, I've been thinking of how I'd actually put things in Breadboard seem to be an option for arranging things but for the battery.... I don't know Maybe I'll really have...
  7. Q

    Switching circuit

    'Mid way between Beijing and the the Ronne Ice Shelf' on a straight line down, it would be .......... Australia :D I'm from Thailand Btw, I'm not buying from local stores..... it's digital store :) So, no chance to check The PCB (for making anything), I want to make one myself too, if I can...
  8. Q

    Switching circuit

    I actually going to buy one that is premade, it's about $3-4 I already found the datasheet with the design for 5V output I'd like to make one myself, but... I'm not planing to make a PCB, all the stuff are soldered and glued (if require), the box doesn't conduct electricity, but even though I...
  9. Q

    Switching circuit

    55pilot: Actually, I mean when the power runs low unexpectedly and I need it running for the rest of the day before I get back to my wall charger Normal use will be wall charge anyway On the other hand, I'm doing this educationally too, lol, as I love experiencing stuff So I may not have to...
  10. Q

    Switching circuit

    I typed too slow then :P Age + background : high schooler The other question, I believe has been answered in the previous post And your presumption is probably correct :) I'm not going to make up anything that exceeds my capability or dangerous anyway so if the DC/DC converter is too much then...
  11. Q

    Switching circuit

    55pilot: Internet surely is confusing, -sigh- Ok, so are you saying that putting rechargeable batts in a flashlight that requires 2 AA is scary?? Assuming they are both fully charged (or equally charged) What's a 'ripple voltage', ESR? Please explain to someone that English isn't his native :)...
  12. Q

    Switching circuit

    So I've been looking for a nice tool and found Multisim :) Here's the current diagram with 9V+7805 For the box, it's just a small aluminium medicine box I found that looks nice Btw, if I understand correctly, 7805 is a buck regulator right? And if you were to use the higher voltage, what is...
  13. Q

    Switching circuit

    Suppose I say the device draws constant 500mA, not taking into calculation the power required for LM393, LED, pull ups, etc. A 9V battery with 500mAh would be dead in 1 hour (assuming no voltage drop and the regulator works all the way through, which wouldn't happen) For 3 recharge able cell...
  14. Q

    Switching circuit

    Haha, well, regular 9V holds about 400-500mAh regular alkaline AA battery range from roughly 1500-3000mAh. It's a huge different :) I didn't mention the power source because I wasn't able to decide what to use.. I could have gone with some bigger batteries(3.7V LiPoly?) in series and use...
  15. Q

    Switching circuit

    Actually, I was thinking of 2AAs + step up converter or sort of that The quiescent would probably be lower than 1mA too and my power would be pretty much limited
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