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  1. R

    Led display digital Voltmeter

    problem was solved... thanks
  2. R

    Led display digital Voltmeter

    http://www.electronics-lab.com/projects/test/014/index.html i made  a circuit like this and it works but how can i make the reading more stable because currently the reading is keep on fluctuating. thanks
  3. R

    Input Filter circuit design needed

    i need it for AC line.. if possible, can include the value of the components for me ? thanks
  4. R

    Input Filter circuit design needed

    Hi, sorry to asking a noob question, anyone have any idea or any circuit design for a input filter for a 240VAC? Thanks a lot
  5. R

    Low-pass Filter?

    audioguru thanks a lot, I'll try again
  6. R

    Low-pass Filter?

    is it add a resistor at the VDD pin 14 of CD4047? zener diode is placed parallel with the resistor ?
  7. R

    Low-pass Filter?

    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?
  8. R

    Low-pass Filter?

    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...
  9. R

    Low-pass Filter?

    audioguru, do you have any pure sine wave 12V to 240V inverter ? Thanks
  10. R

    Low-pass Filter?

    for backup computer for a short while only.. btw, the secondary transformer output is 240V, 240V x 2A = 480VA right? why time the 2A with the primary voltage; 12v ?
  11. R

    Low-pass Filter?

    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?
  12. R

    Low-pass Filter?

    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?
  13. R

    Low-pass Filter?

    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... Thanks
  14. R

    Low-pass Filter?

    sorry for confusing, I built this 500W inverter but not yet connect the transformer to that circuit yet. and the 24VAC is come from the circuit which should be connected to the transformer. sorry for drawing it wrongly.
  15. R

    Low-pass Filter?

    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?
  16. R

    Low-pass Filter?

    Can i use the 1N5401 for the diode ? the voltage at the primary side of the transformer should be 12V AC right ?
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