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  1. 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...
  2. 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 !!!!
  3. 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...
  4. 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...
  5. Miguel Lopez

    Help about fridge protector delay time

    Hi all Recently a friend of mine brought me a fridge protector with the purpode to extent the timing period. It's a Hunter EL-1595. https://gmtuercas.com/products/fr-elc-el-1595 Fridge protectors are very common in Cuba due to anomalies in our electrical distribution system. I have even built...
  6. 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...
  7. 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
  8. 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...
  9. Miguel Lopez

    Help needed about ICL7135 pinout

    Hello A friend of mine gave several MAXIM ICL7135cqi chips. I would like to experiment with these chips as they could be useful to build a good digital bench multimeter. The datasheets that I have found on the web, show the pinout of the dual in line package. but the ones that I have are of the...
  10. Miguel Lopez

    Yu Fong YF-600 schematic

    Hello I'm searching for the schematic of the Yu Fong TF-600 clamp meter. I have fixed one of them and I want to adjust it. In order to move the right potentiometers I need the schematic. I just have found this page...
  11. Miguel Lopez

    Instability on a diferential output amplifier

    Hello I've been trying a diferential output amplifier, as it is my intention in the future to build a transistor oscilloscope, with better performance that the valve one that I'm currently using. Althought the circuit that I've been testing amplifies the input signal very well, it suffers from...
  12. Miguel Lopez

    Building my own bench drill

    Hello everybody As this project is not exactly electronic, but electro-mechanical, I think that this is the best place to post it. The thing is that since I remember, I have used a bench drill that my father built. The bench drill is one of the electro-mechanical tools that I use most of the...
  13. Miguel Lopez

    Back from the Dark Side

    Hello again to everybody After several months off-line, I'm back again at Electronics Points. It seems that I was in the Dark Side, so my IP address was not allowed to connect to the server. It seems that is something related to our Northern neigbourg. Hope this situation has solved forever...
  14. Miguel Lopez

    Homebuilt Signal Generator

    Hello everyone The need for a signal generator in an electronics workbench is out of discussion. I built a tiny signal generator in the past, that I've been using till now. It is very limited as it gives up to 50 kHz of sinewave. It has been very useful but now I need something else. My...
  15. Miguel Lopez

    Datasheet for FG209M2 Fluorescent Display

    Hi everybody I would like to find the datasheet for al old FG209M2 fluorecent display. I retrieved from al old pHmeter, and it looks OK. The getter is still black, so it seems that it has not lost the vacuum. I searched for a while on Google, but I found nothing about the datasheet. I couldn't...
  16. Miguel Lopez

    Audio/Video to RF. Help!!

    Hello I need to convert an Audio and Video signal to RF. Is there a way to build a simple circuit to do this. I don't mind if for channel 3 or 4. It is to watch the Cuban Digital TV, using a decoder (Audio/Video output) in an old Soviet TV. Thanks in advance
  17. Miguel Lopez

    Help with aerial for channel 38

    Hello everybody I need some help to build an aerial to tune the channel 38. In Cuba, digital TV has started with this channel and althought I can tune it with the legacy aerial (wide band), I find that sometimes reception is not good, so I thought to build, a specially-built antenna for the...
  18. Miguel Lopez

    Uploading Image problems

    I found that I don't know how to upload pictures now. :( Can you explain me how to do that, please? ;) Thank in advance
  19. Miguel Lopez

    Home made valve oscilloscope. Version 2.0

    Hello everybody A couple of years ago, I began to build an oscilloscope from scratch. I had a Soviet C1-94, but the CRT failed, as well as several parts of the circuit that I had to repair from time to time. Finally the C1-94 got out of service and i wasn't able to fix it, mainly due to the CRT...
  20. Miguel Lopez

    Help with synchro sawtooth generator

    Hello all I'm trying to design a sawtooth generator circuit capable of free running and synchro operation. The purpose is to built a transistor scope in the future to replace my homebrew valve oscilloscope. I have designed a circuit capable of synchro operation and I have tested in the...
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