Search:

Type: Posts; User: neazoi

Page 1 of 20 1 2 3 4

Search: Search took 0.02 seconds.

  1. Replies
    12
    Views
    1,922

    Closed: Re: USB to PS/2 adapter, how does this work?

    I have 3 of these converters, 2 of them are actually for mouse. They all worked with one of the two keyboards. In the other keyboard none of them worked. If they had a converter inside them, I would...
  2. Replies
    12
    Views
    1,922

    Closed: Re: USB to PS/2 adapter, how does this work?

    I have tested it. I took a USB keyboard that I had connected to a PC through a usb to PS/2 adapter and pluged it in the project. It has been powered up (three leds are on in the beginning and then...
  3. Replies
    12
    Views
    1,922

    Closed: Re: USB to PS/2 adapter, how does this work?

    The purpose would be that every USB keyboard could work in the PS/2 port.
    I wondered so, because if that was the case, then USB keyboards (not-combo) would work in a PC PS/2 but not in my project.
  4. Replies
    12
    Views
    1,922

    Closed: Re: USB to PS/2 adapter, how does this work?

    Well this are great news for the project. If the intelligence is inside the keyboard, then USB keyboards can be used with this project IF they support the PS/2 protocol.
    I guess the simplest thing...
  5. Replies
    12
    Views
    1,922

    Closed: USB to PS/2 adapter, how does this work?

    I have an MCU project that accepts PS/2 keyboard. I want to investigate if I could use USB keyboards as well with it using these USB to PS/2 adaptors.

    I think that the conversion from USB protocol...
  6. Replies
    7
    Views
    510

    Closed: Re: why FM is not used in shortwave?

    I see. It reminds me the digital voice ham radio modes. It uses also multiple carriers. It seems that digital signals go that way (using multiple digital data streams within the same "channel").
  7. Replies
    7
    Views
    510

    Closed: Re: why FM is not used in shortwave?

    Yes I should have corrected the topic title, I meant except CB radio.
    Is DMR FM modulated? I thought it was AM. Something like QASK or similar.
  8. Replies
    7
    Views
    510

    Closed: why FM is not used in shortwave?

    why FM is not used in shortwave?
    This is a long question I have. Whenever I switch the HF radio to FM, AM stations carriers are received more clear. Of course I am only hearing very low demodulated...
  9. Replies
    32
    Views
    1,588

    Closed: Re: HP 54520A Blown Fuse Problem

    I think is is the bridge rectifier. After I deslodered it, no fuse was blown. I have replaced all other parts except the varistor and the fuse was always blown. So it must be the bridge.

    This is...
  10. Replies
    32
    Views
    1,588

    Closed: Re: HP 54520A Blown Fuse Problem

    Hi,
    I have disconnected R12 and Q3 (isolating the input of the PSU completely) and the fuse is still blown.
    So the problem is somewhere on the input side of the PSU.

    Now, I have replaced the...
  11. Replies
    10
    Views
    754

    Closed: Re: Active HF phase shifter?

    I do not mind tuning for this application. But having to change the capacitor for each band is undesirable. Also having to tune both the phase AND the amplitude is undesirable, as it will be too...
  12. Replies
    10
    Views
    754

    Closed: Re: Active HF phase shifter?

    Thanks very much for the interesting simulation and ideas!
    I think I will stick to the RC circuit and try to correct any amplitude difference on later stages by ACG amplifiers or by a level...
  13. Replies
    2
    Views
    262

    Closed: bfq162 pnp comlementary?

    I need to find a pnp complementary for the bfq162 which is to be used in a class-C HF amplifier.
    Is there anyone complementary in the same package?
  14. Replies
    10
    Views
    754

    Closed: Re: Active HF phase shifter?

    What does it mean FvM? That with the values shown it won't have amplitude variations? Wave I understood that right?
  15. Replies
    10
    Views
    754

    Closed: Re: Active HF phase shifter?

    You mean replacing the resistor with an inductor and the capavitor with a variable one?

    How about leaving the resistor as it is and replacing the capacitor with a variable one? This won't degrade...
  16. Replies
    32
    Views
    1,588

    Closed: Re: HP 54520A Blown Fuse Problem

    Ok, but I have replaced these caps with other used ones I had and it still blows the problem. So I do not think this is the fault. But thanks for the hint.
  17. Replies
    10
    Views
    754

    Closed: Re: Active HF phase shifter?

    Thanks. I will give it a try. I thought the potentiometer and capacitor values were calculated for the required phase shift. Ok it is nice to hear that it can work with other values too.
    It will be...
  18. Replies
    32
    Views
    1,588

    Closed: Re: HP 54520A Blown Fuse Problem

    Well, I desoldered Q3 completely. I also desoldered R12. I also changed C22 and C23 with other used ones I had.
    The PSU still blows the fuse. So thankfully I hope it is something in the HV side and...
  19. Replies
    10
    Views
    754

    Closed: Active HF phase shifter?

    This circuit comes from a national semiconductor application note (AN-32).

    Is it suitable for HF usage (1-30MHz)?
    If not as it is, what components values should I change? (I will use a J310...
  20. Replies
    32
    Views
    1,588

    Closed: Re: HP 54520A Blown Fuse Problem

    There is no R13 and R14 in my circuit, instead the line is connected directly to c3. So I think I am going to desolder the q3 as Brian suggested. Maybe disconnect R12 too.
  21. Replies
    32
    Views
    1,588

    Closed: Re: HP 54520A Blown Fuse Problem

    What is the crowbar?
  22. Replies
    32
    Views
    1,588

    Closed: Re: HP 54520A Blown Fuse Problem

    I think I am going to check the mkp caps and the big electrolytics first. First in circuit then desolder them and check their capacitance and resistance with a multimeter. But is would be wiser to...
  23. Replies
    32
    Views
    1,588

    Closed: Re: HP 54520A Blown Fuse Problem

    Always amazingly helpful! :)
    I also suspected the primary side of the PSU. Something overheated, a faulty component that fails after heated, a leaky capacitor, things like this. Problems related to...
  24. Replies
    32
    Views
    1,588

    Closed: Re: HP 54520A Blown Fuse Problem

    I have verified that the main PSU is the problem. I connected the PSU to the mains but disconnected all the output cables from the PSU that power the oscilloscope. The mains fuse still burned out...
  25. Replies
    1
    Views
    178

    Closed: BAT41 cheap diode alternatives

    Hi, I am looking for BAT41 cheap diode alternatives for my charge pumps in this circuit.
    I have put there the 1n5711 and 1n5712. Bur all of these diodes cost about 10 Euros per 100 pieces.
    I need...
Results 1 to 25 of 500
Page 1 of 20 1 2 3 4