Recent content by m_alizd

  1. m_alizd

    AC Polarity swapping circuit

    In my opinion that should be a priority for everyone, thanks for bringing that up. Thanks for encouraging me to have fun, I think that's what I need it. I don't think it is, if not anything, now I know vacuum balloons for heavy lifting was considered as well as perpetual motion.
  2. m_alizd

    AC Polarity swapping circuit

    Harald, your interpretation is exactly right. The load will have rectifier so DC component on AC line shouldn't be a problem. Thanks for the links although they look too sophisticated for me. I'd be checking H-Bridge in first step. I still can't understand how you think I should use SCRs in...
  3. m_alizd

    AC Polarity swapping circuit

    I'm not good with descriptions I might try , Achieving the attached output from the input is what I want to achieve. Is there any questions in the circuit input/output?
  4. m_alizd

    AC Polarity swapping circuit

    Well no wonder! True, that's why I have that challenge and all these discussions. And remember this is all a hypothesis right now, may work or may not. maybe too expensive that not worth it. But in my opinion any idea worth a thought and maybe try it if it doesn't cost a fortune
  5. m_alizd

    AC Polarity swapping circuit

    Maybe that's the gap which causes misunderstanding, and also perhaps it's needed to go through all the posts. I didn't mean to deliver power to buzzer directly. This would just be a trigger for a circuit that would control the buzzer, as to when to start buzzing and when to stop. Right?
  6. m_alizd

    AC Polarity swapping circuit

    Really??? What's the problem with it?
  7. m_alizd

    AC Polarity swapping circuit

    I missed your questions as I was focused on exploring solutions. AC as it is powers up the load, but I'm hoping to get more out of it. With the output as described I'm hoping to trigger an action in load apart from it's normal operation. Let's say there is a buzzer in the load and I want to...
  8. m_alizd

    AC Polarity swapping circuit

    Yes that whole board for A$12.5 is a real bargain. If you check the component part itself, you'd be surprised it's as same price as that board: https://au.element14.com/texas-instruments/lm3886t-nopb/ic-amp-audio-power-mono/dp/3116867?st=LM3886 Eventually I would need to buy two of each on every...
  9. m_alizd

    AC Polarity swapping circuit

    I spend a bit of time on this as you and Whonoes both mentioned. Just considering a typical H-Bridge with 4 SCRs and the load. That seems to be acting like rectifier and I couldn't get positive and negative cycles. From my research it turns out I should have 8 SCRs and 4 different control...
  10. m_alizd

    AC Polarity swapping circuit

    Thanks Whonoes, as much as I like the idea, if my calculations are right, this solution seems to be much more expensive than an SCR H-Bridge which is what I'm going to figure out how to do. As you said either an oscillator or a dedicated MCU/firmware needed to generate the waveform. The other...
  11. m_alizd

    AC Polarity swapping circuit

    Yes we can say that
  12. m_alizd

    AC Polarity swapping circuit

    I'm not familiar with power amplifier, any particular part you can name for me to check out? How do they compare with SCRs pricewise? Do they need some other circuits on the side like oscillators, etc to generate sinewave?
  13. m_alizd

    AC Polarity swapping circuit

    Just normal two core cable carrying 12Vac.I will use Zero crossing detection to trigger another circuit that detects if positive or negative half of the cycle is happening, i.e. normal polarity or swapped polarity is coming. But for now I'm focused on the power supply end and not worried about...
  14. m_alizd

    AC Polarity swapping circuit

    What control signal and waveforms can do that? Sorry for confusion, the load would be away from the power supply only connected via an AC lead. And before the rectifier in the load there can be zero crossing detect to sense this.
  15. m_alizd

    AC Polarity swapping circuit

    In fact someone did a simulation in LTspice to that generates the output power waveform that is required. Swapping polarity is modeled by multiplying sinewave by -1 when needed. I attached the simulation just in case. The aim now is to come up with a circuit that generates same output as Vcd...
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