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Transformers

Discussion in 'General Electronics Discussion' started by Bluepoint SEO, Jul 28, 2016.

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  1. Bluepoint SEO

    Bluepoint SEO

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    Is it true transformers can convert DC to AC?
     
  2. Minder

    Minder

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    Apr 24, 2015
    Not in the general sense,
    Sounds like you are talking SMPS switching power supplies.
    M.
     
    Last edited: Jul 28, 2016
  3. Bluepoint SEO

    Bluepoint SEO

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    A rectifier - is that the four diode circuit?
     
  4. Arouse1973

    Arouse1973 Adam

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    A rectifier converts A.C to D.C, it doesn't have to be four diodes, although that is a common design element.
    Thanks
    Adam
     
    HellasTechn likes this.
  5. Bluepoint SEO

    Bluepoint SEO

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    Thanks guys.
     
  6. HellasTechn

    HellasTechn

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    Correct.

    Also

    4 diodes do full wave rectification with simple 2 wire on secondary coil transformer

    1 diode can do half wave rectification with simple 2 wire on secondary coil transformer

    2 diodes can do full wave rectification with 3 wire (center tap) secondary coil transformer

    In other words like Adam said 4 diodes is a common design but not the only one.
     
    Arouse1973 and davenn like this.
  7. Chemelec

    Chemelec

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    Jul 12, 2016
    And Rectified Without Filter Capacitors is NOT a Good DC Power.
    It will have a Lot of AC Ripple in it.
     
  8. Minder

    Minder

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    Some Early car radios used no rectifiers to convert 12vdc to 200vdc using a transformer, achieved by a synchronous vibrator.
    M.
     
  9. Chemelec

    Chemelec

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    YES, "Pulsed DC" and I still remember Replacing them on numerous car radios.
     
  10. Bluejets

    Bluejets

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    mmmmmmmmmmmmmmmmmm........
    many a late night flat battery in my old Ford Prefect with an AWA Diamond Dot as a result too.
     
  11. Bluepoint SEO

    Bluepoint SEO

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    Okay the reason I ask (and I'm miles away from doing it) is because I believe when you're making a radio transmitter and you want to modulate your voice into frequencies you need to convert the input from the mic into AC signals. I'm not sure this is 100% correct but I think I'm on the right path? I'd love to see a basic schematic of a rectifier circuit if someone would like to share? I know I could Google it but it would take away the point of asking you experts for advice! :)
     
  12. davenn

    davenn Moderator

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    the mic signal is already an AC signal

    you don't need a rectifier in a modulator for a transmitter


    Dave
     
  13. davenn

    davenn Moderator

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    have you read about how an AM or a FM transmitter works and how they are modulated ?
     
  14. Bluepoint SEO

    Bluepoint SEO

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    Hi Davenn I have studied AM but not FM, I think I must have thought the mic was DC and transformer converted it up because of a video I watching on YouTube but I'm going to now second guess the transformer was to amplify the AC current from the mic perhaps?
     
  15. Bluepoint SEO

    Bluepoint SEO

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    Sorry not amplify the current but the voltage?
     
  16. HellasTechn

    HellasTechn

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    it probably was a dynamic mic with an impedance transformer.
     
  17. Chemelec

    Chemelec

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    Bluepoint SEQ...........What are you trying to make?

    A transmitter?
    To transmit How Far?
    AM, FM, Short Wave?

    Want to discuss this by phone?
    The UK is a free call for me.
     
  18. Bluepoint SEO

    Bluepoint SEO

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    Only within 1m of a radio. It's a long term goal if I'm honest and I have to look into the laws here in the UK before I build such a device. I'm interested in AM for now.
     
  19. Chemelec

    Chemelec

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    Jul 12, 2016
    1m?
    1 Meter or 1 Mile?
     
  20. Bluepoint SEO

    Bluepoint SEO

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    Jul 28, 2016
    100cm would be sufficient :)
     
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