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  1. bertus

    Pneumatic solenoid valve help

    Hello, You could try a mosfet with a lower on resistance like the IRLB3036: https://www.infineon.com/cms/en/product/power/mosfet/12v-300v-n-channel-power-mosfet/irlb3036/ Bertus
  2. bertus

    Pneumatic solenoid valve help

    Hello, The use of a mosfet in stead of the transistor already gives more power to the solinoid, as the voltage drop accross the mosfet will be lower as the transistor. Bertus
  3. bertus

    Pneumatic solenoid valve help

    Hello, This is the schematic of what I breadboarded: Bertus
  4. bertus

    Pneumatic solenoid valve help

    Hello, I have drawn the parts again in fritzing, as in the openings post-link: Bertus
  5. bertus

    Pneumatic solenoid valve help

    Hello, Where is the ground connection from the arduino? Bertus
  6. bertus

    Pneumatic solenoid valve help

    Hello, Do you still use the resistor on the gate? If so lower the value to 22 Ohms. Bertus
  7. bertus

    What to do with all these chips?

    Hello, You can also have a lot of fun with the books from Forrest Mims: =mediatype%3A%22texts%22&and[]=loans__status__status%3A%22-1%22']https://archive.org/search.php?quer...type:"texts"&and[]=loans__status__status:"-1" An other book with a lot of circuits is the Giant handbook of electronic...
  8. bertus

    Pneumatic solenoid valve help

    Hello, TIP120 ia a NPN Darlington transistors. The IRLZ34 is a N-gate mosfet. The arduino signal should go to the gate of the mosfet, instead of the base of the transistor. The source of the mosfet should be connected to ground, instead of the emittor of the transistor. The drain of the mosfet...
  9. bertus

    Substituting a Capacitor

    Hello, Those round capacitors will likely be small ceramic capacitors. You can "decode" the value using the following pages: https://marvac.com/pages/ceramic-capacitor-codes https://www.circuitspedia.com/how-to-read-ceramic-capacitor-code-value-104-chart/ An 470 nF would have a code 474 on it...
  10. bertus

    Digital display

    Hello, Do you have more information on the welder? Do you have details on what signal is coming from the potmeter in your welder? Bertus
  11. bertus

    Need help understanding this circuit

    Hello, Where are you located? If you are in the UK, you might want to buy a beginners kit from Bitbox: https://www.bitsbox.co.uk/index.php?main_page=product_info&cPath=272_276&products_id=2010 They also have some other kits with parts...
  12. bertus

    Back to Back Schottky Diodes

    Hello, The upper schematic shows anti-parallel diodes. The voltage differende between the two gounds will be max 1 diode voltage drop. The lower schematic has the diodes back to back. There will never flow any current, until the reverse breakdown voltage of the diode. Bertus
  13. bertus

    Need help understanding this circuit

    Hello, Here is a page about reading schematics: https://learn.sparkfun.com/tutorials/how-to-read-a-schematic/all In there you will see this picture: Bertus
  14. bertus

    Need help understanding this circuit

    Hello, It would have been nice if you posted the schematic in stead of the youtube. I have extracted the schematic: The 22uF determined the modulation speed, as it is connected to pin 5 of the second 555 and the 470 nF determined the tone frequency. Bertus
  15. bertus

    Current sensing using Arduino

    Hello, As for the decoupling capacitors, the AAC has a nice thread with a lot of information: https://forum.allaboutcircuits.com/threads/decoupling-or-bypass-capacitors-why.45583/ Bertus
  16. bertus

    COVID-19

    Hello, @(*steve*) , I hope you are well. The world is reaching for 1000.000 infections already: Corona seems to be much worse as the flu: Bertus
  17. bertus

    555 timer

    Hello, On the AAC site a hysteretic oscillator was suggested. https://www.allaboutcircuits.com/textbook/experiments/chpt-8/555-hysteretic-oscillator/ To make it asymetrical, you can use diodes: Bertus
  18. bertus

    555 timer

    Hello, Did you not get answers on the AAC forum: https://forum.allaboutcircuits.com/threads/555-timer-keep-a-led-off-for-60-seconds-than-on-for-2-seconds.168183/ Bertus
  19. bertus

    Sciaky model C.R.O.I. what is it?

    Hello, If you are interested in the datasheet of the CRT, you can find it on this page: https://frank.pocnet.net/sheetsD1.html https://frank.pocnet.net/sheets/152/d/DH3-91.pdf Bertus
  20. bertus

    Value of this crystal?

    Hello, Just buying the chip won't help you. It must be configured and factory programmed. See page 72 of your datasheet. Bertus
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