Recent content by Pajarico

  1. Pajarico

    Facial soldering mask. What to buy?

    Hi, thanks. I have another doubt: That 3M mask is branded as "NIOSH approved N95", but NIOSH is an american standard and I don't know its European (or spanish) equivalent. This other 3M mask seems similar but it's categorized with the EN149:2001. I don't how well relate to the other. From a...
  2. Pajarico

    Facial soldering mask. What to buy?

    Thanks. My doubt is that I have always been informed that is not good to blow on the solder joints because a cold welding may appear. Could a fume extractor form cold weldings?
  3. Pajarico

    Facial soldering mask. What to buy?

    Hi, I need a soldering mask to filter the smoke that comes from the resin on the solder. I have seen many models from 3M, from 7 euro to 30+. They have interchangeable filters. The problem is I don't know if those models are designed for this purpose as they are clategorized for gas, particles...
  4. Pajarico

    How to know the ratio of a burnt transformer?

    Sorry, I don't understand.
  5. Pajarico

    How to know the ratio of a burnt transformer?

    Thanks for your reply Sarma: Things I did: -Search for service manual: so far no luck. It exists but all of the pages storing it are pay services. -Searched for the maker: Hard to know... The references described above yield references in google but it leads me to pages where the part is listed...
  6. Pajarico

    How to know the ratio of a burnt transformer?

    Thanks for your reply. The equipment is a Sony CMT-CP2WA. I have an open thread here asking for a service manual: http://www.electronics-lab.com/forum/index.php?topic=10796.0 The transformer itself has the configuration attached above. Externally it has a gray chasis, is non-toroidal, weighs a...
  7. Pajarico

    Computer S.O.S

    Also have you upgraded your adapter drivers or change your monitor configuration, like refresh rate, color depth or resolution?
  8. Pajarico

    How to know the ratio of a burnt transformer?

    My audio equipment burnt its transformer. I know it's only the transformer cause I unplugged the supply board (composed of the transformer and some diodes) and started to smell weird, some smoke coming from it, etc :P To pinpoint the problem to the transformer, I desoldered it and plugged...
  9. Pajarico

    Need Sony CMT-CP2WA service manual

    Hi, I'm trying to find this service manual. The CMT-CP2WA is an integrated double tape deck/cd/tuner. I have found it in some pages but all of them are pay-per-download (and not cheap). They have it at getmanual.com, which is a pay site, and allow to download a pdf page. There is also another...
  10. Pajarico

    Question about equalizer

    Thanks. Yes, it's a sine wave 1Vpp, forgot to mention... I don't know how to tell if it has harmonics (I've a very vague idea of this). It comes from a function generator and in the oscilloscope seemed clean. The point is that even if the 100Hz signal gets to the output of the high band filter...
  11. Pajarico

    Question about equalizer

    Hi, I've built a 3-band equalizer based on 741 op-amps. It's composed of three stages (you can see them from left to right in scheme adjunted): 1- Pass-band filters 2- Amplification/attenuation (x10/x.1 adjusting the potentiometers) 3- Adder (sums the three bands) The top op-amps are the low...
  12. Pajarico

    What's this? (retroilluminated mobile phone screen)

    Thanks. Could you point me to a circuit that you know is working? Most of the high voltage inverters I found use some transistors and a transformer (I doubt there was a transformer in there). EDIT: Now I have the name I'm doing a bit of research. Technicaly an EL panel is a capacitor which if...
  13. Pajarico

    What's this? (retroilluminated mobile phone screen)

    Hi, I've savaged an old mobile phone (an LG, about 5-7 years old, I'm not sure really). There's a plastic sheet of yellow-greenish color behind the LCD which is for illuminating the LED
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