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Recent content by rmarchesi

  1. rmarchesi

    50/60 Hz passive detecting system

    Dave, there is plenty of literature on the web. In the past we have shielded a part of an hospital where they treat patients with magnetic fields. I'm not a doctor and I can't judge.
  2. rmarchesi

    50/60 Hz passive detecting system

    Thank you guys, for your answers. Gunnar, I know we live in an environment that is completely full of waves, and we live without so many problems, but some people say the can 'feel' the fields. What should we do? Help them in feeling more protected or just leave them with no help? This is s...
  3. rmarchesi

    50/60 Hz passive detecting system

    We are trying to develop an economic portable system to detect ELF magnetic fields. We would like this device be able to detect fields as low as 5 to 10 mG and if possible we would like to avoid active components to amplify the signal, because this system is addressed to people that are...
  4. rmarchesi

    LM386 audio amplifier

    Thank you, Glenn. In the meantime I've solved it. It was probably 50 Hz noise coming from power lines. I put a small cap between positive of power supply and ground and everything disappeared. I don't have testing instruments, so it was hard for me to understand where it was coming from. A fact...
  5. rmarchesi

    LM386 audio amplifier

    I'm trying to make a small audio amplifier using an LM386N-3 IC from National. 700 mW max output. I have a small loudspeaker, 4 ohm, 700 mW max power. I connect the IC like indicated in the datasheet, with a gain of 20. I get lots of distortion, even at low levels. I'm using the schematic...
  6. rmarchesi

    Fine wire knotter

    Does anyone know how to join two stainless steel fine wires? Diameter 0.05 mm. Can I find knotters that can work with such fine wires? Thanks, Riccardo Marchesi
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