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Recent content by FvM

  1. FvM

    Why reactive power is not considered for calculation of efficiency of SMPS?

    You don't pay for conduction losses between power station and your meter, unless you are a commercial customer. Power quality regulations however limit the amount of reactive and harmonic current drawn from the grid.
  2. FvM

    CAN bus accidentally swapped TX and RX is it possible to solve (in firmware) without board rework

    Refer to S32K148_IO_Signal_Description_Input_Multiplexing.xlsx (Reference manual attachment), it gives a complete list of available multiplex settings for peripheral connection. Swapping CAN RX and TX isn't provided.
  3. FvM

    how to calculate total power for a wide signal?

    Spectrum analyzer gives no true power measurement. But assuming 14 dBm is a suitable estimation for 8 MHz band power, the calculation is correct.
  4. FvM

    Why reactive power is not considered for calculation of efficiency of SMPS?

    Efficiency is always related to AC real power respectively DC power. Power factor is a metric for ratio of real to apparent power.
  5. FvM

    PROBLEM IN DESIGNING HIGH PASS FILTER USING OTA

    Would be helpful to have a description of the original circuit clarifying the role of Va, Vb and Vc and expected transfer function. LTspice circuit has two errors: V4 is shorting X2 output. X2.Vin1 is setting DC bias for filter and must not be grounded but but connected to DC source. You may...
  6. FvM

    TL431 based Relay

    You should know that it's a well defined datasheet property. It's measured for Vref = 0, thus irrelevant for discussed operation mode. On the other side Vka versus Ik is specified for Vk = Vref only. But as long as no other specification exists, I'd expect that Vref versus Ik looks similar...
  7. FvM

    N Channel and P Channel MOSFET symbols

    The Fig. 1 symbols look inpropriate to me. Unlike bulk terminal, there's no junction involved with D and S terminals, they are ohmic contacts to the channel. I didn't notice yet this symbol type in literature.
  8. FvM

    Question on USB Hub

    The term isn't specific to hubs or devices, but in this document obviously applied to hubs.
  9. FvM

    How to design decade up down counter ?

    74LS568 is performing the intended function. You can copy datasheet logic diagram or design the logic by standard design methods, e.g. Karnaugh map.
  10. FvM

    LLC resonant converter

    As a starting point, you may want to show the circuit topology.
  11. FvM

    Problem with motion detector (PIR) Circuit

    Your circuit misses AC coupling (C5 in original schematic) between sensor and first amplifier stage which is essential. 1716792814 Sorry, I confused first with second stage. Schematic is basically correct. 1716793212 I'd add a feature to adjust gain. For debug check node voltages with...
  12. FvM

    TL431 cathode voltage

    Do you see any indications for snap behaviour in the datasheet? I don't. Monotonous I/V behaviour is clearly shown in a diagram. Imin is typically 0.4 mA but can be as high as 1 mA. I presume the I/V curve shape isn't different, just scaled. 1716791940 There are shunt references with...
  13. FvM

    [SOLVED] problems in designing ota based notch filter

    Did you determine OTA common mode range? As far as I see, input source DC offset 0 is outside common mode range. Center frequency seems to be off by factor of 10. 1716710425 Add DC offset of 1.2V to V3. Check X1 and X2 Vout.
  14. FvM

    Efficiency of constant voltage vs current in DC mode from fix ac supply

    It depends. Switching mode power supply has constant high efficiency in both modes, linear power supply efficiency is proportional to output voltage.
  15. FvM

    Help me to find the time constant of this circuit.

    Don't think post #1 circuit is an instructive design, but it works at least in LTspice simulation with NE555 transistor level model. Behavioral NE555 model supplied with LTspice shows incorrect behaviour of discharge pin with switched supply voltage. There might be also a problem of damaging the...

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