Junior Member level 2
my mcu drive the above dimmer in 12Vac
however the gate signal is greatly affect by the triac
and it's lost in control .
The gate and the MT1 signal are so low in impediance (abt 50-100 ohm)
and the MT1 signal feedback on the triac gate termianl. . .
how to solve it?
p.S. if R3 is not added, the 2N3906 will break down
for unknown reason . . .
Added after 8 minutes:
the link is the waveform
the above is measured at triac gate signal !! which completely different from my mcu waveform in below one
the below is from my mcu leg output without tirac
so do any can help me ?
thx a lot