Search results

  1. HarryA1

    ZY12PDN USB C 3S 12V Li Ion Battery Charger

    Can you provide a block diagram of your set up? You speak of "my boost converter" isn't the ZY12PDN a type of boost converter? From the USB_C five volts to various voltages? Some useful data here: https://www.alexwhittemore.com/notes-on-usb-pd-triggers-and-zy12pdn-instructions/
  2. HarryA1

    Could you please help me find this capacitor?

    Yes, I think you are correct. Scherz and Monk's Practical Electronics for Inventors has: metallized ployester film capacitors: 2u2 = 2.2uf. The K would be -/+10%. also: "In case, small values with decimal points needs to be represented, then the alphabetical letter “R” is used such as 0.5 is...
  3. HarryA1

    Could you please help me find this capacitor?

    If it is a 120 volt Cuisinart blender then you can get one here: They ship world wide. Else search for "1 uf 250vac capacitor" https://www.ebay.com/itm/281873849657 That is a horrible url !
  4. HarryA1

    Could you help me check if I did it right or not ? voltage controlled oscillator with BJT

    That looks correct. Good job with the simulator.
  5. HarryA1

    Questions NOR flash memory

    You have asked this question on 3 or 4 other forums and got labeled on this one as a troll: https://www.electro-tech-online.com/threads/question-nor-flash-memory.161524/
  6. HarryA1

    Questions NOR flash memory

    The problem is what will read a flash drive 20 years from  now?  The same for data storage devices like CD's, hard drives, and tapes.  Perhaps the best solution is to transfer the data to new media every few years.  Also it is a good idea to store copies off site (at friend's home for example)...
  7. HarryA1

    Question electrolytic capacitor

    No, the information is not  readily available.  From  page 29   section 7.3.2  "Storage condition" in: http://www.epcos.de/blob/185386/download/4/pdf-generaltechnicalinformation.pdf "If not otherwise specified, our aluminum electrolytic capacitors can be stored voltage-free at above stated...
  8. HarryA1

    Question electrolytic capacitor

    I take it if one is not going to use something often one should power in up say once a year or so. The question is if one is not going to use something often enough to keep the electrolytic capacitors refreshed why keep it at all?  I keep my old audio amplifier thinking I will use but I may...
  9. HarryA1

    Question electrolytic capacitor

    Folks that restore old radios say do not power them up until replacing the capacitors. It is difficult to find information on failing due to disuse. Wikipedia has some  information related to storage. See "Performance after storage" here...
  10. HarryA1

    Question electrolytic capacitor

    Modern aluminum electrolytic capacitors have longer shelf lives then the old ones, usually around 2 years. Perhaps powering up  old equipment a couple of times a year would be sufficient. Once a month is perhaps unnecessary. I have never found any good information on that subject. I have an old...
  11. HarryA1

    Joao paulo

    There are three things to consider. First the voltage from the charger is higher than the batteries voltage in order to charge the batteries. Second the current supplied by the charger is most likely much smaller than the current supplied to the unit by the batteries during operation. Also there...
  12. HarryA1

    Question electrolytic capacitor

    I would think that  using the devices, as you suggest, once a month would be a good idea. Also you could do a quick test on the capacitors if you have not used the device in some time. I often check the capacitor with a multi-meter using the ohmmeter range without disconnecting it. The reading...
  13. HarryA1

    Car Inflator digital

    Are you looking for a circuit like this? This is not a finished circuit it is just an example.
  14. HarryA1

    Car Inflator digital

    Sorry but you must tell us what you have now to work with and what are your goals. Do you have a sensor or need to find one to buy? What type of air pump or inflator do you have or need? If you need a sensor this company has 1 - 5 volts  ones that you could subtract 0.5 volts from as an...
  15. HarryA1

    Car Inflator digital

    "Hi, I need a digital car blower circuit with the ability to adjust the pressure with a pressure sensor 10 times 5 volts with an output of 0.5 to 4.5 volts." Sorry Google does not translate Persian into English well. What is "a pressure sensor 10 times 5 volts" ? با عرض پوزش ، فارسی را به...
  16. HarryA1

    volume attenuator relay

    Step 1: Are you committed to using to using the TC4420 and 40193?  Consider using a circuit like the one below. The direction of current flow  through the relay coil depends on which transistor is on.  Also if you do not have the relays yet these may simplify your design...
  17. HarryA1

    5 pin halo switch to soundboard

    There are a couple of videos on Youtube you may find helpful. The first one uses a socket with colored wires while the second one shows the terminals on the back of the switch. In the first one he connects directly to 12 volts while  in the second one he claims the LED is 3 to 6 volts and uses a...
  18. HarryA1

    Sink current using PCA9685?

    That is a complex beast! Given: "Each LED output can be off or on (no PWM control), or set at its individual PWM controller value. The LED output driver is programmed to be either open-drain with a 25 mA current sink capability at 5 V or totem pole with a 25mA sink, 10 mA source capability at 5...
  19. HarryA1

    volume attenuator relay

    As the TC4420 accepts logic level inputs and the  40193 output is a logic level why is anything needed between them? Also both  only require a single voltage supply (Vdd) for the circuit shown a dual supply would not be required. There are single Vdd supply op amps  if you need  one. I have a...
  20. HarryA1

    Reading schematics for ss williams pinball stellar wars

    Are pinball schematics any different than electronic schematics? https://learn.sparkfun.com/tutorials/how-to-read-a-schematic/all
Top