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HarryA

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Posts posted by HarryA

  5. over voltages or surge voltages

    in High Voltage Stuff

    Posted

    Power Strip with USB, Surge Protector Smart 3 Outlet and 4 USB Port Charger with 5ft Extension Power Cord 1250W 100-240V

     

    https://www.amazon.com/Protector-Extension-100-240V-Portable-Transformers/dp/B07KGPFHYC/ref=sr_1_9?s=electronics&ie=UTF8&qid=1548959567&sr=1-9&keywords=surge+protectors+for+computers

    I worked with a power supply that was 900 amperes and 8 volts; this would not work for that B)

  8. Wanted: Activity Reminder Device

    in Electronic Projects Design/Ideas

    Posted

    I would use an arduino microcomputer with an arduino display shield for the display.

    The best microcomputers are about  22$ down to a few dollars for the ones from China.

    The arduino display shields are around 10$ or so. The Utlransonic distance measuring transducer senors

    are less than 10$; they detect if you are in your seat or not.

    https://www.amazon.com/s/ref=nb_sb_noss_1?url=search-alias%3Daps&field-keywords=arduino+uno

    https://www.amazon.com/s/ref=nb_sb_ss_i_1_13?url=search-alias%3Daps&field-keywords=arduino+ping+sensor&sprefix=arduino+ping+%2Caps%2C215&crid=DDBCCF7NH7CK

     

    https://www.amazon.com/s/?ie=UTF8&keywords=arduino+display+shield&tag=geminipcstand-20&index=aps&hvadid=28314448797&hvqmt=e&hvbmt=e&hvdev=c&ref=pd_sl_83ujuhent2_e

     

  11. Help putting timer on my welder

    in Electronic Projects Design/Ideas

    Posted

    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?

     

     

  16. Transformer Watts

    in Power Electronics

  20. How about the LP3856 ?

    in Electronics chit chat

    Posted

    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?

     

     

  23. Help with High School Robotics Project (for my kids)

    in Electronic Projects Design/Ideas

    Posted

    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.

     

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