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Type: Posts; User: seyyah

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  1. Closed: Re: No phase delay, no amplitude loss, unity gain voltage follower help required

    The idea is something like the one in the attachment
  2. Closed: No phase delay, no amplitude loss, unity gain voltage follower help required

    I have a intermixed input signal of 100 KHz (Ican reduce it to 50KHz if required) pulsed signal @5V and a very low frequency signal. In mode one, the input signal is high frequency; in mode two, it...
  3. Closed: Current sampling of dc motor for closed loop control.

    I'm tring to control a brushed dc motor which is 24V, 200W in a closed loop manner. I've confused in the inner current loop section. The current is not steady as shown in the attachment. What should...
  4. Closed: CD4051 control voltage levels @ VDD - VSS(=VEE) = 15V

    I've used CD4051 @ 5V VDD and control signals. If I use it @15V, datasheet says VIH should be at least 7V, VIL should be at most 4V. So in order to control the chip should I apply 7V or higher...
  5. Closed: Creating a motion profile and extracting velocity from it.

    I'm designing a closed loop brushed dc motor controller. I want to create a position profile in which motor velocity will be s-curve type for smooth operation. Normally I can do it using jerk,...
  6. Closed: Re: High initial output current prevents smps to start-up and reach to stable conditi

    2.5A start-up current is not a problem, I've tested it for a long period of time and many times.

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    I think that value is not practically applicable...
  7. Closed: Re: High initial output current prevents smps to start-up and reach to stable conditi

    I tried ametek's ntc with 3.5A rating. It worked but it gets real hot @ 1.5A load current.

    - - - Updated - - -

    The waveform is attached. The blue one is current(measured on a 0.1 ohm ressistor...
  8. Closed: Re: High initial output current prevents smps to start-up and reach to stable conditi

    Wouldn't an ntc be better?
  9. Closed: Re: High initial output current prevents smps to start-up and reach to stable conditi

    The load may vary. So some may include inrush current limit some may not. I'm using CV mode. There's also CV/CC mode(which I tried but not inspected in detail and did not help) it may help but I need...
  10. Closed: Re: High initial output current prevents smps to start-up and reach to stable conditi

    Circuit is attached
  11. Closed: High initial output current prevents smps to start-up and reach to stable condition

    I've designed a 24V 2.5A smps using powerint's top266eg chip using their reference designs. It works good normally. But if I connect a high capacity load that draws 5A at start-up but below 0.5A in...
  12. Closed: Re: I could not establish a reliable RS485 communication!

    I've inspected the signals a bit in more detail and saw that there are common mode noise and also differential mode noise especially at 16KHz. I've tried two common mode power type filters which were...
  13. Closed: Re: I could not establish a reliable RS485 communication!

    Hi Klaus,

    I know and I don't want to use bulky solutions, but the signal chokes are genereally tuned to work in the upper MHz range. I don't know how much will they be effective in the kHz range....
  14. Closed: Re: I could not establish a reliable RS485 communication!

    I may use four channels with the configuration of Ground - A - B - Ground. I think it should help. I think the inverters run at a frequency between 5-10KHz which coincides with the communications...
  15. Closed: Re: I could not establish a reliable RS485 communication!

    It is difficult to apply isolation, it requires redesign of everything which takes a lot of time. Why do you think isolation will help? Main problem is the induced noise on the data lines and...
  16. Closed: Re: I could not establish a reliable RS485 communication!

    I definitely agree on the cable with you but there is nothing I can do about it nor can i change the way it is, it is a long story. Anyway, I could only looked at the signals with a scope for a brief...
  17. Closed: I could not establish a reliable RS485 communication!

    I have a master device in a machine room with two 7.5KW inverters and ac motors around. And a slave device 30 meters away from this room. Master and slave are on the same ground and communicates over...
  18. Closed: Re: Serial(rs485 etc) communication, end of message(transmission) determination

    So there is no innovative idea we should stick to these 2 methods basically. I'll be sending binary data. May be parity like method be suitable, adding crc will strenghten the robustness, thanks.
  19. Closed: Serial(rs485 etc) communication, end of message(transmission) determination

    I want to design a simple yet robust serial communication protocol over rs485. There will be multiple slaves and one master. What I could not decided is how to determine the end of a message. I may...
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    [SOLVED]Closed: Re: i CAN'T BELIEVE IT THIS ACTUALLY WORKS !

    Yes but seeing it working gives strength and morale to go on. It also gives a basis to try different things around the working way and makes easier to understand and shortens the path to the target....
  21. Closed: Re: diffrential amplifer output signal not stable.

    http://obrazki.elektroda.pl/8903524400_1365955915_thumb.jpg
    The schematic is attached
  22. Closed: Re: diffrential amplifer output signal not stable.

    I was suspecting of that but i need to introduce high impedance to the source. May be the instrumentation amplifier is the solution here but in this configuration can you suggest something like a...
  23. Closed: diffrential amplifer output signal not stable.

    I am trying to buffer a signal on a capacitor using lt6202 using differential configuration. All resistors are fixed 100kohm in the differential configuration. The signal at the input is a clear...
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    Closed: Re: triac circuit problem

    100nF/630V is not connected to the gate the triac. Anyway i connect one side of the 100nF/630V to the load side instead of triac's main T1 (or relay's COM) terminal. Now that the capacitor is always...
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    Closed: triac circuit problem

    I have a triac circuit as shown in figure. The voltage comes to triac and then goes to a relay's open contact then to the load(a 3A single phase ac motor). I first open relay and then trigger the...
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