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About HarryA

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    Advanced Member
  • Birthday June 23

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  • Location
    USA, Pennsylvania, Susquehanna Cty, Forest Lake
  • Interests
    Canoeing, woodworking, electronics, and gardening.

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  1. One can go from 50hz ac to 12 vdc via battery charger then from 12 vdc battery to 60hz 120v via a dc to ac converter. see: https://www.bing.com/videos/search?q=50hz+to+60hz+converter&&view=detail&mid=3D9219028DABBB0162A53D9219028DABBB0162A5&&FORM=VDRVRV&ajf=60
  2. Hello, I would think few of us would know anything about mig welders. I gather you want to hot switch the current from the mains to the welder. What current does your welder draw would be a start. You may need a high current relay to do the switching. Like? https://www.grainger.com/product/5ZH38?cm_mmc=PPC:+Google+PLA&s_kwcid=AL!2966!3!166591437759!!!g!81032003877!&ef_id=WqqIQwAAAacd4m57:20180315145043:s It's rated "AC contract rating - relay: 25 amperes at 240 volts ac." You need a relay rated higher than it draws off the mains because of the inductive load - I gather the mig welders have a transformer at the input like an arc welder?
  3. HarryA

    Practical use of voltage divider

    How about 3 terminal adjustable voltage regulators? see for example: https://www.mouser.com/ProductDetail/ON-Semiconductor-Fairchild/LM317AHVT?qs=%2fha2pyFadugRpOCsw7uJG%2fYkcWjLe5SQfHkipQZSRvGAuHf8Q8Z20lpgQCwyK1vllMxUP7WNhWIGj0RAnAK1dQ%3d%3d 60 volts max and 1.5 amperes. Poke around at Mouser for higher current ones also. There are filters on their site that are helpful.
  4. HarryA

    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
  5. HarryA

    12 volts dc motor

    You need to define this so someone can help you.
  6. HarryA

    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
  7. HarryA

    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
  8. HarryA

    EPCS4SI8N datesheet

    " which one is right? " What two are you comparing?
  9. HarryA

    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.
  10. 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.
  11. HarryA

    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?
  12. 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.
  13. "50Pcs NPN Transistor TO-92 2N2222A 2N2222 Brand New Practical High Quality" (Ebay) Does "Practical High Quality" mean hfe's of almost 100
  14. 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.