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Type: Posts; User: FvM

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  1. Replies
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    Closed: Re: higher output frequency with PCA9685?

    The maximum PWM frequency is actually fclk/(4*4096), there's an additional prescaler.
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    Closed: Re: Pulse power dissipation in a BJT

    I see that medium power transistors like FMMT495, MMBT5550 or BCX41 have apparently sufficient thermal capacity to handle the requested pulse load, under the prerequisite that the average power can...
  3. Closed: Re: Sampling Bandwidth vs. Bandwidth in Tracking Mode of a Sample/Track and Hold

    I doubt that both terms have clearly commonly understood definitions. The original post is apparently referring to a paper or datasheet. If so, why don't you quote the definition therin.

    It's more...
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    Closed: Re: Pulse power dissipation in a BJT

    10 ms is much too long for the small thermal capacitance of low power SOT23 transistor, e.g. BC847. A medium power transistor in SOT23 with larger chip might work.
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    Closed: Re: Differential pair with dynamic resistance

    T2 is not saturated with Rc=2k, only with 20k.
  6. Closed: Re: Waht is the name of ATX connector on motherboard?

    Molex Mini-Fit Jr series
  7. Closed: Re: How to trace the original of netlist gates back to the original RTL description

    Did you try to synthesize with different optimizer goals and timing constraints? A possible reason for increased power consumption could be that the synthesizer is duplicating gates to achieve timing...
  8. Closed: Re: Please help me avoid a disaster with my first pcb

    Processed copper thickness is the relevant parameter for trace resistance and current rating. Outer layer copper is build by electrolytic deposition on the etched base copper structure when through...
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    Closed: Re: Transformer winding, how to?

    If I understand right, you are trying to build a saturable reactor. The type shown in the first link can't be build on a single core. Sending current back forth through the bifilar winding has just...
  10. Closed: Re: Please help me avoid a disaster with my first pcb

    VCCIO is the 5V output of DCDC, I think it's o.k. to route it this way.
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    Closed: Re: USB protocol related queries

    I would immediately move the thread to ASIC section - if it had any ASIC related questions. But yet there are none. Please review your questions.
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    Closed: Re: USB protocol related queries

    I don't see a relation of your previous questions to ASIC design, it's neither mentioned nor obvious in any regard. The discussed problems, although a bit vague, are general USB topics. The...
  13. Closed: Re: Please help me avoid a disaster with my first pcb

    Not completely clear which net is addressed.

    Regarding the double side population, I understand that it can be only realized with hand soldering. The components placed on top of through hole pins...
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    Closed: Re: USB protocol related queries

    A mass storage device is operated with read and write to logical blocks, the file management is performed by the controlling computer. Interrupting a transaction in the middle involves a high risk of...
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    Closed: Re: Solving issues in my PCB grounding

    The SMPS is a Class I device, designed to be operated with proper proctective earth connection. The problem description suggests that the PE connection is missing.
  16. Closed: Re: Generating a digital pulse of 10 secs and 1 sec

    How about building a digital timer? Can be made in programmable logic, but also using a microcontroller or by assembling discrete logic ICs. All three variants will use a crystal oscillator if...
  17. Closed: Re: Def-Stan 59-411 proble with MOVs don't dissipate energy

    I wonder if the used MOV are actually rated for the applied DCS12 test signals, which are considerably different from industry standard surge test signals.

    But if the MOV survives, the problem is...
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    [SOLVED]Closed: Re: Op amp integrator formula

    No idea where you got the integral expression. I guess " ∫ t 0" is a garbled form of "integral from 0 to t", which would be the correct description of inverting integrator in time domain in contrast...
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    Closed: Re: water flow detection in a pipe

    Consider flow and pressure as independent parameters. Pressure is important for "invasive" sensors.

    0,015 m/s seems correct and is quite low. An arbitrarily selected 6" industry standard paddle...
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    Closed: Re: UC3845 ETD29 transformer PWM signal

    The ringing occurs in discontinuous mode when the rectifier current flow stops. It's a high impedance/low energy oscillation (frequency set by main inductance and sum of winding, transistor and...
  21. Closed: Re: Off-the shelf transformer for push pull converter

    Or referring to ∫Vdt (ET in your terminologie)
    I = ∫Vdt/L
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    Closed: Re: Experienced CADSTAR user's

    You should take a look at Pulsonix. The Software has been developed by former Racal Redac (the origin of Cadstar) guys. The look and feel is still Cadstar like.
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    Closed: Re: Solving issues in my PCB grounding

    I guess there's no high voltage generated on the board. Hence it's a problem of the power supply. What is it?
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    Closed: Re: USB device( related to DMA and sram) and USB protocol

    Non of the question can be answered without referring to the specific USB device type und functionality. Which device are asking about?
  25. Closed: Re: Is a snubber circuit required with zero-cross optocoupler

    I experienced a case where a MOC3040 plus triac combination was periodically self triggered even with pure resistive load by power supply dV/dt. A 220 ohm/47 nF snubber and filter was added to the...
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