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  1. dave9

    Edifier X600 speaker circuit burnt components identification

    I almost didn't notice the link and thought attached pics were missing. I don't see anything wrong, just some old darkened brown cement holding the capacitors down. There is one hairy looking spot to the top left of the capacitors but I can't tell if there is any problem there with that...
  2. dave9

    Solar alarm clock dead(?)

    Yes, on both sides of it. You'd want to do this with the solar cell covered so light doesn't get to it, and next you might want to test again with strong light getting to it, in case the solar cell is the fault, no longer charging it. The thin blue rimmed battery is probably NiCd, probably...
  3. dave9

    Li-Ion battery: Too much voltage?

    Yes an off the shelf hobby charger can do single series of cells one series at a time then wire in parallel later, except you still have the issue of terminating discharge when any cell drops too low, but this is an issue even with a single series of cells. For this reason I would not get...
  4. dave9

    Li-Ion battery: Too much voltage?

    I suspect that if you have already tested your custom PWM with the intended battery and the motor works as intended, that it will work acceptably with the 14.(n) Li-Ion battery, but that you risk overheating it if you run at full throttle, with the PWM controller, or especially without it since...
  5. dave9

    Terminals and Connector Sizes

    ^ Or drill or file out the ring hole if it's slightly undersized. Not really sure why this topic exists, anyone can just go to Digikey.com etc and pick the dimensions they need. Terminal strips practically always use a standard size which in this case means standard or metric screw # to...
  6. dave9

    Philips 40PFL3008T wont turn on

    Is there any chance the firmware update portion of the new firmware is viable, that if you repeat the update process with the old firmware (whatever you can find if all else fails) it might be able to downgrade back to that? However not having the standby light on seems fishy. Before I threw...
  7. dave9

    Dimming an over bright LED

    Yes you can put a resistor in parallel to dim the LED but there is seldom a good reason to do so since it just wastes power that you wouldn't otherwise waste using just a single resistor in place of the existing resistor, either to limit current to the LED more if existing resistor is in series...
  8. dave9

    Terminals and Connector Sizes

    Tinning the wire has never been a problem for me, but with one crucial detail. The fastener MUST be torqued enough (more than usual) to pre-deform the solder until it is the wire copper itself bearing the load. This pre-flows the solder and there is no margin left for it to go anywhere and...
  9. dave9

    How do digital sewing machines fail? Is there often a visuall clue on the circuit board?

    Appliance circuit boards is a category too broad to generalize about. Some appliances may stay always powered and be more subject to AC power line surges. Some handle water or cooling/condensation and could have eventual water damage. Some heat up so eventual heat damage. Some are just made...
  10. dave9

    Is MW LRS 100-24 a good power supply? + possible leakage solution question

    Are you going to be using this budget grade soldering iron constantly enough that efficiency makes a difference? Most low cost stations use an old school line isolated transformer not a switcher then earth ground the shaft/tip. If it has its own temperature regulation then you probably don't...
  11. dave9

    integrated amplifier

    By running it till it gets hot(ish) to see if the temperature rise causes any cracked solder joint, brittle component like something surface mount, or PCB trace to break the circuit.
  12. dave9

    bending leads on IR transmitter,is it bad?

    You can often throw a red LED into the circuit in place of the infrared so you can visually see that it's lighting (circuit doing at least that much).
  13. dave9

    Is it worth it for 35 watt machines to have an anti-static mat?

    Your pictures show a metal cart. Assuming it is bare metal, you don't necessarily need to add an anti-static mat to bare metal, just can't put anything insulating between the equipment and the metal (and similarly cannot put anything insulative between the equipment and an anti-static mat)...
  14. dave9

    Which LED do I need?

    ^ ?? It can't have been installed the wrong way round (wrong polarity?) as it would have never worked, or did you mean that you put a replacement in and it didn't work, hence this topic exists? LEDs do dim over the years but this is usually when they're driven higher than a couple mA. I've...
  15. dave9

    Which LED do I need?

    It seems unusual that a 3mm LED driven at 2.7mA would fail. Are you sure the LED is the fault? I'd sooner suspect a cracked solder joint or ???
  16. dave9

    Frigidaire CFMV164LSA over-the-range microwave capacitor location

    You should be fine using a plastic brush, or just start taking screws out so you can disassemble it further to see how bad it is inside. Keep in mind that the majority of the gunk you see is probably grease pulled up from the vent hood function (assuming it has one) and so just the bottom and...
  17. dave9

    Frigidaire CFMV164LSA over-the-range microwave capacitor location

    Are you sure you shared those pics publicly? The link takes me to a page with no pics just states "Zoinks! You've taken a wrong turn" The metal body of the capacitor is always safe to touch, it's the metal contacts at the top and the other ends of the wires that shouldn't be touched. How...
  18. dave9

    Best soldering technique to prevent component heating?

    If by "solid rosin core" you mean just the crunchy rosin itself (or waxy if just enough solvent to make a paste), you can make that into a solution using alcohol then apply using a squeeze bottle with a fine tip. Adjust the viscosity of the flux to suit the tip of the bottle you want to use...
  19. dave9

    Best soldering technique to prevent component heating?

    If a component lead is stubborn and takes longer than expected, I'll wait several seconds for the heat to dissipate before soldering the remaining leads. Vintage parts, sometimes with NOS (new old stock, and keeping ESD in mind) I see that the leads have turned dull gray and then I'll wipe the...
  20. dave9

    Frigidaire CFMV164LSA over-the-range microwave capacitor location

    ^ The hydrochloric acid mentioned will react with aluminum... "Severe Effect" on the following chart which also lists some other chemical incompatibilities including common household cleaners like bleach and vinegar: https://www.calpaclab.com/aluminum-chemical-compatibility-chart/
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