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  1. HellasTechn

    looking for some expertise..

    Can you link me to the original thread so i can see what it is all about ?
  2. HellasTechn

    220V solder iron under 110V

    Hi ! I have this silly quiestion. Most ships i work on have 110V-120V mains power (two supply lines of 60 volts 180 deg out of phase). I also have a solder iron that works on 220V and gives 40W. This solder iron is consisted of the heating element and a 1N4007 diode in series. If i remove the...
  3. HellasTechn

    looking for some expertise..

    He is indeed one of the best. a true VIP !
  4. HellasTechn

    SMD components question.

    Good day everyone ! Lately i had many problems with smd devices, my main issue is to identify them so i can measure them. To be more specific, all PCB's use theese SOT-23 smd devices. I have come across a large number of markings on them and honestly i find it very hard to identify them. Today...
  5. HellasTechn

    How can we Improve EP in 2017?

    I agree. Also one can use Primo PDF software to create PDF files of whatever he wants printed. For example i use Prmo PDF to make pdf files of the Soldermask layer of the PCB's i make through Express PCB software. When Primo PDF is installed then it is displayed as a printer and when you...
  6. HellasTechn

    How can we Improve EP in 2017?

    I am fine with this layout.
  7. HellasTechn

    How can we Improve EP in 2017?

    Not bad idea. ThankYou.
  8. HellasTechn

    GPS NMEA, Failover Circuit upgrade attempt.

    Good to know they actually work. I dont really care about wasting fuses but what is important to me is that in case of too much current draw, i will not need to open the device and replace the fuse. actually the datasheet is this one ...
  9. HellasTechn

    GPS NMEA, Failover Circuit upgrade attempt.

    Instead of using a standard fuse i think it will be better to use this ceramic self resettable fuses: http://www.ebay.com/itm/112181738896?ul_noapp=true I have read their datasheet and it says that they have an 80 ohm resistance so i guess i will have to remove that 20 ohm resistor i have put...
  10. HellasTechn

    How can we Improve EP in 2017?

    I wish to you happy 2017 ! One thing that just popped into my mind is to add PDF support. In other words to make our forum able to accept PDF. That would be usefull for reading device manuals for example. Thank you.
  11. HellasTechn

    DC Wall Adapter...

    That is certainly the best thing to do since you are playing with massive currents. You say you need 44 Amps while my house mains fuse is 35 Amps. can you imagine ? It is not that we dont want to help you but it is our duty to keep you at the safe side.
  12. HellasTechn

    Please Help Me Assemble 10m Remote Ultrasonic Compact Circuit

    Hi there. I see you have the circuit diagram. What exactly is there you need us to help you with ?
  13. HellasTechn

    Very Old Components I Can Not Identify.

    I beleave they are Milspec chips and probably intentionally marked like that in order not to be idintified. I guess, whoever the manufacturer is, must have or had a reference list for them. To be honest i dont even know how theese chips got to my possesion. My father had them in that box for...
  14. HellasTechn

    Very Old Components I Can Not Identify.

    Yes true. Yes that is also true. I have seen similar on us navy ships.
  15. HellasTechn

    Very Old Components I Can Not Identify.

    I am not sure. I will open a pack and check.
  16. HellasTechn

    Very Old Components I Can Not Identify.

    Happy New Year everyone ! After digging into a box filled with old stuff i came across many chips inside their original packing that i have no idea what they are or what they do. I have googled their markings and came up empty. I have even looked them up on e-bay but no luck there either. They...
  17. HellasTechn

    Merry Christmas

    Merry Cristmas to all !!! :)
  18. HellasTechn

    Need help repair Sunshine ATX psu

    I am sorry i was away for a long time. Let me read through the posts and see...
  19. HellasTechn

    How Radio wave are generated in FM?

    An FM (frequency modulation) signal is nothing more than a standard amplitude signal that it's frequency swings in accordance with the data to be transmitted. There is always a center frequency and the slight increase or decrease of this frequency is then converted in increase or decrease of...
  20. HellasTechn

    smart home innovations

    Welcome to our forum ! What you ask may very well not be possible for us to do. The system you want to create will definetly involve microcontrollers and too much programming. So ieven if someone provides you with a basic circuit design with some pic microcontroller how will you manage to write...
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