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  1. dorke

    Cheapest tool to measure Total Harmonic Distortion

    CFL are a known noise source. They employ a noisy internal switching inverter . You where brave enough to try the furnace with the generator, Luckily without damage.;) So, you don't have a solution for operating the furnace in the case of a blackout(maybe a better and more expansive...
  2. dorke

    Cheapest tool to measure Total Harmonic Distortion

    You did fine. Both gen. look the same in no load (idle). They have this just under 2KHz(and harmonics at 4Khz,6khz ) spectral noise which disappears with higher loads. That is a bit of a puzzle to me. The CFL looks like the idle case(it is a very small load), but adds just a bit more spectral...
  3. dorke

    LED stays on when it shouldn't. pulling my hair out.

    What kind of meter are you using? As far as I know meters show open circuit (or O.L) only in the resistance range. So looks like you are not measuring voltage. Anyways do this: connect the resistor as shown and repeat the measurement(pins 2 to 6 voltage).
  4. dorke

    LED stays on when it shouldn't. pulling my hair out.

    Please measure the voltage in the fading state , like you did in the charging state.
  5. dorke

    Thermocouple RF Ammeter

    @hevans1944 , I have never seen one such RF ammeter before. It brings up the question what good are they for? My answer,not much... Maybe it was good for something in the 1920's when RF was something like 1Mhz and below. Today we never care about "RF amps" . We do care about "RF power" and that...
  6. dorke

    LED stays on when it shouldn't. pulling my hair out.

    Welcome to EP, Please measure the voltage between pin-2 and pin-6 of the PSC, with the led fully on and dim
  7. dorke

    Oscilloscope Help

    I wouldn't go this way at all. The standby current of remote controls is sub-mA you wouldn't be able to see any change in the Battery Voltage with a scope. What you can do is use a sensitive Ampere-meter(μA). If you don't have a digital one, you can use an old analog Ampere-meter or just a...
  8. dorke

    Harmon Kardon HK 395 PC Speakers

    It is probably a mere setup of your PC. Use the "Sound and audio devices" in the "control panel" to set it up.
  9. dorke

    need help with an amplifier

    Welcome to EP. "Input Vrms is 7.07 and output Vrms is about Vin*100" That is a bit of a miracle using VCC=12V... Also, the re and rc seem low values. How did you calculate the gain?
  10. dorke

    Substitute for ELNA capacitors

    I looked at the Elna catalog ,couldn't find any RJG or RJX series. Are you sure you got those correct?
  11. dorke

    Cheapest tool to measure Total Harmonic Distortion

    The last signal looks like it is a 3 level MSW(Modified Sine Wave / Pseudo Sine Wave) inverter. The THD is very high at 26%. I wouldn't recommend that for "sensitive" electronic equipment. Motors do run hotter and nosier with them. Control boards may run faulty and even be damaged by them. You...
  12. dorke

    oticon streamer battery replacement

    Can you get the manufacture name and it's part number from Oticon? And maybe a place to buy it(without service).
  13. dorke

    Finding the smallest possible actuator, or a new solution. Help massively needed!

    LOL, Your story reminds me of " How the Rhino got is skin" by Kipling. kinda , tickle me Elmo and a 3 button "skin remover":)
  14. dorke

    When Measuring Watts...

    P.S Another thing to take into account is the AC Line voltage tolerance. If I am not mistaken,in the US it should be 120VAC±5% so 114-126VAC. while measuring the above , measure the line voltage ACV(on a high scale voltage) and compensate for the worst higher case of 126V. e.g say you measure...
  15. dorke

    When Measuring Watts...

    If you wont to get a more realistic result do this: 1. Connect a load that will draw 1A(or 1.4A) from the unregulated DC voltage(measurable with a series Ampere-Meter) . 2. With this load measure the unregulated DC voltage and use that instead of the 16V no-load voltage in your formulas .
  16. dorke

    Opamp vs Comparator

    Most comparators(like the LM339) have an open collector output. i.e they can sink current in the output low state. If you need the "inverse logic operation" simply replace the input comparison(+) and (-) pins. you will need a pull up resistor on that open collector (10K ohm or so). If you need...
  17. dorke

    How to use PH module with Arduino

    Welcome to EP. You should get the "user manual" for it. Contact the seller or the manufacture for details.
  18. dorke

    oticon streamer battery replacement

    Welcome to EP. Here ,they should help.
  19. dorke

    J Type Thermocouple Signal Conditioning

    Sounds like Homework to me. You should sweat it out yourself, then come with specific questions.
  20. dorke

    Repair UPS Santak

    Maybe this can help. What is the model number?
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