![]() ![]() ![]() When driven individually, they work fine, its only when in a parallel setup I am seeing the problems. The IC's are heatsinked and have a fan on them - so this shouldnt be the case? Maybe this is due to some sort of inbalance between the 2 IC's? They are both set with a gain of 2 - 0.1% resistors, and have an output series resistor with a value of 0.1Ohms. dual 20V single 15V, power amplifier PASS LM4766 1969 applicable. I think this is due to the IC's getting too hot? The LM3886 is one of the most highly regarded audio chip amplifiers in the DIY community. dual 15V 150W pure copper toroidal transformer LM3886 / TDA7293 / 7294 and other. As soon as I dropped the resistance to 12Ohms, the output of the amplifier became unstable. When testing on a test load, set at 100 ohms, the parallel setup worked fine. I was previously using the LM4766 in a bridged setup, but this was for a radio drawing 1A at 12V - which worked perfectly.ĭue to the increased power I looked at using the LM3886 in parallel as this looked like it could provide enough power easily. I suggest having a look at my Taming the LM3886 article series, in particular the grounding section. I am using it to drive the DC supply of a Radio - which draws approx 6A at 12V, so essentially a 2ohm load. Thank you for noticing my LM3886 P2P vs PCB grounding thread. I am currently using the LM3886 in a parallel setup as explained in app note. ![]()
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