HarryA

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HarryA last won the day on December 29 2016

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About HarryA

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    Advanced Member
  • Birthday June 23

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  • Gender
    Male
  • Location
    USA, Pennsylvania, Susquehanna Cty, Forest Lake
  • Interests
    Canoeing, woodworking, electronics, and gardening.
  1. " which one is right? " What two are you comparing?
  2. The first one is 200 ohms @ 5%. see: https://www.digikey.com/en/resources/conversion-calculators/conversion-calculator-resistor-color-code-4-band Well on second look via the chart it does come out to be 20.1 but you can not argue with the meter!
  3. This unit will work stand alone (with out a UNO) and has wifi> https://www.amazon.com/HiLetgo-Version-NodeMCU-Internet-Development/dp/B010O1G1ES/ref=sr_1_22/136-5999016-8336545?ie=UTF8&qid=1496770085&sr=8-22-spons&keywords=arduino+wifi&psc=1 Read the Q/A section.
  4. If you search on amazon.com for "arduino wearables" you will find a number of devices. There are also a number of books on the subject.
  5. I gather if you want 1.8 volts out you buy the LP3853ET-1.8/NOPB and if you want say 2.5 volts you buy the the LP3853ET-2.5/NOPB chip and so forth. They must define the input voltages for each somewhere? What do you mean by "Can I use LP3856 here ?" ? What is your application?
  6. Free to good home for 5$ shipping and handling. Save them from the land fill! Some are old enough to be your parents! Antediluvian? You will have to look it up.
  7. "50Pcs NPN Transistor TO-92 2N2222A 2N2222 Brand New Practical High Quality" (Ebay) Does "Practical High Quality" mean hfe's of almost 100
  8. Hello, I will look at what maybe needed. I am thinking a pair of 555 timers (better but more expensive are the mc1455p timer clock chips). One for the 5 second delay which triggers the second one for the 1 minute on delay. The second one feeds a divide by 5 counter chip for the 5 minutes. For the photo cell perhaps a photo transistor. I just finished a circuit that uses a infrared television sensor to trigger a 555 chip via the television remote. You may want a breadboard and a few jumper leads. Also if you do not have any electronics instruments look for a simple logic probe circuit on the internet; it will use a led as an indicator that the timers are pulsing. It can be fabricated on one end of the breadboard. Then the devil is in the details. Perhaps we can con audioguru into helping with them; he is quite knowable. On second thought one could build LEDs into the circuit so no logic probe would be necessary.
  9. You may wish to look at: Using the TIP120 & TIP125 Darlington Transistors with Arduino https://www.youtube.com/watch?v=wxCJ9NUErwA
  10. Well already having ruined jknittandkarr's thread - sorry jknittandkarr. But another place to spent more money beyond amazon.com and ebay is at the goodwill: see "computers and electronics" off: https://www.shopgoodwill.com/listings/ Don't bid on the solar panel! I am watching
  11. Good question. I test them with my 4 of 5 stars Chinese tester I never buy anything very expensive that I could not toss out. https://www.amazon.com/gp/product/B01M0UXHYY/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1
  12. Yes some people have problems with parts from China but I buy a lot for China. And I never have any problems. I have two items in the "China queue" now. I call it bypassing Wal-Mart and NTE
  13. Go directly to the source: http://www.ebay.com/itm/10pcs-0-8-inch-1-digit-led-display-17-seg-Alphanumeric-Common-anode-BLUE-/311641497467?hash=item488f47df7b:g:nBAAAOSwsB9V87Ec That is where they are all made anyway.
  14. USA, State of Pennsylvania, Susquehanna County, Forest Lake Township

  15. (1)"I have an idea, but I do not know how." What is your idea? (2)"I noticed that the charger for my phone if the phone is not turned on to charge - it does not consume anything. But when I turn on the micro usb connector - then begins to consume." Find; a statement of fact. (3)"Now fit a box that will convert unbalanced audio signal into balanced. But the transformer can not fit in the box of the device and the target mount it in an external box. I do not want a permanent transformer is plugged in. " What is the relationship between sentence (2) and sentence (3)? What are trying to do in sentence (3)?