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Recent content by anotherbrick

  1. A

    1 mosfet square wave driver doubles 24 V at output

    with the diode, the clutch current increase from near zero PWM on and grasp earlier than without diode without diode, current increase from %50 PWM on thank you for your help
  2. A

    1 mosfet square wave driver doubles 24 V at output

    dear all, with your advice I put a fast power diode across clutch coil and I got the correct square wave PWM output, now I have another problem I want to tension control a reel while it unwinds the sheet paper material I want to use PID control with STM32 uC error = Reference - Actual (...
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    1 mosfet square wave driver doubles 24 V at output

    dear forum members I am driving an magnetic clutch with 1 mosfet between 0- 100 % duty however the output signal is weird it sinks below ground and outputs AC what am I doing wrong with such simple circuit, thank you
  4. A

    2 loadcell 1 amplifier

    dear forum, is this circuit correct for addition of 2x loadcells signals ? thank you
  5. A

    band pass filter for inverter output current and voltage signals

    hi , I read the messages in the web page link you gave above however I couldnot find a circuit schematic or paper in google or in "art of electronics book" about how to get real and reactive components of current signal can you give web page adress if possible thank you
  6. A

    band pass filter for inverter output current and voltage signals

    hi Klaus, I have 3 questions can there be frequency components with lower freq than the inverter switching freq at the current and voltage signals second what is a controlled rectifier - do you mean thyristor ? for inverter body instead of IGBTs ? third what do you mean built with analog...
  7. A

    band pass filter for inverter output current and voltage signals

    hello dear forum, I try to design an 20 KHz 1 KW inverter for ultrasonic welding In order to run the inverter at resonance I pick output current and voltage signals and feed them to comparators The comparator detects zero crossing of both signals and according to them the STM32 uC increase or...
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    AD9833 doesnot obey my code

    Thank you all for your advices it worked with HW SPI ( why it didnot work with SW SPI - it took my 3 weeks - the examples I found in the internet misleaded me ) I reset it here - from my original post ( writeSPI functions )
  9. A

    AD9833 doesnot obey my code

    hello 1) I init AD9833 at the beginning of main 2) this time I init both freq and phase regs - pls look at below code 3) I add logic analyser output - it shows capture inside while (1) in main function ) in the document of AD9833 it says even how to connect 8051 please look at the picture...
  10. A

    AD9833 doesnot obey my code

    hello , thank you the only difference between my code and figure 26 is that figure 26 init both freq and phase registers I writeSPI(0x2028); before and after freq change which select 28 bit write and select freq0 phase0 reg. for output ( I am not using freq1 and phase1 regs ) and the...
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    AD9833 doesnot obey my code

    hello dear forum I am trying to generate 20 Khz square wave with AD9833 however AD9833 only generate square wave with correct freq. at the init command if I want to change the frequency afterwards inside while loop, for example sweep around 20 Khz it changes the output to sinus wave with a...
  12. A

    How do I kickstart ZCS half bridge inverter

    hello freebird , does UVLO mean under voltage lock out ? or something else can you open your answer a little bit sorry I didnot understand you - can you help a little with a schematic?it is important for me your answer thank you
  13. A

    How do I kickstart ZCS half bridge inverter

    if the problem is phase delay then does this mean that it is impossible to make ZCS mode inverter ? because there will be always a non zero phase delay between the actual zero cross of current and the firing of MOSs because of the delay in the electronics am I wrong or is there another...
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    How do I kickstart ZCS half bridge inverter

    here the schematic
  15. A

    How do I kickstart ZCS half bridge inverter

    hello dear forum members finally I gave kickstart to inverter with following circuit everything fine , inverter started this is the US horn which the inverter is driving everything fine , inverter started however the horn is 20 Khz nominal as you can see amplified CT is showing a...
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