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Mar 26, 2019 at 7:59 history edited D.A.S. CC BY-SA 4.0
added 39 characters in body; added 16 characters in body
Mar 25, 2019 at 22:21 comment added user105652 @AltAir Back off some. It was just an observation, not my design. Yes it is a poor design in that the wrong PWM controller is being used in terms of the power source. If R4 keeps burning up, maybe the OP will get a clue.
Mar 25, 2019 at 20:22 vote accept Tirdad Sadri Nejad
Mar 25, 2019 at 20:06 history edited D.A.S. CC BY-SA 4.0
added 155 characters in body
Mar 25, 2019 at 20:03 comment added AltAir @ Sparky256 Increasing the resistance and power of the resistor will increase the loss of heating. The switching circuit loses its meaning.
Mar 25, 2019 at 19:49 comment added user105652 The key is the value and wattage of R4. It should be the flame-proof type.
Mar 25, 2019 at 19:47 history edited user105652 CC BY-SA 4.0
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Mar 25, 2019 at 19:42 history answered D.A.S. CC BY-SA 4.0