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Type: Posts; User: FvM

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    Closed: Re: Strain gauge touch probe for CNC digitizer

    I presume the output of the shown sensor arrangement can be transformed to cartesian xyz coordinates by a linear operation. A signal that represents force in any direction requires however nonlinear...
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    Closed: Re: frequency divider phase

    That's a rather trivial interpretation, only based on the external waveforms shown in the simulation. You need to look at internal voltages and analyze how the reset operates. With respective...
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    Closed: Re: USB differential pair on 2 layer board

    I have no impedance calculator at hand right now, but 40 miles trace width doesn't sound far off. It depends on the minimal clearance that can be implemented in the applied technology.

    What's the...
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    Closed: Re: PLC software for network access

    Most PLC systems have either built-in or optional network interfaces and provide different protocols as server or client.

    What is your PLC system, what want you exactly to achieve?
  5. Closed: Re: MCPCB which is double sided and with plated through vias

    I see that the LEDs are populating only a small part of the top side, thus a heat spreading feature may be helpful. The through plated double side MCPCB is probably providing more thermal...
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    Closed: Re: Driving Induction motor using TRIAC

    I have used 1/4 W metal film resistors (0207 axial package) and 1/2 W in more rugged designs.


    Not absolutely necessary.
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    Closed: Re: The xtal spice model

    Crystal models have been posted along with oscillator circuits in the Yahoo Ltspice forum https://groups.yahoo.com/neo/groups/LTspice/info mostly by Helmut Sennewald.
  8. Closed: Re: Brief List of 8 bit pic micro's and their features

    I'm using the parametric search https://www.microchip.com/ParamChartSearch/Chart.aspx?branchID=30048
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    Closed: Re: frequency divider phase

    The stimulation signal timing is the same, but the required reset setup time is obviously different.
  10. Closed: Re: MCPCB which is double sided and with plated through vias

    Thanks for clarification. I didn't yet see this kind of double sided MCPCB. So they manage to isolate the vias from the metal core somehow.

    Two points are unclear though:
    - What's your design...
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    Closed: Re: frequency divider phase

    Both simulations are different regarding DFF propagation delay and reset input setup time.

    We don't know which parameters you put in.
  12. Closed: Re: MCPCB which is double sided and with plated through vias

    What should be the purpose of metal cladding with your board? How can it connect to a heatsink? Multilayer MCPCB can be made, although not so common. But vias go never through the metal base plate.
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    Closed: Re: Motion Detector Alarm Timer Modification

    It's obviously a burglar alarm device, indicated by the tamper switch. 15 min delay sounds very unusual for burglar alarm, are you using it for a different application?
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    Closed: Re: Driving Induction motor using TRIAC

    The R value is reasonable 2.2nF. Y2 capacitor won't give much snubber effect, better use X capacitor with 47 nF or 100 nF capacitance.

    - - - Updated - - -

    A circuit that I used in many designs...
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    Closed: Re: Driving Induction motor using TRIAC

    No clear values specified for R31 and C10.
  16. Closed: Re: Spartan 6 - OSERDES2 to ODDR - Unroutable signals

    The DDR output register is fed with half the final output data rate. This should allow to use general core registers for the 5:1 serializers. In other words make your own 10:1 OSERDES block.

    If...
  17. Closed: Re: Output inverter bridge for welding TIG machine?

    That's an option. It's still rather difficult to interface the SMD transistor package to a heatsink. You can e.g. use massive thermal vias and mount the PCB on top of the heatsink.

    Besides special...
  18. Closed: Re: Output inverter bridge for welding TIG machine?

    You should start to design the transistor heat sinking. 150 A (27 W conduction losses in static operation) won't work on any kind of regular PCB. I guess, you better switch to conventional transistor...
  19. Closed: Re: "Crystal set" radio works only when connected to earth

    The confusing point is the claim of using a ferrite rod antenna. If it works, radio operation won't depend on an earth connection.

    I guess, calculation will clarify, that the power received by the...
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    Closed: Re: PNP transistor not working

    It's apparently voltage supervisory application. You would specify threshold voltages for all monitored voltages, e.g. +5V >= 4.75V, -5V <= -4.75 and use appropriate circuitry.
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    Closed: Re: Driving Induction motor using TRIAC

    Which circuit? The latest circuit in post #6 has triac MT1 and MT2 interchanged, not correct. The snubber circuit, MOV parallel to RC series circuit across triac main terminals is however useful....
  22. Closed: Re: How create negative voltage -700mV - -1000mV 30mA?

    Regulated SC voltage inverters are available with -1.2V Vref, e.g. lm27761. You may introduce an intentional offset to the feedback path to get lower output voltage.

    Another option, an unregulated...
  23. Closed: Re: Turn on power triac - proposed circuit analysis

    R4 is effectively useless because industry standard triacs have a gate "pull-down" resistor already built in.

    RC filter R5 + CAP is suggested at least for inductive loads to prevent opto triac...
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    Closed: Re: computing rated current for inductors

    First point has been clarified, the Sumida datasheets give sufficient information about current rating.

    Second point is how to read it. Assuming ΔT of 30 or 40 K for Idc temperature rise is just...
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    Closed: Re: OP amp output oscillating

    The 4 MHz "noise" can't be generated by a slow OP, it must be sourced from the µC or other circuit parts. Seeing so large interference signals raises doubts about proper circuit layout, particularly...
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