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  1. ante1

    Help me in Building a UPS

    Hi, You have to give some more info of what you are powering from this UPS. A standard SMPS PC PSU will have no problems with the voltage drop, some works from 96 to 275VAC. But it’s perhaps not a PC you like to run from the UPS. It might also be a problem caused by bad choice of battery types...
  2. ante1

    power trouble

    Hi helio, For every step you lose energy, this is not the way to go. I would recommend only one step conversion to get the highest possible efficiency. Use two smaller (half the size of the car battery) 12 V deep cycle batterys in series (24 V) and buy a new PSU for the PC. Here is one example...
  3. ante1

    De-soldering

    Hi monster, It’s a “Heat gun” or “Hot air gun”, very useful! Try to find one that comes with a small nozzle (like the picture). From a website: “Heat guns have many uses in industry. Heat guns are commonly used in electronics for shrinking "heat shrink" insulation tubing and tapes, drying out...
  4. ante1

    Strange behaviour of 78xx reg.

    Hi Tony, The capacitor at the input prevents oscillation but the one at the output is supposed to take care of load variations. Both of these must be connected close to the regulator or they will be less efficient or useless. If you still have problems with oscillation try to add a 0.33u...
  5. ante1

    Hey all. New member ere. A little help please??

    “so they make some sense”, yeah it really does now doesn’t it?  ???
  6. ante1

    Amplitude Modulation

    premece ! Try to be humble, then you might get proper help. Post your design and we all have a look at it to help you make it a good one.
  7. ante1

    Diode Limiters

    Homework?  ;)
  8. ante1

    Is this funny?

    Booby trapped with fire crackers or someone put all the electrolytics the wrong way! ;D
  9. ante1

    De-soldering

    The best way I have tried so far is this!
  10. ante1

    transistor markings/replacment

    I am sorry but it’s very hard to identify your component from such a vague description. A way to try is if you have a digital camera with a macro lens you could post some pictures.
  11. ante1

    NiMH Battery Pack Charger

    If you use anything from 11 to 14 Volts you’ll be fine since the circuit controls the current to your pack. If you go higher Q1 will dissipate more heat and if you go lower the circuit will at some point lose regulation. If you go for a uP you just need Q1 and a few resistors and not the rest...
  12. ante1

    transistor markings/replacment

    The 2SJ174 has a TO220 case. 2SJ174.pdf
  13. ante1

    0 ohm resistors

    Hi logan, The machines which put together the pcb:s can recognize a dummy resistor but not a piece of bare wire. 
  14. ante1

    Infrared diode and motor

    Yeah, sure  ???
  15. ante1

    NiMH Battery Pack Charger

    Oh, I forgot; the input at R5 I made for extra safety. If you like you can put a thermal switch (NO closing @45C) connected between the positive rail and R5 and put it on your pack. In case of a faulty pack or something else going wrong the T-switch will shutdown the charging process only...
  16. ante1

    NiMH Battery Pack Charger

    Hi CPW, This is peak detect charger I built many years ago, it has adjustable current up to 5 or 6A. You can feed it with 10 – 16 VDC (I used it on the car starter battery) depending on how many cells you are going to charge. Remember to put Q1 on a good heatsink and set the desired current...
  17. ante1

    Hey all. New member ere. A little help please??

    Dejavue !
  18. ante1

    Domotics

    Hi Staigen, Domotics is applied Information and Communication Technologies for more Comfort and Convenience in and around the Home! http://www.domotics.com/ http://en.wikipedia.org/wiki/Domotics ;D
  19. ante1

    Hey all. New member ere. Little help please??

    Hi sinn, How do you know that it’s glowing inside the engine? Have you checked if there are any potential between the two ends when the coil is heated?
  20. ante1

    Domotics

    Hi novoid, Here’s some links for you to browse through, I hope it helps. http://home-automation.org/Security_Systems/ http://www.automatedhome.co.uk/ http://c.webring.com/hub?ring=homeauto
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