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I am using AC dimmer circuit using arduino. circuit is working normally but the only problem is about voltage. as the dimmer circuit varies dimming,the output voltage also increases and decrease. Line voltage is 240 volt and output voltage goes till 328 volt. Is this normal working of triac BT139 or I am doing something wrong?

the circuit is which I am using for dimmer on arduino

the dimmer circuit

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  • \$\begingroup\$ AC voltage is measured by RMS (a type of average) the peak voltage is higher. \$\endgroup\$ – Jasen Feb 19 '18 at 7:08
  • \$\begingroup\$ Welcome to EE.SE. Those Instructables articles are usually very long so not many of us will bother to read your link. Add the image into your post instead. (You can paste the URL into the image upload dialog.) \$\endgroup\$ – Transistor Feb 19 '18 at 7:10
  • \$\begingroup\$ You are right sir, but triac should work as I am getting output at load? \$\endgroup\$ – Chaitanya Paraye Feb 19 '18 at 7:13
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    \$\begingroup\$ How and where are you measuring the voltage? i.e., Multimeter (make and model) and range or oscilloscope? \$\endgroup\$ – Transistor Feb 19 '18 at 8:10
  • \$\begingroup\$ Using multimeter \$\endgroup\$ – Chaitanya Paraye Feb 19 '18 at 10:24
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Line voltage is 240 volt and output voltage goes till 328 volt. Is this normal working of triac BT139 or I am doing something wrong?

enter image description here

If the RMS voltage is (say) 1 volt then the peak voltage will be 1.4142 volts. If the RMS voltage is 230 volts then the peak voltage will be 1.4142 x 230 volts = 325 volts and the peak-to-peak voltage will be 650 volts.

Picture from here

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  • \$\begingroup\$ Got it, thank you sir to clear my doubts, I was scared when got high voltage at output. \$\endgroup\$ – Chaitanya Paraye Feb 19 '18 at 10:41

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