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HarryA

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Everything posted by HarryA

  1. There is a library file ( GOLANG library for SPI ) here that maybe helpful? https://github.com/stamp/CS5484 I have problems finding the page that has the {code} button to download the file; you may have to dork around with the URL a bit.
  2. There are a number of sellers on Ebay that have 4 channel modules that ship from China. Most have relay outputs or other types of outputs. Not knowing where in the world you are makes it difficult to help you. The RS-485 is also known as the EIA-TIA 485 or TIA-485. See for example: https://www.ebay.com/itm/164863960516?
  3. How does one edit their Public Profile? I can see it under Profile but not how to change it.
  4. My Razor Ecosmart scooter uses a 500 watt motor and the Gyroor Warrior off terrain hover board uses a pair of 350 watt motors for a total of 700 watts. 750 watts equals 1 horsepower. see: https://www.amazon.com/dp/B0779826VN?
  5. You may find some useful information on Wikipedia here: https://en.wikipedia.org/wiki/Voltage-controlled_oscillator I believe it is a trade off between the noise created by high frequency VCOs and that introduced by the multipliers. A low frequency VCO has less noise so using a multiplier to get the high frequency gives the best overall performance. But I can not find the literature that discusses that.
  6. You do not give enough information to enable one to be very helpful to you. What are your requirements for you off road rover? You may look at similar devices (like electric scooters perhaps) via the internet and see what size motors they use. Here are some 12 volt motors from 1hp to 1/3 hp. https://www.ebay.com/itm/233312841977?_ if that link does not work search on ebay for "DC MOTOR, 1/3~3HP, 56C, 12/24/90/180V, 1750RPM, TEFC, Permanent Magnet"
  7. You can use one series resistor. See "Calculating an LED resistor value" at https://www.electronicsclub.info/leds.htm resistor =(supply voltage - LED voltage)/LED current = (62 - 2)/0.020 = 3000 ohms which is a standard resistor value.
  8. It depends on the area of specialization. See Penn State ( Pennsylvania, USA) for example. https://www.eecs.psu.edu/students/undergraduate/EECS-Students-Undergrad-EE-Specialization.aspx
  9. 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/
  10. 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 represented as 0R5, 1.0 as 1R0, and 2.2 as 2R2 respectively." You can find 1.5uf 250vac capacitors on Ebay that ship world wide. It's difficult to tell one where to purchase something if you do not know where in the world they are. How do you fix a horrible URL?
  11. 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 !
  12. 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/
  13. 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) in case a Chinese spent rocket lands on your house. Or print on papyrus and seal in clay jars 😀
  14. 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 conditions (from +5°Cto+35°C, relative humidity≤75%) for at least two years; capacitors of the SIKOREL series can be stored for as long as 15 years under these conditions. Within these storage periods the capacitors can be operated at their rated voltage directly after being taken out of storage. It is recommended to mount the capacitors in the application within one year of delivery in order to prevent any problems with solder ability of capacitors on PC " There is some information at: https://en.wikipedia.org/wiki/Electrolytic_capacitor#Reliability_(failure_rate)
  15. 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 never use it.
  16. 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: https://en.wikipedia.org/wiki/Electrolytic_capacitor#Operational_characteristics Years ago, okay many years ago when I was in HS, I used to repair radios and bw televisions. I repaired a radio that a mouse had chewed into a wax coated capacitor.
  17. 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 audio amplifier I power up a couple of times a year. I keep thinking someday I will use it - perhaps.
  18. 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 is a var (volt-ampere reactive) which is an back emf from the coil as the field collapses. This maybe more then the charger can handle. Shavers typically draw 10 to 15 watts off the mains and some higher.
  19. 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 will start low then rise as the capacitor charges indicates a good capacitor. If this fails I disconnect one lead and try again. If the reading stays low it could be shorted. If no capacitance it will often just show a high reading. see: https://www.wikihow.com/Test-a-Capacitor If you doing many capacitors perhaps a tester would be worth the monies: https://www.amazon.com/HiLetgo-Multifunctional-Capacitor-component-Backlight/dp/B01MYU0QI3/ref=sr_1_10?dchild=1&keywords=tester+electrolytic+capacitor+tester&qid=1619267945&sr=8-10
  20. Are you looking for a circuit like this? This is not a finished circuit it is just an example.
  21. 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 example. https://www.sensorsone.com/10bar-150psi-0-10v-0-5v-1-5v-pressure-sensors/
  22. "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 انگلیسی ترجمه نمی کند. "سنسور فشار 10 برابر 5 ولت" چیست؟ You may find this translator helpful: به نظر شما این مترجم مفید است https://translate.google.com/
  23. 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: https://www.amazon.com/SMAKN-Trigger-Switch-Latching-controlled/dp/B01CN7V0F6/ref=sr_1_20?dchild=1&keywords=latching+relay&qid=1617978673&sr=8-20 What are you using of inputs to the circuit?
  24. 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 resistor to connect to 12 volts. If you need help connecting to the board I will look at its specifications. https://www.youtube.com/watch?v=nlPj0VL_bGU https://www.youtube.com/watch?v=zd3n8pYFx1g
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