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  1. S

    I have been thinking

    Hi all of you I have been thinking for a while, cant we(at least those of us that are active) go together and construct some instrumentation and other stuff, make them good, discuss them together, and upload them as projects here on this site? For example you, Audioguru, have a good tone...
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    230V AC to 12V DC @90 AMP

    Hey madame Have you checked out how they do it in computer PSU:s( AT, ATX ) ? BTW, steel plates for the core? Will that work? And dont it seems to be a very big core? //Staigen
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    help me!,how ican control 255 Relays.

    Hi ArabicEdison You can control up to 256 relays, and with a little clever thinking you can control as many relays you want! Try this: http://www.kemo-electronic.com Choose the english version(i hope you understand english)! ;D Observe! They dont sell to private persons! We can try ;D
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    8 way relay board

    Hi there ArabicEdison If you click on the "home" button you can change to an english version of the site( i hope you understand the english language) ! ;D //Staigen
  5. S

    Low drop out voltage regulator with TL431 Problem!

    Oscillating? Check with your scope! A cap on the output wouldn't hurt! //Staigen
  6. S

    Low drop out voltage regulator with TL431 Problem!

    Hey Shahriar, where is the base-emitter resistor for the 2N4403 transistor, it must be one for cirquits like this ;D //Staigen
  7. S

    Need help

    Hi If the line is horizontal then it is the frame output that is at error! Alkv23, is the line horizontal or vertical? //Staigen
  8. S

    Bass/Treble System

    Hey Mukhalled, you must use AC to measure the impedance. In this case you also must use several freqs to get a usable measurement, say at 100 Hz, 200 Hz, 400 Hz, 800 Hz and so on, but i would not do it that way, i would have used 3 or 5 amps, one for the subwofer and the others for the other...
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    Bass/Treble System

    Ok, go ahead! :) //Staigen
  10. S

    Bass/Treble System

    Hi Mukhalled, how did you measured the impedance of the speakers? Audioguru, dont you think the amp #2 is going to be slant loaded by the subwoofer speaker? There is speakers with 2 voicecoils, specially made for this purpose. The right way to do it, i belive, is to use one amp for the...
  11. S

    Bass/Treble System

    Hi Ok, that amp is bridged, what is the impedance of your speakers, and do they have crossovers buildt in? //Staigen
  12. S

    Bass/Treble System

    Hi Mukhalled Is the amps bridged? And do you have crossovers connected to the speakers? //Staigen
  13. S

    Power Line Commucation Help Find Info

    Hi Glen
  14. S

    Tracks Shape in RF PCBs are like two comb!

    Ok, then it is a cap :) //Staigen
  15. S

    Tracks Shape in RF PCBs are like two comb!

    Hi Of course i mean the TV Antenna mixer PCB, i hope the PC motherboard dont have something to do with your Antenna Board! ;D //Staigen
  16. S

    help me with this computation

    Hey Audioguru, take a look at the first one you linked to, what is the 555 doing there? Also look at the resistor divider, isnt that one backwards? And, why 74193? A 40193 is the same, and cmos! There are many moore errors there! /Staigen
  17. S

    BJT biasing formulas

    Hehe, yeah, the BC548 wasn't born at 1965, but i belive BC108 was(BC107, BC108, BC109) //Staigen
  18. S

    Tracks Shape in RF PCBs are like two comb!

    Hi Shahriar I dont think so, i belive it is some kind of tuning cap or impedance matching, what is it on the other side of the PCB? //Staigen
  19. S

    BJT biasing formulas

    Hey Audioguru, did you use BC548C 40 years ago? //Staigen
  20. S

    Power Line Commucation Help Find Info

    Hi Glen :) Did you? I tried to YAHOO it and got 62000 hits, but of course, i spelled communication right ;D But i did know how household slow data communications worked already :). Its like this, usally. A high frequency is superinposed on the AC line. This frequency is usally in the range 40...
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