Recent content by Miguel Lopez

  1. Miguel Lopez

    Building a pulse counter and generator

    These are some of the circuits that I intend to use on the pulse counter. One of them has Spanish markings. If needed, I can translate.
  2. Miguel Lopez

    Building a pulse counter and generator

    Hi All I want to share this project with all of you. I intend to build a pulse counter to be use in a pulse genrator for my workshop. I will use TTL chips mostly with some CMOS exceptions. For the display I want to use some Soviet IV-8 fluorescent 7 segment tubes.In fact, are valves, with...
  3. Miguel Lopez

    Hello everybody......again

    Hello everybody I re-introduce myself as I've been a little absent from the forum. I've been very busy at the job and it has been impossible for me to share on this forum for a while. I hope to be here more frequently beginning now. All the best from Cuba for all of you !!!!
  4. Miguel Lopez

    Pigeons electronic repeller

    Hello everybody Do you have problems with pigeons at home? I do. I have read about ways to repel or deter pigeons at home and there are many electronic repellers on the market, but they are out of my reach, so are out of the equation. I thought that I could build one of those devices if it is...
  5. Miguel Lopez

    Frankenstein's Components.

    My old man used to have one of those. Maybe it could be hidden somewhere on his massive stuff stock. Those are common in Cuba too
  6. Miguel Lopez

    Building little vacuum tube amplifier

    The amplifier is already fully functional. I used it this weekend amplifying the signal from a DVD player. Pictures on the Project Log
  7. Miguel Lopez

    Building little vacuum tube amplifier

    Well, last weekend I found a suitable speaker on my "war reserve". It fits perfectly on the amplifier and sounds well too. Wait for pictures
  8. Miguel Lopez

    Building little vacuum tube amplifier

    This project is delayed due to lack of available time but I have been able to do some advances on it. You can check it in the Project Log
  9. Miguel Lopez

    Oscilloscope for dummies.

    Wrong, they do. (Or you can do it, more specifically speaking) It just depend on where you connect the negative terminal of the measuring probe
  10. Miguel Lopez

    Building little vacuum tube amplifier

    Miguel Lopez submitted a new Project Log: Building little vacuum tube amplifier Read more about this project log here...
  11. Building little vacuum tube amplifier

    Building little vacuum tube amplifier

    Hello everybody I want to share with you the steps on building a little and practical audio amplifier, based on Soviet vacuum tubes. I decided to build this little device in order to use it as an tool in future experimentation on vacuum tube electronics. I have always planned to build a radio...
  12. Miguel Lopez

    Help about fridge protector delay time

    Internal 4 MHz RC oscillator.......great.... As said before, a pendant subject for me. Thanks a lot. This is my learning for today.
  13. Miguel Lopez

    Help about fridge protector delay time

    OK, it seems that it is not possible to extent the delay time so I think this topic is finished Now, as I said before I know nothing about microcontrollers, so in order to improve my knowledge I beg all of you to allow me a little off-topic. How can a time base be generated inside a...
  14. Miguel Lopez

    Help about fridge protector delay time

    Is it possible to vary such time base by adding external components?
  15. Miguel Lopez

    Help about fridge protector delay time

    Thank you all for your answers I took this picture, but I didn't took a picture of the other side. Anyway, the other side contains only the filter capacitors for PSU and measurement, the relay, and the droppers R-C. I will take a picture today to show tomorrow. In the shown picture, there is a...
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