24VAC dimmer

Discussion in 'General Electronics Chat' started by flyingace0072001, Mar 28, 2014.

  1. flyingace0072001

    Thread Starter New Member

    Mar 28, 2014
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    Any ideas how to best control an output load requirement to 13VAC at 300mA when the input varies from 16VAC to 30VAC depending on the connected transformer winding ratio and location in the country? I want to to come up with a circuit that does not require a PWM signal, just basic components like an SCR, triac, zener diodes, etc.
     
  2. inwo

    Well-Known Member

    Nov 7, 2013
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    Do you have details on the application?

    Seems rare to need regulated AC as the end product.
     
  3. flyingace0072001

    Thread Starter New Member

    Mar 28, 2014
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    0
    The product needs around 13vac at 300mA to operate properly and it could be installed on nominal 24vac systems throughout the country that could have voltage variants from 16vac to 30vac. Regardless of the input ac it needs to provide 13vac out.
     
  4. Bernard

    AAC Fanatic!

    Aug 7, 2008
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    Should be able to use a 120V AC, 1A, " Variac" on a 24V AC system if frequency is around 50 Hz- 60 Hz.
     
  5. ScottWang

    Moderator

    Aug 23, 2012
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    What's the load for the AC power?
     
  6. THE_RB

    AAC Fanatic!

    Feb 11, 2008
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    Why does the product require AC 13v 300mA?

    It is most likely the very first thing inside the product itself will be a bridge rectifier and filter cap, to make that 13v AC into DC.

    If you provide full information instead of just part of the information people can help you much better.

    So we need to know, WHAT is the product?
    :)
     
    inwo likes this.
  7. inwo

    Well-Known Member

    Nov 7, 2013
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    Any standard inverter design should work.
    Regulating the input voltage should be easy enough at your low current levels.

    Use appropriate transformer secondary. ie 13vac
     
  8. Bernard

    AAC Fanatic!

    Aug 7, 2008
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    Variable AC output transformer, CAT# SC-3M, All Electronics, 110V in,[ 60 HZ] 0-130V out @ 3A, US $ 64. Only problem reported-meter accuracy. Might find one cheaper but not at Mouser or Digi-key.
     
  9. #12

    Expert

    Nov 30, 2010
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    Apparently the problem is to input anything from 16 VAC to 30 VAC and correct it to 13 VAC. A Variac won't do that all by itself. It will need some feedback circuitry.

    Still, the question is vague enough that nobody wants to try designing a circuit with so many variables.
     
  10. Bernard

    AAC Fanatic!

    Aug 7, 2008
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    Feedback present; knob- hand- meter-eyeball. Might be different Vs are just at differens sites, not variations at a individual site??

    Lots on ebay, $ 8.99 to $1,ooo's, first choice, Gen. Radio, W5MT3, around $ 40.
     
    Last edited: Mar 29, 2014
  11. THE_RB

    AAC Fanatic!

    Feb 11, 2008
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    It's probably just some standard DC device that just happens to have a label spec of "13v AC".

    But the OP seems to have skipped out on us?
     
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