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  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 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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