Forum Topic

Ask Sir Tony - an Electronics/Electrical Q & A thread

  • hello

    do you guys know what these things are called (the black spongey material the red arrows point to)?
    reference image:



    i tried looking for thermal pads but i was given a different material

    i need to replace specifically that on my laptop's heatsink as when I previously cleaned it before I thought it was dust buildup (silly me, but they really looked like dust the first time i cleaned it in 5 years) so i intentionally scraped them off :(

    anyways thanks in advance

    -- edited by sylphunter on Jul 20 2017, 11:46 AM

    -- edited by sylphunter on Jul 20 2017, 11:47 AM

    -- edited by sylphunter on Jul 20 2017, 11:48 AM
  • ^
    They're bits of adhesive-backed foam used to seal the gap between the fan and the heatsink's cooling fins.

    I haven't found anything readily available that could be used as an exact replacement; I use some aluminum foil tape.
  • @statix

    Thanks sa tip. Anong brand ang gamit niyo sir?
  • do you guys know what these things are called (the black spongey material the red arrows point to)?
    reference image


    You can use adhesive foam sealers ( for aircons). I bought mine at ace hardware before when i sealed my windows and doors Yung pinakamanipis cost around 400 or 500 pesos.

    -- edited by gaLj on Jul 20 2017, 02:52 PM
  • trebor11584 Send Message View User Items on 20 Jul 17 @ 02:15 PM #
    @statix

    Thanks sa tip. Anong brand ang gamit niyo sir?


    ng transformer? limot ko na kasi wala na yung markings ng transformer sa tagal ng pag gamit.
    hanap ka na lang sa ace or handyman. maraming magandang brands na pagpiliian doon.
  • @gaLj
    You can use adhesive foam sealers ( for aircons). I bought mine at ace hardware before when i sealed my windows and doors Yung pinakamanipis cost around 400 or 500 pesos.


    thanks for the tip sir
    at least i'm sure now na meron sa Ace Hardware

    based kasi sa google research ko kahapon "Urethane Foam Tape" ata yung pinaka closest material sa kanya. 3M lang yung nagmamanufacture and pag nagsupply sila is by bulk. No direct consumer hehehe
  • ano ang maximum Kw per month para sa residential line? Meralco kami
  • 450KW/h?


    mga magkano po sa kuryente yan per day?
  • guys ano po bang pwedeng gawin dito, nung monday nagstart magpawelding ng gate yung kapitbahay namin. may 2 desktop ako tapos parehong pitik ng pitik yung avr everytime na ginagamit welder ng kapitbahay. may kalakihan yung welding machine nila mga 3ft length x 2ft height.

    yung main cpu ko with seasonic psu and panther avr eh buhay pa naman so far, yung nakalagay sa izuki avr with hp psu eh biglang bumigay kahapon. kung mag-on man mamamatay din after a few sec. sinwap ko yung working seasonic psu ko dun sa hp desktop pero di rin nagpower so tingin ko either board or cpu ang nasira.

    pinatignan ko na sa meralco at wala naman short or sira sa linya namin. yung pagwelding lang talaga ng kapitbahay ang naging problema.

    balak ko magcomplain sa baranggay at pabayaran yung pagpapaayos nung isang desktop. need po ng input/opinion nyo kung may habol ba ako dito, si kapitbahay kasi dinadahilan nya na wala silang pagkakamali at dun naman sila sa linya nila ginamit yung pangwelding.
  • you need a capable surge protector. yung surges eh caused by welding machine. mahirap i-complain yan kasi separate meralco meter kayo. also yung AVR mo is relay type.. pag pitik ng pitik yan.. yung AVR mismo ang nagbibigay ng surges. pwedeng AVR mismo mo, ang sumira ng PSU mo.

    nung nirelease ng publisher ang schematic ng relay type AVR, nagwarning sila don na not to be used for computers and those with microprocessors. dapat AVR mo is servo type.
  • ok noted sir, going to shop for servo avr.

    paano kaya to, hindi ko alam na masisira pc ko dahil nga may avr kaya nagkampante ako though nakita ko na nagsusurge. sabi nga ni misis bakit hindi ko agad sinabihan yung nagwewelding.
    fyi monday sila nagstart magwelding pero tulog ako maghapon kaya di ko pa alam nun, tuesday ng hapon ko na lang nakita na sumasabay yung surge sa welding at bumigay yung isang pc after 2hrs.

    yung kapitbahay naman eh hindi rin alam na makakasira sila ng gamit ng iba sa paggamit ng napakalakas na welding machine.

    any ideas na pwedeng makatulong para makakuha ng compensation? o charge to experience and wallet na lang to?
  • yung kapitbahay naman eh hindi rin alam na makakasira sila ng gamit ng iba sa paggamit ng napakalakas na welding machine.

    di mo pede icomplain yan. kasi separate meralco line kayo.

    problem kasi sa wiring ng pinas.. walang ground wiring... kung nakaground yung mga PC mo, possible na di ka maapektuhan ng surges ng mga kapitbahay.

    if you look closely, pagbili mo ng mga appliances, usually me green wire na nakakabit sa housing ng units.. like sa likod ng refrigerators, washing machine, microwave ovens. purpose non is for grounding.. para in case me dumating na surges, madadivert yung surges to ground.

    but then again, di kasi uso sa pilipinas ang ground wiring.
  • thanks for your input sir. kahit parents ko sinasabi gulo lang daw papasukin ko.
    yung kapitbahay pinagsarahan lang ng gate si misis nung pinapunta ko sya at ipaalam yung nangyari sa pc ko. sinabihan lang sya na sa linya naman nila sila gumagamit.

    btw yung avr di po ba may surge protection na rin syang feature? dapat pa rin ba ako bumili ng separate surge protector? ano mairecommend nyo na servo avr? yung matibay sana pero di kamahalan. salamat po ulit.
  • walang surge protection ang AVR/

    actually, waste of money ang AVR, kasi PC power supply can handle +/- 30Volts variation sa AC supply. gagamit ka lang AVR kung talagang mataas ang swing ng kuryente sa area nyo. malalaman mo yan thru analog multimeter or kung palagi lalakas then hihina ang electric fan mo.

    for PC protection, surge suppressor talaga kelangan mo... pero US made surge suppressors like Belkin, kelangan mo ng ground wiring... kasi sa ground wiring dinadivert ang surges.

    kung bibili ka ng surge suppressor like Belkin, pagawa ka ng ground wiring para effective ang surge protection.

    merong nabibiling surge suppressor naman, no need for ground wiring.. they have metal oxide varistor inside.. pag nagsurge, masusunog ang varistor at magshoshort.. puputok ang fuse to protect your unit from surges. Sacrificial surge suppressor yung mga ganon. Pag nagwork, masisira ang varistor.... then you need to replace varistor or the surge suppressor unit itself.

    UPS naman merong built in surge suppressors... kaso you need pa rin ground wiring to divert surges. pag walang ground wiring.. nagiging sacrificial ang UPS.. masisira sya to protect the unit connected to it.
  • ok kung hindi po pwede ground wiring, bale surge suppressor at UPS dapat? anong gagawin ko dun sa mga avr para hindi naman masayang kung sakali? pansamantala pwedeng surge suppressor at avr muna?

    saka wala pa akong budget para sa UPS at upgrade na lang gagawin ko dun sa nasirang pc imbes na palitan yung damaged part lang.

    edit. parang may nabasa ako sa ibang thread na may mga surge suppressor na mahinang klase daw. ok kaya yung omni surge suppressor? nakikita ko to madalas sa handyman at ace.

    -- edited by Scout528 on Aug 11 2017, 02:41 PM



  • Mahirap bang iconvert para palagi syang naka-on pag saksak ng adapter?

    Ganun kasi kailangan ko at nagkamali ng bili. Ilalagay ko kasi sa di masyadong accessible na lugar at on/off lang using wifi controlled socket. Ngayon kasi kailangan pang ipress para mag-on

    -- edited by aouieboy on Aug 11 2017, 11:29 PM

    -- edited by aouieboy on Aug 11 2017, 11:35 PM
  • Hello.

    I need to put an extension cord for my ref.

    I already have a 125V / 15A / 1500W 1 meter extension cord.

    1. Ok lang naman gamitin to sa 220V natin right?
    2. Ok na ba to for a 12 cubic feet inverter ref? Ref specs indicates:
    AC Voltage - 220-240V
    Freq - 60 Hz
    Rated Current - 1.4A
    Defrost Input - 150-178W

    Thanks.
  • ^ I don't see a problem.
  • @awakeruze

    Thanks! Will use it na.
  • Hello.

    Meron akong 3 devices. Eto yung power req:
    Device #1: 5v 2.5a (12.5w)
    Device #2: 12v 4a (48w)
    Device #3: 12v 2a (24w)

    Ang balak ko gamitin na power supply is yung Mean Well RD-125 (http://www.meanwell.com/webapp/product/search.aspx?prod=RD-125):
    - Current range for 5v is 2a to 15a
    - Current range for 12v is 0.5a to 10a

    Ang sabi dun sa spec sheet is "Each output can work within current range. But total output power can't exceed rated output power."

    Yung 2 12v devices ay 6a in total, 72w in total. Tapos yung 5v device is 12.5w. Total of 84.5w for the 3, which is pasok dun sa 125w nung power supply.

    Ang tanong ko is: Tama ba?
  • ^
    Yes.
  • ^
    Thanks!
  • Gud am, question here. Anong klaseng resistor ang kailangan ko to use a 12 volt bulb on a 48 volt power source? Nag try kasi ako mag palit ng turn lights ng ebike kaso napupundi, yun pala 48 volts ang output ng turn lights.

    Pede din kaya mag series ng 4 na 12 volt bulbs?
  • Gud am, question here. Anong klaseng resistor ang kailangan ko to use a 12 volt bulb on a 48 volt power source? Nag try kasi ako mag palit ng turn lights ng ebike kaso napupundi, yun pala 48 volts ang output ng turn lights.

    not exactly an answer tho pero to clarify further lang from your question... I do believe that they're using common 12v motorcycle bulbs (pwede ring automotive/car on rare cases) ang alam ko merong silang circuit or voltage regulator to 12v to the wirings of lights like those DC to DC converters
  • yung binili ko kasing turn lights is pang motor (internal combustion) 12 volts. yung sa ebike naman wala syang step down regulator to 12 volts. gumamit ako ng volt meter to measure the voltage pag naka on yung signal lights.....48 volts max ang reading.
  • yung binili ko kasing turn lights is pang motor (internal combustion) 12 volts. yung sa ebike naman wala syang step down regulator to 12 volts. gumamit ako ng volt meter to measure the voltage pag naka on yung signal lights.....48 volts max ang reading.

    no wonder pundi agad ang motrcycle/automotive 12v lights.... nasa 48v reading niya... kahit doble ang voltage mapupundi agad yun

    so that means yung wiring diagram nila is 12v to 12v to 12v to 12v bulb to 48v battery setup (yun ang suspect ko) =/
  • isang option ko kasi is may wide voltage range led bulb sa lazada, 12 to 80v kaso medyo may kamahalan kaya try ko muna other options ko like 12v bulb + resistor or four 12v bulbs in series.
  • @megasys
    gamit ka na lang ng voltage regulator... LM7812
  • thanks sa info sir, will definitely try that....based sa images na nakita ko (if correct), 3 yung contact points niya......in, ground then out.

    then ang gagawin ko lang is; positive wire of power source > in pin of regulator / out pin of regulator > positive terminal of bulb > negative terminal of bulb to negative wire of power source

    tama po ba?
  • ^
    The LM7812 might not be a good idea, since it's a linear regulator and will emit a lot of heat just reducing the voltage from 48v to 12v.