Search results

Search Forums New Posts
  1. bertus

    Technique Question

    Hello, Here are several PDF's on soldering. Bertus
  2. bertus

    Detecting horizontal position

    Hello, We still have not seen a drawing of the set-up. Can you have a sensor next to the rod? Then you could use an optical reflective sensor: https://uk.farnell.com/on-semiconductor/qre1113gr/opto-switch-reflective/dp/1471020 When there is a reflective line on the rod, the sensor could detect...
  3. bertus

    Frustrated

    Hello, Have a look at this thread of the AAC. It contains a lot of information on leds, 555 and more. https://forum.allaboutcircuits.com/threads/leds-555s-flashers-and-light-chasers.19075/ You will have to register to the site to see the attachements, like over here. The username SparkyCal is...
  4. bertus

    Coronavirus transmission prevention device.

    Hello, On the WorldOmeter, the number of corona cases is already over 1.800.000 and the deaths over 113.000, worldwide. https://www.worldometers.info/coronavirus/ In the Netherland we have over 25.000 cases of corona registered. Bertus
  5. bertus

    Frustrated

    Hello, What are the values of R1 and R2, when you look at the schematic I posted? It can be that the led is flashing, but so short off, that you can not see it. I also would like to know the value of the capacitor. Bertus
  6. bertus

    Frustrated

    Hello, As said, the connections are not clear visible. Also watch for the resistor, not shorting to each other. This is basicaly the schematic you are using: Bertus
  7. bertus

    Coronavirus transmission prevention device.

    Hello, Happy easter: https://pixabay.com/photos/easter-virus-mask-easter-bunny-4964345/ Bertus
  8. bertus

    Samsung Monitor repair

    Hello, You can upload a file to the forum with the upload a file button. Keep the size below 300k, so resize the picture if needed. Bertus
  9. bertus

    COVID-19

    Hello, Here is an translation of a dutch article: Researchers Radboudumc discover "missing puzzle piece" in fighting coronavirus NIJMEGEN - Researchers from the Nijmegen Radboud university medical center have made an important discovery in the course of the disease in corona. This could be...
  10. bertus

    But before you ask... (Finding Service Manuals - a work in progress)

    Hello, The AAC has a special section for user and possible service manuals for test and measurement equipment: https://www.allaboutcircuits.com/test-measurement/oscilloscopes/ Bertus
  11. bertus

    COVID-19

    Hello, Here is a link to the WorldOmeters corona page: https://www.worldometers.info/coronavirus/ At the moment there are almost 1.500.000 cases and 87.000 deaths worldwide. The page is updated very frequently. Bertus
  12. bertus

    What to do with all these chips?

    Hello, An other way for prototyping is the manhattan style prototyping. In manhattan style prototyping, you can even mix though hole components with SMD. I will attach some documents with information. Bertus
  13. bertus

    bmw dvb-t2 tuner

    Hello, Read this page: https://learn.sparkfun.com/tutorials/how-to-read-a-schematic/all The first lines say this about the schematic: Schematics are our map to designing, building, and troubleshooting circuits. Understanding how to read and follow schematics is an important skill for any...
  14. bertus

    What's the function(s) of the extra contacts on so many cellphone's batteries?

    Hello, Have a look at this video and see waht happens at about 4:00, More info on the lithium batteries can be found in the battery university: https://batteryuniversity.com/learn/ Bertus
  15. bertus

    Understanding signals in PWM

    Hello, There are several ways of generating the signals for SPWM. Have a look at the attached document. More info can be found on this EDUCYPEDIA page: http://educypedia.karadimov.info/electronics/powercontrolspwm.htm Bertus
  16. bertus

    Logarithmic or linear potentiometers for volume and a 3 band EQ

    Hello, There is nothing mentioned of the potmeters, even when I translated it using Google. Looking at the type of schematic, try linear potmeters. Bertus
  17. bertus

    Logarithmic or linear potentiometers for volume and a 3 band EQ

    Hello, Is there a link to the text you mention? The schematic does not show information on the type of potmeters. For volume regulation a logarithmic potentiometer is used. In the schematic the volume regulation is done in the gain regulation of the opamp. I think a linear potmeter should be...
  18. bertus

    Coronavirus transmission prevention device.

    Hello, Found on the AAC: Bertus
  19. bertus

    COVID-19

    Hello, I noticed that about a quarter of the coronavirus cases is in the US: https://www.worldometers.info/coronavirus/ The netherland is 12th in the "ranking". Of the cases in the US about a third is in New York: https://www.worldometers.info/coronavirus/country/us/ Bertus
  20. bertus

    Pneumatic solenoid valve help

    Hello, Thicker wire will carry more current. Measure the supply voltage and the voltage accross the solenoid. Then you know if there is a large voltage drop accross the wires. Soldering will also reduce bad contacts as you might have in the breadboard. Bertus
Top