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  1. Ylli

    What's the function(s) of the extra contacts on so many cellphone's batteries?

    Recycle all these batteries and buy the proper one with the proper charger. Otherwise, you are asking for catastrophic battery failure and perhaps a fire. Li-Ion batteries are not something that can be charged/discharged willy-nilly.
  2. Ylli

    Vacuum Cleaner Problem

    How low does the voltage drop just before it shots off? The inductors on the motor are for reduction of electrical noise.
  3. Ylli

    Need help understanding this circuit

    470 nF = 0.47 uF
  4. Ylli

    Capacitor Help

    MEASURE THE VALUE OF RESISTOR R104! Yes, I'm yelling. Use your soldering iron and lift one end of R104. Then set your Digital Multi-meter (DMM) to the ohms range and connect one test lead to each end of R104. Report what the meter reads. If it reads 10 ohms, reinstall it and make the...
  5. Ylli

    Comedy Thread

    Credit: Mike Rowe FB post
  6. Ylli

    Capacitor Help

    As a start, you need to measure the voltage at collector and emitter of Q112, the voltage across D105, and the voltage at the emitter of Q111. And measure the resistance of R104. Then we can suggest possible defective parts and a path to proceed. Randomly changing the cap is not going to be a...
  7. Ylli

    Capacitor Help

    While you are there, also check and confirm R104 is actually 10 ohms, and has not gone high.
  8. Ylli

    Yamaha RX-V2400 not turning on or doing anything

    Confirm +8.5 volts on the emitter of Q1 (or anywhere along that path). Then confirm the base of Q6 goes high (>0.5V) when you try to turn it on.
  9. Ylli

    Motorola SS1237 Transistor

    Where is this from?
  10. Ylli

    Found problem in Kenwood KR-V95R

    https://www.hifiengine.com/manual_library/kenwood/kr-v95r.shtml You will need to sign up, but have never received any spam from them.
  11. Ylli

    Found problem in Kenwood KR-V95R

    Yup, definitely leakage. Parts in question are on the schematic pdf page 34 of 54.
  12. Ylli

    Found problem in Kenwood KR-V95R

    Are you sure it is leakage and not just the glue the factory uses to stabilize these larger parts? If the caps are not bulged and the 'leakage' is hard and dry, it is probably glue. I wouldn't suggest getting those Chinese caps anywhere near the unit.
  13. Ylli

    Microwave cooling fan help

    Found the thread I was thinking of: https://forum.allaboutcircuits.com/threads/microwave-fan-and-voltage-rating.155610/
  14. Ylli

    Microwave cooling fan help

    There was a thread either here or on another forum and it was determined that the third terminal on the fan motor was often used to drive the turntable motor (or was it the lamp - anyway...). The fan coil acts not only as the field for the motor but also as a transformer to reduce the voltage...
  15. Ylli

    Microwave cooling fan help

    You're giving us zero information to go on. What microwave did it come out of? Part number of the old and replacement parts? Pictures?
  16. Ylli

    Next Smoke Detector Millionaire or Not?

    https://www.kidde.com/home-safety/en/us/products/fire-safety/combination-smoke-co-alarms/
  17. Ylli

    Next Smoke Detector Millionaire or Not?

    There are smoke/CO detectors that are hard wired into the buildings power, right?
  18. Ylli

    Common Emitter Amplifier - Class B

    I do believe this is what I have been saying all along. In the appropriate application, a singled ended class B stage works just fine. (it can be argued that the image posted here, with zero bias, is actually class C since conduction angle is <180°)
  19. Ylli

    Common Emitter Amplifier - Class B

    Bertus, I am a bit surprised at your answer. 99% of this article is about audio applications. The only quick mention of RF is under the Class C heading. Once again, I am not disputing the fact that for audio applications, class B requires two devices. My posted circuit is not an audio...
  20. Ylli

    Common Emitter Amplifier - Class B

    Useful to you or not, that *is* the definition. Apples and oranges. The amplifier classes are defined with sine wave inputs. For what you describe, you are not using an amplifier, you are using a switch.
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