Service Notification

EDAboard.com Scheduled Maintenance for 6/4/2020

Starting at 12:00pm EST Thursday June 4th EDABoard will be in maintenance mode and be unavailable. The website is being migrated to a new web server and the software is being upgraded. With the large volume of data & images to move, migration is expected to last for 8 - 10 hours. When started the forum will go into maintenance mode and no posts, edits or registrations can be made.

Search:

Type: Posts; User: KlausST

Page 1 of 20 1 2 3 4

Search: Search took 0.12 seconds.

  1. Closed: Re: voltage gain and I/O resistance for ideal amplifier

    Hi,

    Thatīs why we have OPAMPs
    use a feedbacked OPAMP. It comes pretty close to an ideal amplifier. For sure it has itīs limits.

    But first you need to decide your requirements. The...
  2. Replies
    8
    Views
    375

    Closed: Re: RC HPF filter noise?

    Hi,

    an electrolytics capacitor is made for DC voltage across it. It has a "+" terminal and a "-" terminal. Never connect the the other way round.

    So if you usit it as 48V blocking capacitor...
  3. Closed: Re: Infra Red Proximity sensor and Sunlight Problem

    Hi,

    the resistor must not be defined by the "gain" for sensing the object but it must be defined by the max intensity of light ... which obviously is the sunlight.

    If the signal then is too low...
  4. Closed: Re: voltage gain and I/O resistance for ideal amplifier

    Hi,

    your first question is about an "ideal amplifier"
    your other question is about a simple bjt amplifier .. which surely is far from an "ideal amplifier".

    Itīs hard to compare both. They...
  5. Closed: Re: Simple 8 bit uP, 4 A/D in, 4 digital i/o, 8 bit A/D or better, C tools

    Hi,


    Indeed only the first ones are ARMs ... further below there are many others.

    Yes, itīs just a general Microchip selection guide...

    Klaus
  6. Closed: Re: Infra Red Proximity sensor and Sunlight Problem

    Hi,

    for sure the voltage at the resistor is non linear with the given circuit ...
    you need to calculate currents, dimensionate the parts (resistors) ... and maybe you see you need an...
  7. Replies
    8
    Views
    261

    [SOLVED]Closed: Re: Driving 24v Vacuum Pump - DC Motor

    Hi,


    No. The diode is not to reduce voltage. It is to protect the MOSFET from high voltage spikes caused by the inductivity of the motor (O.K. it does reduce voltage (spikes) in this case)
    ...
  8. Replies
    5
    Views
    250

    Closed: Re: Switching LM317 on/off

    Hi,

    Iīve read "mosfet before the LM317" and "mosfet which can take 30v @ 600mA"
    thus I assumed it was 20 x 30mA = 600mA. This was wrong as I see now.

    ***
    140 LED circuit.
    Still unclear how...
  9. Closed: Re: Simple 8 bit uP, 4 A/D in, 4 digital i/o, 8 bit A/D or better, C tools

    Hi,

    I did an internet search "PIC parametric search" and the first hit leads to this page:

    https://www.microchip.com/paramchartsearch/chart.aspx?branchID=1005

    Klaus
  10. Replies
    6
    Views
    316

    Closed: Re: Interfacing GSM Sim900a with PIC16f887

    Hi,

    * baud rate mismatch
    * wrong interface setup (8N1)
    * wrong voltage levels
    * wrong wiring

    Klaus
  11. Replies
    5
    Views
    250

    Closed: Re: Switching LM317 on/off

    Hi,

    it seems you did not do an internet search.

    * selecting a MOSFET: just go to the distributor of your choice and input your values. Or any Mosfet manufacturer..
    * If you want multi chanel...
  12. Replies
    8
    Views
    261

    [SOLVED]Closed: Re: Driving 24v Vacuum Pump - DC Motor

    Hi,

    you say "not need an H Bridge or complex drivers"
    but then use a switch mode regulator. Isnīt this complex, too?

    If you donīt want to waste the (30V-24V) * 0.5A = 3W then the next simple...
  13. Closed: Re: Infra Red Proximity sensor and Sunlight Problem

    Hi,

    I'd expect the AC signal not to be influenced by the DC (sunlight) signal.

    Maybe your circuit is not suitable.

    Klaus
  14. Closed: Re: Input rise time of start/stop pulse to the TDC

    Hi,

    I don't understand your question .... because we don't know which IC you use nor do we know your application requirements.

    General answer:
    If I wanted to know this, I'd read it's...
  15. Closed: Re: Full Bridge DC-DC Converter Operating Frequency

    Hi,


    Why do you wonder?
    From post#5:


    From post#4:
  16. Closed: Re: Measurements of SNR and SFDR of ADC for different input frequencies

    Hi,

    SNR means signal to noise.

    Which value does change? "Signal" or "Noise"?

    ****
    For a more detailed answer we need more detailed informations first:
    How do you measure and calculate...
  17. Replies
    8
    Views
    375

    Closed: Re: RC HPF filter noise?

    Hi,


    No electrolytics, please.

    Best is a film/foil capacitor for audio.


    Klaus
  18. Closed: Re: Which microcontroller to use to control a BLDC motor?

    Hi,


    Semiconductor manufacturers provide such informations.
    I thought I mentioned this before...

    Klaus
  19. Closed: Re: Full Bridge DC-DC Converter Operating Frequency

    Hi,

    again, again, we can not know what signals you have.. so it makes answering difficult, uncertain and full of doubts for us and for you.

    In case you have a low duty cycle at the rectifier...
  20. Closed: Re: voltage gain and I/O resistance for ideal amplifier

    Hi,

    Generally: R_out is not the same as R_load! Thus don't calculate with "V_out/R_out" at all.
    In some cases it's possible to use V_out/V_load = I_out = I_load.

    If you want to build a voltage...
  21. Closed: Re: Full Bridge DC-DC Converter Operating Frequency

    Hi,

    depending on your (not yet shown) driving scheme of the bridge you get different waveforms at the transformer.

    But the transformer does not care if there is a rectifier at it's output or...
  22. Closed: Re: Which microcontroller to use to control a BLDC motor?

    Hi,


    I already wote this..

    Did you do the microcontroller search?
    Did you do the application note / design example search?
    From your schematic ... it seems you didn't go through the design...
  23. Closed: Re: switching of board rate in PIC microcontrollers

    Hi,

    What you mean is "baud rate".

    The CD4016 will not cause any baud rate problem. But your software needs to handle the different baud rates.

    You should switch the CD4016 only when the all...
  24. Closed: Re: Which microcontroller to use to control a BLDC motor?

    Hi,

    To get a suitable answer you need to give all informations first.
    Like:
    * your control hardware (scheme)
    * your control loop algorithm
    * your inputs for the control loop

    With the...
  25. Closed: Re: Full Bridge DC-DC Converter Operating Frequency

    Hi,

    As with your previous post: draw a sketch including the signal/frequency informations.

    We don't know where you input/expect which frequency.
    Where do you "rectify"?

    Klaus
Results 1 to 25 of 500
Page 1 of 20 1 2 3 4