Re: My Behrenger UB802 mixer won't power on
Should be funI just picked up a UB802 for a great bargain - no AC adaptor. Luckily I'm versed enough to make it work. The unit powers up and works just fine with the same 18.5V rail on both inputs. However just as an exercise I'm intending to build an SG2525 based forward boost converter to go from 12V -> 2x 18.5V, just as an exercise in learning.
Is that 130V RMS on the MOV? Ceramic caps won't do much for transients... anything substantial will run the risk of blowing them... also, MOVs deteriorate with each time they fire...I did put an MOV (130V) on the input AC lines, and bypassed both lines to ground with small value ceramic caps to shunt transients. That's all that's really necessary, the mixer makes the bipolar DC and filters it.