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  1. dave9

    Modify Doorbell Receiver to run off 5v supply

    Power it up and measure the voltage at the transformer output. If that's pretty near 5.0V you can put the 5V input there and take the transformer off the board, or cut the trace from it to the capacitor(s) after it and put the 5V input at the capacitors.
  2. dave9

    Low Voltage Li-on battey 18650

    3.6V is the nominal voltage rating, not full empty which is closer to 3.0V. Many manufacturers specify even lower than that, around 2.x V (2.5V, etc). If you can determine the manufacturer then get the datasheet to see the minimum safe discharge voltage they specify. The 2.7V cells are...
  3. dave9

    Repair electric kettle (Klarstein) - broken power switch

    I don't really know what I'm looking at, besides it looking like they built the switch from scratch. I'd solder that together and put a hole in the base for a panel mount switch to replace it, one with a phenolic resin body instead of plastic so it has the needed temperature resistance... or...
  4. dave9

    Milwaukee Super Sawzall Intermittent Stopping

    ^ You have described one possible failure mode, then assumed parts were too expensive, and now assume not available when it may merely be a matter of searching a bit longer, "IF" it's a hard to find part, "IF" any part at all needs replaced. If you would rather not repair tools then it seems...
  5. dave9

    Milwaukee Super Sawzall Intermittent Stopping

    ^ Cart before the horse? He came here looking to fix it and the next step is to determine what's wrong, THEN see if the part (if any needed) is available... not so different from fixing anything that uses unique parts. In this case, it really is worth fixing (if possible) as it's not some...
  6. dave9

    Milwaukee Super Sawzall Intermittent Stopping

    ^ I doubt a new one would cost less than parts. This is a high end contractor brand saw that, in today's equivalent model, would probably cost close to $200. For example a $10 switch, $3 brushes, or $50 armature, except that in in a brief look, I didn't find anyone who still stocks the...
  7. dave9

    Is there a modern version of HT-12E and HT-12D?

    You will probably find that the RF modules are cheaper on ebay than on an electronics supplier's website, whether cheapest from a Chinese seller where you wait a month for it to arrive, or an importer that has stock in the US for faster delivery for a few dollars more. That's what I'd do then...
  8. dave9

    What?! Being put on the sidelines is a good thing?

    Being put on the sidelines is a bad thing for a player, but it is the closest to the game you will get if a spectator. You won't see the game nearly as well as sitting at home viewing a big TV, but you will be in an exciting position if you want to see the players close up. For any radio...
  9. dave9

    Resistor for motor to slow speed..

    What is the application? Considering a few hundred mA consumption, I'd sooner switch to a series of AAA cells to reach a target voltage instead of a typical 9V battery which has what, around 320mAh?
  10. dave9

    REPAIR HELP: Philips Speaker System 2.1 SPA2360/17

    If you get really bored you might see if you can hold a soldering iron on the leg of the ferrite bead, wait for it to degrade the epoxy, then use a couple pair of pliers to pull the lead out so you can stuff a new wire through. Worst comes to worst, you have wasted two minutes and will have to...
  11. dave9

    ZOTEK ZT102 Multimeter.

    ^ Yeah you never know with items like this. Could be that whoever makes it for Anang, is still making it exactly the same for everyone, OR they lowered the quality for some, or lowered the quality for all including Anang, with a later build version optimized towards lower cost, and if that's...
  12. dave9

    Limiting resistor for High Power LED

    If you really want to get this dialed in right, the easiest way to do that is to use a variable voltage PSU, and a multimeter in series to the LED, so you can see what the current is at any particular forward voltage. This is just PSU to LED connection, no driver or resistor. You should start...
  13. dave9

    ISO amp that drives the old JBL's 100's-I

    I question your timetable, there were plenty of transistorized amps by the time those came out.
  14. dave9

    ZOTEK ZT102 Multimeter.

    The linked article reads So, probably the exact same meter except for the name printed on it.
  15. dave9

    ISO amp that drives the old JBL's 100's-I

    You could run JBL 100's off a little 1 watt amp. It just depends on how loud you want them. yes 100 WPC is enough to cause you hearing loss. Is that your goal? ;) The thing is, get good speakers. Get an amp suitable for the size of the room and volume needed. You absolutely positively do...
  16. dave9

    Water Damage on Keurig 2.0 Plus

    You are doing a very bad job of systematically describing what went wrong when, but briefly two of the most common faults are that silicone tubing to the heating element got brittle and cracked, which would cause a leak, and that the thermal fuse to the heating element stopped resetting itself...
  17. dave9

    12v relay staying on

    I could be making no more than a random guess but that guess would be that your high-low beam mechanism has worn out and is passing enough current through the high beam circuit when off to still activate the relay. Keep in mind that what you have done is probably not legal. High beams are for...
  18. dave9

    Help with Crosswalk Signal - Man Lights Up. Hand Does Not.

    Did you buy this new, guaranteed working or reject due to failure or? I'd guess there are LEDs in series for the part not lighting up, due to a failed LED, or broken solder joint. Being new to electronics, it seems you have bitten off more than you can chew. Even someone new, should first...
  19. dave9

    REPAIR HELP: Philips Speaker System 2.1 SPA2360/17

    Map the pinout of that IC, the function of each pin based on the circuit leading to it, and measure the supply voltage getting to it. This will tell you whether you can just drop in something like TDA2030.
  20. dave9

    Hammond Gaining Access To Key Contacts

    I would start by taking the screws out and popping the case open. The keys are probably hinged on the chassis or a frame and the circuit board with the switches may separate away from the mechanical assembly.
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