Search:

Type: Posts; User: FvM

Page 1 of 20 1 2 3 4

Search: Search took 0.34 seconds; generated 43 minute(s) ago.

  1. Replies
    20
    Views
    368

    Closed: Re: 230VAC PWM LED bulb dimmer

    If it's dimmable LED, what's the specification? Typically they use trailing edge phase control.
  2. Replies
    20
    Views
    368

    Closed: Re: 230VAC PWM LED bulb dimmer

    You can alternatively drive the 555 charge/discharge resistors by OUT pin, leaving DIS pin unconnected.

    Some flickering can be expected due to 500 Hz pwm running asynchronous to 50 Hz mains.
  3. Replies
    20
    Views
    368

    Closed: Re: 230VAC PWM LED bulb dimmer

    It doesn't actually matter in this case, but your gate drive power calculation is completely wrong. Neither gate Iavg nor Irms is significant, instead you'll put in Qg*Vgs as energy consumed per...
  4. Closed: Re: Freq computation without DIV instruction for 8bit MCU

    If you perform only 1 measurement per second, 40 µs division time (0.004 %) would be absolutely no issue. But I guess 1 Hz is too slow. For reasonable measurement rate and resolution, you are tied to...
  5. Replies
    4
    Views
    131

    Closed: Re: Best isolated or differential scopes/probes

    I haven't yet found a differential probe that is suitable for measuring high side gate voltage without huge common mode crosstalk. I didn't yet check the PMK "BumbleBee" 400 MHz probe, but from CMRR...
  6. Replies
    4
    Views
    131

    Closed: Re: Best isolated or differential scopes/probes

    For the said measurement application (high side gate voltage), you need really high CMRR and a probe design that doesn't send common mode currents down the probe cable.

    The Tek optically isolated...
  7. Replies
    11
    Views
    369

    Closed: Re: Addressable speaker system

    I agree about using RS-422 or RS-485. It can work over many km in a party line topology with correct end termination.

    I'm however surprised that you are planning 200 m regular speaker cable,...
  8. Replies
    5
    Views
    187

    Closed: Re: Step Cieling fan regulator using Triac

    What's the opto triac type?

    I suggest an RCR filter/snubber circuit like below to prevent parasitic triggering. R2 can be reduced to 50 to 200 ohm to make the circuit work as a snubber for the...
  9. Replies
    5
    Views
    187

    Closed: Re: Step Cieling fan regulator using Triac

    Suggest you get self-triggering of opto triac or main triac by high dv/dt. That's likely to happen with inductive load, RC filters for the opto triacs are suggested. Refer to application circuits for...
  10. Closed: Re: Configuring ICE40 FPGA directly from ESP32 uC rather than using dedicated flash I

    "Slave SPI mode" in the configuration manual refers to operating the uC as SPI master and ICE40 as slave which is most likely the easier way.
  11. Replies
    1
    Views
    108

    Closed: Re: Seeking wiring advice for Wifi router

    You are apparently misunderstanding things. The WiFi adapters have two antenna ports for diversity purposes, each coax cable will be connected to a reverse SMA jack and an antenna. If you have only...
  12. Replies
    9
    Views
    412

    Closed: Re: Oscillations dying out

    1. You can verify by checking the loop gain.
    2. Choose initial conditions that result in a start magnitude below steady state. You'll see a rising magnitude at the start.
  13. Replies
    9
    Views
    362

    Closed: Re: L1 and C1 value for EMI filter design ?

    As explained by cariban, C1 and L1 aren't directly related, respectively there's no formula linking the values.

    For L1, I would use a low current common mode choke like this...
  14. Closed: Re: Remove glitches in output frequency of ring oscillator

    What we see in post #1 is not jitter. It's an unstable oscillation mode.

    Apart from the question it's a real hardware effect or a simulation artefact, what's the purpose of increasing the number...
  15. Replies
    9
    Views
    362

    Closed: Re: L1 and C1 value for EMI filter design ?

    Why 4.7 uF, why not 47 nF or 470 nF? You didn't yet specify any application parameters.
  16. Replies
    17
    Views
    846

    [SOLVED]Closed: Re: LoopGain analysis with multiple feedback loop

    Sure, due to series-shunt feedback working.
  17. Closed: Re: LLC converter vs Dual cascaded Buck….1000V to 48V at 500W output…no isolation ne

    The current spikes are caused by D3 snap-off. The diode is completely useless.
  18. Replies
    6
    Views
    213

    Closed: Re: push pull ac-dc auxiliary winding.

    Yes, that's what Easy peasy suggested.
  19. Replies
    6
    Views
    213

    Closed: Re: push pull ac-dc auxiliary winding.

    Using the winding only to power the feedback opto coupler doesn't make sense.

    But I presume you can read schematics good enough to see that the driver power supply is not shown in the drawing....
  20. Replies
    1
    Views
    267

    Closed: Re: 10Gb/s data over gigabit Ethernet port

    No. MAC and PHY must be designed for 10 Gbps.

    10GBASE-T (10 GBPS ethernet over RJ45 cables) hardware is yet expensive. Unlikely to be found in a garden-variety PC.
  21. Replies
    9
    Views
    362

    Closed: Re: L1 and C1 value for EMI filter design ?

    It depends. On the interference frequencies to be filtered, the device power, etc.

    C1 47nF up to several µF
    L1 is sketched as a common mode choke, common mode inductance 100 µH - several 10 mH,...
  22. Closed: Re: Remove glitches in output frequency of ring oscillator

    It's usually expected that a RO oscillates at the lowest possible frequency with a period equal to twice the gate chain delay, without a frequency selective circuit.

    I'm not sure if the assumption...
  23. Replies
    6
    Views
    307

    Closed: Re: Wht is the purpose of this op amp

    You know what the load impedance is, we can't determine if the lower driver impedance is actually necessary.
  24. Replies
    3
    Views
    272

    Closed: Re: How can I measure the Side-Band Amplitude?

    You can either calculate the side band to carrier magnitude ratio based on the used modulation index or measure the magnitudes with a spectrum analyzer. Modulation index is different for 106 kbps and...
  25. Replies
    11
    Views
    374

    Closed: Re: Microcontroller selection - higher baud rate

    You might look for newer 18FxxKyy series that can achieve 64 MHz clock with internal oscillator and PLL. They support 115k or even higher baud rates. Please consider that internal oscillator has...
Results 1 to 25 of 492
Page 1 of 20 1 2 3 4