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  1. Miguel Lopez

    Practical vacuum tube signal generator

    Miguel Lopez submitted a new Project Log: Practical vacuum tube signal generator Read more about this project log here...
  2. Practical vacuum tube signal generator

    Practical vacuum tube signal generator

    Hello everybody I've been out of touch on valves due to time restrictions, but I want to share with you a small project that I just recently started. I have always had plans to build a second valve oscilloscope and a powerful audio amplifier (with 807s). Mr Time had been implacable, so I've...
  3. Miguel Lopez

    Help to get the service manual for a Yokogawa 2558A AC calibrator

    Hello everybody I'm in a huge need to get the service manual of the Yokogawa 2558A AC voltage & current standard. The one in our lab is not working properly and i would like to save it, as it is a very useful equipment. I already have the user manual Thanks in advance
  4. Miguel Lopez

    Op amp LM339 help

    Are you sure your power supply is delivering 5V?
  5. Miguel Lopez

    Building my own bench drill

    Another update on this project which althought it's operational right now, it is not finished yet. This is the "brand new" (NOS actually) chuck, and the two CFLs that I fit there to iluminate the drilling area. Details of the CFL fixing The switch in the lever to power on/off the motor...
  6. Miguel Lopez

    Where to find scrap electronics?

    "And in the end, the love you take is equal to the love you make" Has always worked for me in any aspect of my life.
  7. Miguel Lopez

    help i.f transformer how to make one

    Exactly. That's the one
  8. Miguel Lopez

    help i.f transformer how to make one

    I'm pleased to help. You can contact Harry Lythall by e-mail at http://www.sm0vpo.com/ Some time ago I downloaded an article from his blog about IF transformers which I consider very interesting. Saddly I can not find this article in the web right now. The name of the article is: DIY IF CANS...
  9. Miguel Lopez

    help i.f transformer how to make one

    This is a hobby, after all. So, why not? Give a look at this page: http://m0xpd.blogspot.com/2009/12/if-transformers.html
  10. Miguel Lopez

    Building my own bench drill

    The fulcrum for the lever. I want to cut the corner of the flat piece, but my hand and my saw don't want to do it. I will do it some day. I included an auxiliary bar to help me disassemble the drill. I can screw the shorter bar to the longer one to use the lever to lift the drill and remove...
  11. Miguel Lopez

    Circuits to build for a beginner!

    Which is available for free here: https://archive.org/download/TheArtOfElectronics-2ndEdition/the-art-of-electronics.pdf
  12. Miguel Lopez

    Building my own bench drill

    Some details about what I have done. There are some rusted parts yet which are not definitive and i will replace them with other pieces that I have to have done by a turner. The fulcrum of the lever being one of them. The springs are those used on the valves of internal combustion engines. I'm...
  13. Miguel Lopez

    Building my own bench drill

    An update on this project which goes ahead very slowly as I lack time for it.
  14. Miguel Lopez

    Faulty Popcorn Machine

    I will test everything again this weekend to see if I found the cause. Will tell you next week.
  15. Miguel Lopez

    Faulty Popcorn Machine

    Nop, it is a 120V device. What puzzle me is that the owner said that he has used many times, and then one day it stopped making popcorn..... I'm agree, but why?
  16. Miguel Lopez

    Faulty Popcorn Machine

    Yes, I know that, they are using the right popcorn, which is sold in the shops for that purpose.
  17. Miguel Lopez

    Faulty Popcorn Machine

    Has anybody fixed an OFP501COKE popcorn machine? A neighbourg of my mother bruoght one of this machines for fixing as it does not make the popcorn, but the thing is that everything seems to be OK. The motor works, there is a heating resistance in series with the motor, so I asume this...
  18. Miguel Lopez

    Help needed about ICL7135 pinout

    Don't worry, I'm very "audacious" and "intrepid".:) I will solve that anyhow. A couple of screwdrivers in the corners?...... We'll see Nothing is easy on this side of the world :D That is correct.
  19. Miguel Lopez

    Help needed about ICL7135 pinout

    I'm a newbie on this SMD technology, so have to ask about this: The Altera datasheet is referred to a 44 pin Plastic Thin Quad Flat Pack (TQFP), and the 7135 that I have is 28 pin Lead Plastic Chip Carrier (LPCC). Is that the same or are they diferent technologies?
  20. Miguel Lopez

    Help needed about ICL7135 pinout

    Will try to get one of them. I'm agree with you that sockets are useful for experimentation.
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