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  1. C

    Clean square waves using a 555 timer?

    Try this one with a 1k resistor on the output pin3 to ground..
  2. C

    Clean square waves using a 555 timer?

    Xeno, one other thing, it's not 50% duty cycle, for that you require a diode, on Android look for electrodroid to do the calculation for you...
  3. C

    Clean square waves using a 555 timer?

    It's a nasty chip, no more than a swiss army knife is nasty, in an emergency they both could potentially save your life....
  4. C

    Stability of voltage regulators

    However, we're talking about a linear reg, if that starts outputing > 15v something failed in which case the capacitor is least of your worries...
  5. C

    Question about Li-ion batteries

    I've been able to pull 20/ah from the cheapest of lithium batteries probably up to 100a/h from a good 18650 battery from samsung/sony/panasonic etc The ebay ones that claim 9000mah is total bs, maybe just maybe 800 - 1200 for anything less than $10 US
  6. C

    Stability of voltage regulators

    Look, if this is powering a $$$ system then sure, a 19 - 24v is better than 16v but i kinda presumed it's not... As for professionals, absolutely they do, the amount of caps from samsung, acer who use 22v caps on 20v so many it's not funny and then i agree with you completely ... But is this a...
  7. C

    Stability of voltage regulators

    Why not? 16v cap is fine for a 15v supply... it's done all the time, will it last as long? Prob not but that was not the question
  8. C

    Stability of voltage regulators

    If it's a linear, it will only output 15v max so it's safe, just keep an eye on the cap make sure it's not getting too warm I have a 16v on a 19v feed (but with a constant load most of the time lol) works fine
  9. C

    Question about Li-ion batteries

    No wonder they never get the milage claimed!
  10. C

    Compact AA voltage booster

    I desolder the usb connectors and attach my own aa battery holder...
  11. C

    Power supply noisy inductor

    With those kinds of voltages and current, it could have damaged more than the caps..
  12. C

    Can anyone identify this component

    Looks like part of this family ....
  13. C

    Compact AA voltage booster

    Like these then?
  14. C

    How To Annoy Those Helping You Out

    I guess, inexperience plays a big role, if you know what you want but nothing about it.... Yes Mr Mechanic, it makes a clunk noise when i go round the corner, but i suppose it's to the point, and that is the point
  15. C

    How To Annoy Those Helping You Out

    LOL - i hope (at least think) you never took my question seriously
  16. C

    Touch switch for heating element

    As to vary the current, the switches would have to talk to a micro and then adjust the pwm to the triac...
  17. C

    Touch switch for heating element

    What's it currently using? A switch? chances are the switch is not carrying the current it merely switches on a triac ir relay and that carries the high voltage/current If so then yes, a capacitive button could trigger it...
  18. C

    How To Annoy Those Helping You Out

    Is it possible to limit the max post to say 100 words lol After going to the supermarket and stopping by at jaycar to go through all their kits i decided to ebay them instead but before i could i got side tracked with a guy dressed like a clown who just walked into the shop, the clown reminded...
  19. C

    Craig's battery saver for Android!

    Last couple of days i've been working with boot receivers, in windows what you place in startup folder (or registry) gets run on boot.. On Android a similar thing happens, i ise AutoStarts to disable apps from running on boot, but you have to individually select each app and disable it.. I...
  20. C

    Simple theremin 555 timer

    http://seventransistorlabs.com/Theremin/ Looks like a good resource, i'll be reading that later on myself!
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