Recent content by johnc12

  1. J

    UPS Problem

    yes i wont... Ill place it on my archive for safety.... Soon when Ill be working on APC Ill be able to fix that problem... rar
  2. J

    Monitor Problem

    yes i tried it with my old motherboard and also with new ones... and the same problem  occurs... I still  haven't tried  to replace the mosfet... I think tomorrow and I will post here what happend....  :)
  3. J

    Question for Electrician about unsafe voltages

    I'm not a qualified electrician but supplying higher power to a camera like yours damages internal parts like IC especially sensitive chips that only needed a little supply in them... try what ante said... he's an expert on this. ;D but I think theres a little possibility that you could repair...
  4. J

    satellite speaker problem

    Aw... hehe... thanks for correcting me. I'll try to review my audio electronics basic :( I think the project is quite expensive and I think troublesome in my part. I've been studying Communication Electronics but when I shifted computer my focus turned into it. But I think I'll give it a try...
  5. J

    AudioGURU and others... help me!!!!

    I have seen that you've used 555 timer and this circuit is a basic up and down counter I believe. In my school we used atmel 2051 to design down and up counters, timers and etc. or combination. We also used a decoder 74ls47 in our design, but our project is kinda expensive because a we bought...
  6. J

    UPS Problem

    hehe. Ante, I tried to check the UPS using you're diagram but it shows only little similarity on the pcb. The mosfets, resistors and caps are hard to find and not the same as irf740. My supervisor and I decided to indicate the problem and declares the unit defective and will be replaced...
  7. J

    Monitor Problem

    mr rich did you mean all ceramic and electrolytic caps near the flyback???? ante, do you want me to replace CVBS and check video in circuit in the monitor right? i'm still working in the flyback area and havent replace anythin yet. But I will post any progress. I'm off every sat and sun.... I...
  8. J

    Monitor Problem

    ante, what do you mean by input connector? All I have here is a video in and AC power in.  ???
  9. J

    Monitor Problem

    Yah thanks for that. I was planning to use my broken tip 60 watts solder on it. And i'm kinda hesitant to do so. I also found some site that shows a particular problem like mine, but the monitor model is different. The problem is pointing to the same parts as what you've said. It says that I...
  10. J

    satellite speaker problem

    i see now. by reading some materials and some of you're ideas it is now clearer to me. what you've given is a active crossover which uses op amps to drive the speakers and I also seen a project in this site a two way crossover but it is a passive one or the a simple one because it only uses...
  11. J

    satellite speaker problem

    hmm. can play both mid and hi? so when i make a 3 way crossover my other satellite speaker can be connected to the mid....  :-\
  12. J

    Tell me how to protect my computer

    some antivirus software are packed with personal firewall, anti spam and anti spyware. try this softwares: 1. Kaspersky 2. McAfee 3. Norton Symmantec 4. Trend Micro You can download full computer security using azureus software. Download torrents and azureus in www.torrentpond.com.... works...
  13. J

    For fun - What is your degree?

    graduate of two vocational course in the same year.... Electronics Engineering Technology Major on Communication/Consumer and Computer Electronics  MSU-IIT, Philippines..... LOLz.. hehe  ;D
  14. J

    satellite speaker problem

    hi audio guru, do I have to connect my two satellite speakers to the tweeter output??? what will happen if i do that? johnc
  15. J

    UPS Problem

    I see, the irf740 is in parallel with 3 irf740 also. I can see that it is found near the ceramic caps and the source. There are also some burned resistors and transistors near the mosfet but it is too small to determine, and I think they are defective too. I would be glad to see you're APC 500...
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