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Posts posted by ray99mond

  1. i got a problem here,
    i constructed such circuit and i am able to get a square wave output (without connecting to transformer yet), however once i connected to the transformer, the IC CD4047 burned.
    may i know what is the problem? or i really need to add a fuse there?

  2. Hi audioguru,

    1. how come the -TRG (pin6) of the CD4047 is not ground like +TRG (pin8)?
    2. The output of the Q (pin10) & -Q (pin11) is a square wave right, then what is the function of LM358? square wave generator?
    3. what is the function of 2SC1061 and 2N3055?
    4. why connect 12VDC to the pin2 of the center tap transformer?


  3. actually the transformer that i am using now is a 240V to 12V  step down transformer for my rectifier circuit.

    I need this inverter for my UPS project, so this 500W inverter is suitable...
    so what kind of transformer i should get to support 500W output? 20A transformer?

  4. I see... thanks for your explanation .. ;D

    btw I have a 3A step down transformer from 240VAC (primary) to 12v-0-12v (secondary) for the rectifier system, can i use it as the step up transformer for this circuit? 12v-0-12v become the primary side while the 240VAC as the secondary side?

  5. the voltage will change with the load?
    the project is using 12v-0-12v to 220 transformer, so the circuit circuit should generate 12VAC at the primary side of the transformer right ?

    My problem is why i get 24VAC instead of 12VAC...

  6. Thanks for your great reply

    I measured the voltage between "12V to 0" and i get 24VAC
    and same result for the "0 to 12V"

    I didn't connect to a transformer yet for safety purpose....

    so is the reading correct ? or should be 12VAC instead of 24VAC?
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