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Type: Posts; User: KlausST

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  1. [SOLVED]Closed: Re: Current source for high current LED driver- 24Vdc/max:16A

    Hi,


    I didn´t say you need resistors with true kelvin connections.... but if you want to spend the money ... it may be a further improvement.


    If a power supply is rated for 5A ... this...
  2. [SOLVED]Closed: Re: Current source for high current LED driver- 24Vdc/max:16A

    Hi,

    To the function:
    I see no problem with low side regulation, as long as wiring is correct.
    On the other side you don´t need to feel responsible for all mistakes a user may make.


    I have...
  3. Replies
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    552

    Closed: Re: tda2030 amplifies noise

    Hi,

    The schematic of post#29 has some issues.
    * 200 Ohms may be too low for a standard signal input
    * the pot misses the GND connection
    * the capacitor in combination with the pot forms an LPF....
  4. Closed: Re: Car battery STARTER voltage help (not charger) using variety of methods (possibly

    Hi,

    It seems you don't have an idea about the current drawn at starting an engine.
    This you should do first. Ask at your car garage. Or do an internet search..

    Klaus
  5. Closed: Re: measuring slow oscillations with magnetic methods

    Hi,

    Define your range of frequency.
    "Low frequency" does not mean anything.
    There are natural "low frequencies" with 0.0000224 Hz ... and less ;-)

    Is it accoustic (relative air pressure),...
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    190

    Closed: Re: High Frequency using 8051

    Hi,

    Vague descriptions:
    "Perfect" --> there is no perfect. You need to live with non perfect waveform. How much tolerance in which regard can you accept? Timing, amplitude, ringing, over- or...
  7. Closed: Re: Every few Hours clock running fast rtc1307

    Hi,

    What do you expect from us?
    * If you want us to validate the hardware --> you need to show us
    * If you want us to validate the software --> you need to show us

    Klaus
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    Closed: Re: add new component EAGLE

    Hi,

    either use the menu at the SCHEMATIC or BOARD window: Library -> use ... then select your library
    or use the CONTROL PANEL window: LIBRARIES and select the library

    Klaus
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    99

    Closed: Re: Resistor Burning Issue.

    Hi,

    did you use - or at least calculate whether you need a heatsink?

    Klaus
  10. Replies
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    93

    Closed: Re: Dual Power supply from AC input

    Hi,

    "GND" is just a name ... and it shoud be the signal where (most of) your voltages refer to.
    You may name every signal "GND" .. it´s up to you.

    Example:
    If you name the upper node "GND",...
  11. Closed: Re: Capacitor Burning issue due to unusual reasons

    Hi,

    another confusion:
    The LEDs are connected to "VCC" --> Where is the VCC supply?

    Btw: Even the 2 Layer PCB includes no true GND plane. Your GND is cut in many pieces and long - high...
  12. Replies
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    99

    Closed: Re: Current Regulator and Voltage Regulator

    Hi,

    Voltage regulator: Tries to keep the output voltage constant ... regardless of load resistance, regardless of current
    Current regulator: Tries to keep the output current constant ......
  13. Closed: Re: OV7670 camera interface with Digilent SPARTAN 3E

    Hi,


    I assume you are experienced enough not be afraid to use a new connector.... this is no rocket science.

    Additionally there are several adapter PCBs available.

    Klaus
  14. Closed: Re: OV7670 camera interface with Digilent SPARTAN 3E

    Hi,

    The OV7670 needs more than 60 I/O to connect to the spartan? Are you sure?

    Klaus
  15. Closed: Re: Problems on Sending RS232 Signals through 3 Meter Core Cable

    Hi,


    No urgent need to measure...but measurement gives exact values with your exact conditions...


    If 5A (or 0.5A) goes the one way, it has to come back somehow...this is the return path.
    ...
  16. Replies
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    552

    Closed: Re: tda2030 amplifies noise

    Hi,

    Note:
    In post#5 and post#13 you talk about class A, but the TDA2030 is class AB.

    The "class" (mainly) defines the output stage of the amplifier..and is not related to noise (which mainly...
  17. Closed: Re: Capacitor Burning issue due to unusual reasons

    Hi,

    This is no GND plane, thus you have increased serial impedance at every GND connection.
    This is not reliable and thus not suitable for industrial design. --> use 2 layers PCB with one layer...
  18. Closed: Re: Problems on Sending RS232 Signals through 3 Meter Core Cable

    Hi,

    It's all very confusing ... at least to me...

    You gave just a little snippet of information/schematic of what I asked for in post #3.
    This makes helping difficult/impossible ....
    I...
  19. Closed: Re: Saturation current of coupled inductor used in flyback smps

    Hi,

    Why don't you read the table on your own?
    * row: 220uH
    * column: Isat

    Klaus
  20. Replies
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    Closed: Re: hbridge control from mcu

    Hi,

    There are free simulation software tools. Use them.

    Klaus
  21. Closed: Re: Problems on Sending RS232 Signals through 3 Meter Core Cable

    Hi,

    Show the exact circuit...from master side...which IC, which pin drives which line of which cable...and the complete slave receiver circuit.
    ESD protection including wiring and PCB layout....
  22. Replies
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    249

    Closed: Re: hbridge control from mcu

    Hi,


    If there was a clever, cheaper, simpler ... solution ..... it surely is used by the big H-bridge manufacturers and you may find the circuit in the internet..

    There are many threads from...
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    Closed: Re: Noise in My Audio Amplifier

    Hi,


    No.
    There are several issues.
    And one is, that when you connect all ... then you generate the ground loop.

    Klaus
  24. Replies
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    Closed: Re: Noise in My Audio Amplifier

    Hi,
    here a snippet, there a snippet...this even confuses yourself.
    Do it for yourself: draw a sketch with all your GND connections and you will see the loop.

    Additionally you did not follow the...
  25. Replies
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    Closed: Re: Noise in My Audio Amplifier

    Hi,

    I can't see where you joined both Grounds.
    If you you did not yet connect them, then connect them.

    Else:
    I assume you created a ground loop. Show the complete cabling including power...
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