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  1. bertus

    BJT vs MOSFET for logic gates help

    Hello, What is wrong with the symbols that Tristan is using: Bertus
  2. bertus

    What is the use of IC 74ACT244MTCX (dsPICDEM MCLV-2 development board)

    Hello, Look in the datasheet: Bertus
  3. bertus

    What is the use of IC 74ACT244MTCX (dsPICDEM MCLV-2 development board)

    Hello, I see that the ACT is driving some gate drivers, wich are just logic inputs and will not draw many current: bertus
  4. bertus

    What is the use of IC 74ACT244MTCX (dsPICDEM MCLV-2 development board)

    Hello, What will the ACT be driving? Without the rest of the schematic, we can only be guessing. Bertus
  5. bertus

    What is the use of IC 74ACT244MTCX (dsPICDEM MCLV-2 development board)

    Hello, I do not know what the MCU can deliver. The ACT can deliver 24 mA max. (see the attached datasheet in post #2) Bertus
  6. bertus

    Comedy Thread

    Outlook A mushroom and an onion have a profound conversation about life together. The mushroom says to the onion: "my life is a complete nightmare. First I am cut into slices and then fried alive and eaten. " To which the onion says: "It can be much worse, because I will be skinned alive...
  7. bertus

    How to power a UV-C LED

    Hello, Be carefull with UV light. It can be harmfull to humans: https://www.safety.rochester.edu/ih/uvlight.html Keep in mind that leds are current driven elements and not controlled by a voltage. Does the power supply have a current limiting setting? if so, set it at about 200 mA. The voltage...
  8. bertus

    What is the use of IC 74ACT244MTCX (dsPICDEM MCLV-2 development board)

    Hello, You could call it level translation, when you go from 3.3 to 5 Volts. Bertus
  9. bertus

    Paperwork for AVO two piece valve tester.

    Hello, I have added the following link to my tube resource: http://www.nucow.com/120,000FREE.htm Bertus
  10. bertus

    What is the use of IC 74ACT244MTCX (dsPICDEM MCLV-2 development board)

    Hello, There are 2 X 4 line drivers (buffers) in the chip. When you look at this drawing, it might become more clear: The /OE input can disable the 4 connected ports, making the outputs high-Z. You might want to download the LOGIC Pocket Data Book...
  11. bertus

    Do you know the partner sites of this site?

    Hello, This site is a partner of the following sites: Bertus
  12. bertus

    Need help selecting power supply and motor controller

    Hello, Amazon has this powersupply: https://www.amazon.ca/BENSN-Compatible-Universal-Household-Electronics/dp/B082XRJ4LN/ref=sr_1_8?dchild=1&keywords=12+volt+power+supply&qid=1606069808&sr=8-8 And this speed controller...
  13. bertus

    Need help selecting power supply and motor controller

    Hello, You can use a 12 Volts 1 Amp or more as powersupply. You will have to take the stall current in account, wich can be much higher (even upto 5 times) than the running current. For speed control, you can use the board that @Bluejets showed. Bertus
  14. bertus

    Analog frequency meter

    Hello, In the article I posted they call it a "Vibrating Reed Mechanical Resonance Type Frequency Meter". Bertus
  15. bertus

    Analog frequency meter

    Hello, There will be analog vibration meters without the electical excitation. The mechanical movement of the vibration of the to be measured object must be able to reach the reeds to show the frequency. Bertus
  16. bertus

    looking for schematic and hook up data for Ultra ult-vx700 ATX ps

    Hello, Depending on the age of the power supply, it will have 20 or 24 pins. This is the connection diagram for the 20 pins: http://www.hardwarebook.info/ATX_Power_Supply This is the connection diagram for the newer 24 pins: http://www.hardwarebook.info/ATX_v2.2_Power_Supply Bertus
  17. bertus

    Need help selecting power supply and motor controller

    Hello, What are the specifications of the motor? That information is needed to choose the correct power supply. Bertus
  18. bertus

    Analog frequency meter

    Hello, I do see your pictures. I don't know the RR scale, perhaps it is the rotation rate. Here I found some pages about the working principe of the vibration meters...
  19. bertus

    Operating range of the devices

    Hello, It depends on how the voltage regulators are made. Linear voltage regulators will have a larger loss as switching regulators. Linear regulators will hardly add noise to the system. Switching regulators can add noise due to the switching to the system. Looking at your example with an...
  20. bertus

    Vbe, Darlington Pair 3v?(?)

    Hello, @Harald Kapp , I think you have shorted R1 in the diagram. Bertus
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