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  1. SM2GXN

    dipole antenna formula

    150/Freq(MHz)=Dipole length in meters I would say that quarter wave dipoles are very very rare.
  2. SM2GXN

    Great Free Book -

    Hi Cryonic! Couldn't have said all that better, I've built receivers, transmitters rf-amplifiers guitar amps with tubes, few things give such a pleasure as looking into a glowing tube if lucky some blue colour slips out from the holes in the plate and they even smell good
  3. SM2GXN

    VHF AMPLIFIER (PLZ ANSWER)

    If your wish is to start by building an RF-amp check the attached PDF-file VHF-UHF_Amp.pdf
  4. SM2GXN

    VHF AMPLIFIER (PLZ ANSWER)

    Hi sssaaa! As Staigen correctly stated, a good antenna for the band to cover is the best way to start. A good advice is, make som kind of rotatable antenna and add an RF-amp for weak signals that is just above the noise level.
  5. SM2GXN

    DIODE QUESTION

    Hi Um...Me123! If the current consumed by the load not exceed 1A you can chooose any of 1N4001-1N4007
  6. SM2GXN

    Online eBook

    What's cloggies? Some electronic device? Ante will cloggies fit into that kind of climate we got in northern Sweden?  ;D I've found the programmer when I was cleaning my lab I'll post it on monday with printer port cable and a dil-socket, finally!!
  7. SM2GXN

    Bridge Amplifier

    Hi Mukhalled! Here's a PDF-file I had on my hdd "AUDIO AMPLIFIER ICS DESIGNER AUDIOIC.pdf
  8. SM2GXN

    Capacitor Voltage

    Hi shaiqbashir! For your first question, the voltage rating given for a capacitor 16V/1000uf means that its maximum working voltage is 16V which you shouldn't exceed, they may withstand higher voltages than the one marked on the capacitor for a shorter period of time but it is always best to...
  9. SM2GXN

    220V to 110V

    Hi Felto! Can you take a picture of what you think is a transformer, it would help a lot. If there is a motor inside running at AC the load wont be purely resistive either, we have to take into account or?  ::)
  10. SM2GXN

    Heater blanket

    ;D ;D Honestly I liked the old "S" marking better, this CE and all the other labels they put on all electronic devices means nothing to me, you don't know if they just have a big pile of labels in a box and when they think it's ok they just put on theirs product, not to talk about EMC it's a big...
  11. SM2GXN

    Heater blanket

    Hi Ante! Well it's -2 to here so it's time to switch on the A/C  ;D I don't think so it might have got in to Sweden by the "unknown black freighter"  ;D I don't remember but not much current passes through those switches, maybe 2-3 amps (as you were guessing) I was more worried about the...
  12. SM2GXN

    Heater blanket

    Hi! Here's some thoughts :) My curiosity lead me to open a rubber block containing the thermostat on a heater blanket that didn't work well, the blanket which is made of rubber is used to warm up a R134a refrigerant tube for car A/C in order to speed up the refrigerant R134 transfer from the...
  13. SM2GXN

    6V LED Chaser Question

    Yeah Ante that's true hams like to solder on the copper side. During the etching you discover that you've forgot to mirror the layout so what does it men? All components on the copper side  ;D
  14. SM2GXN

    SMD Codes

    Here's some pdf files containing marking codes for SMD,s and some hints. Found them while cleaning up my HDD  ::) SMD_Codes.zip
  15. SM2GXN

    Problem Connecting to Site

    Thank's to Staigen and some dirty detecive work  8) we solved the problem with the login problem, without Staigen I wouldn't have solved it. He is a real hacker  ;D
  16. SM2GXN

    caps

    Hi mettula! A shematic is always a great help and amplifiers with two equal channels is also a great help when you are into fault finding cause you can compare the signals by following it's way through the two channels. 100hz in your sub amp sounds like a bad filtering or that something have...
  17. SM2GXN

    vehicle rpm based switch- help

    Hi pilottx! Interesting project, in another thread there is a discussion about a RPM counter using single IC LM2917, inside the IC there is a comparator which can be set to trigger at 3000 rpm (if I undeerstood the data sheet right) and activate the air valve. Let's see what the output of your...
  18. SM2GXN

    Nokia 446 XS 19" Monitor

    Hi Ante! What is the problem?
  19. SM2GXN

    My Lab

    Hi alkv23 ! Nice lab you got there, a clean bench is what I always wanted to have to
  20. SM2GXN

    Camcorder viewfinder

    Simple and useful circuit. Last winter I started a project to make a camera for winter fishing  ;D the idea was that the camera could be dropped down in water under the ice to see when fishes approached the bait but it's still a project  ::)
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