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HarryA

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HarryA last won the day on April 11

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About HarryA

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  • Birthday June 23

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    USA, Pennsylvania, Susquehanna Cty, Forest Lake
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    Canoeing, woodworking, electronics, and gardening.

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  1. Lets see if this is readable. Using a 2n2222 - about 10 cents apiece. Current from the source is 40ma with a base resistor of 1000 or 10k. In the view the yellow trace is the current through the relay; scale on the right . Green is the voltage at the base; scale on the left. I have no idea what the inductance would be so I set it at 0.001 henry.
  2. from: http://static6.arrow.com/aropdfconversion/ee14f7b4a3764f5a2d5bf5d73381b76d11c173d/3a3941-datasheet.pdf.pdf
  3. Medición de variables electricas modelo #2 (Measurement of electric variables model # 2) ¿Qué es el modelo # 2? (What is model #2 ?)
  4. I believe your circuit is not quite correct. The resistor and capacitor (C1 and R3 ?) belong to the DIAC not the TRIAC. see the circuit here: https://www.electronicshub.org/simple-fan-regulator-circuit/
  5. That is a good idea but how do you get the divide by 2.7 required ? Is the best one can do is to divide by 5 then by 2 or 10 and 4 for 2.5 perhaps. There is a good phase locked loop frequency multiplier tutorial at: www.youtube.com/watch?v=5by0os8RrFY
  6. The only way I can think of to do that is to use two circuits. First a frequency to voltage converter circuit. Then feed the voltage output of that circuit into a voltage to frequency converter circuit. One can find such circuits by searching on the internet. A circuit simulator would be helpful here. The 9400 chip can be used as a voltage-to-frequency or frequency-to-voltage converter. Perhaps there is a newer chip? Hopefully someone else will have a better idea for you 😐
  7. The vertical green line supplies current to the transistor. The other part of the green line supplies current to the detector which modulates it to form the audio and afc outputs.
  8. On my forum if you replace http: and keto one can at least alert guests not to click on the links and that may help. At least it is not difficult to implement. from my forum (note spaces around SPAM and SPAMMER - helps them stand out): Put the word to be censored on the left, and what to change it to on the right. http: => SPAM KETO => SPAMMER given: http://www.badguy.com => SPAM //www.badguy.com this is keto crap => this is SPAMMER crap Members posting url's in a post would learn to use the short version without the http: www.rcgroups.com Is spam the correct word or does that only apply to emails?
  9. You could ask for help finding a schematic here - maybe helpful: http://www.fixya.com/support/p143760-mge_pulsar_evolution_2200_esv22_ups Good luck.
  10. the manual is here if that is helpful: https://www.manualslib.com/products/Mge-Ups-Systems-Pulsar-Esv-22Plusrack-1938198.html
  11. If you open the register page and right click on the page and select "view page source" you see the html code that makes that page. If you search on that code for: "form_q_and_a" you will find the block of code that renders that area on the page.(in firefox search by ctrl+ f) and that contains your question. If one is comfortable with working with files on the server one can find the file that contains the "form_q_and_a" string. then download it to your pc and replace the text string with an image ( jpg or png file ) of the text in mixed colors and fonts. If you don't have the tools to create such a file I do. You may not see you text string in that file as it maybe added in at run time. In my first forum I got to the point that I would register members via an email request myself; they where not allowed to do so. I used their requested user name and assigned them temp.password and that works well if you do not have many request per day. It beats having to clean up the forum everyday.
  12. In the world of electronics what is a "landing deck"? I only know of landing decks on aircraft carriers and at the foot of stairs. I am guessing it is where you "land" your cell phone.
  13. Can the bad guys login via "Sign in with Twitter or Linkedin" or Anonymously thus avoiding the question?
  14. To start with those capacitors are 4700 microfarads (not 4.7) at 400 volts, not cheap. The resistors are 50 watt resistors. I would think the yellow leads on your transformers are taps, here unused. If you connect two of the output black wires together and measure the voltage across the other two you should get 220 volts rms. If not select a different wire for one of then. You must have at least a inexpensive multi-meter to work with. Beware these are high voltages and those large capacitors hold enough current to do you in!
  15. Something like what is the: "unit of capacitance"a five letter word". It is only a slight inconvenience at most for real people plus they only have to do it once. I set up a forum earlier this year and asked the local padding group if they wanted to use it but they decline. I did not do anything with it for a few months until I got an error message via an email. When I looked at it I had 6800 members, 90% were Russian. As I could only delete 30 members at a time it took awhile to get rid of them.
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