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About HarryA

  • Rank
    Advanced Member
  • Birthday June 23

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  • Location
    USA, Pennsylvania, Susquehanna Cty, Forest Lake
  • Interests
    Canoeing, woodworking, electronics, and gardening.
  1. how to design a battery jack for unknow phones

    Your " unknown phone " is unknown to us also. One photo is worth a thousand words, two photos are worth two thousand words, etc
  2. 12 volts dc motor

    You need to define this so someone can help you.
  3. Transformer Watts

    The power required by the charger would be in the order of: 120 * 0.3 = 36 watts. The 220/240 To 110/120 Volt European Socket Power Converter Step Down Transformer off ebay.com are rated 100 watts and not expensive. Order one directly from China; it's just up the big pond from you
  4. Transformer Watts

    I enlarged the image off the Amazon.com but could not read it https://www.amazon.com/Black-Decker-LCS1620-Lithium-battery/dp/B01M6TQPY2/ref=sr_1_3/141-0275392-4037060?ie=UTF8&qid=1499813460&sr=8-3&keywords=Black+%26+Decker+LCS1620 ...but ebay.com has a readable image http://www.ebay.com/itm/Black-Decker-LCS1620-20v-20-Volt-Lithum-Ion-Battery-Charger-NEW-/272090041874?epid=1640405275&hash=item3f59d48e12:g:mf8AAOSwawpXr3eh 120v @60hz 300ma
  5. EPCS4SI8N datesheet

    " which one is right? " What two are you comparing?
  6. Carbon Composition Resistor ID

    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!
  7. Help microcomputer

    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.
  8. 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.
  9. How about the LP3856 ?

    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?
  10. 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.
  11. "50Pcs NPN Transistor TO-92 2N2222A 2N2222 Brand New Practical High Quality" (Ebay) Does "Practical High Quality" mean hfe's of almost 100
  12. 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.
  13. Current problems of TIP122

    You may wish to look at: Using the TIP120 & TIP125 Darlington Transistors with Arduino https://www.youtube.com/watch?v=wxCJ9NUErwA
  14. Parts suppliers

    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
  15. Parts suppliers

    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