i'm just finish to instaled 2.1 soundsystem in my mom's kitchen.
its dual lm3886 + ETI 150watt ( 4 transistor ) powered by single square 10A transformator 220v/24V - 0 - 24V, 25A diode bridge and 2 x 12.000uf/50V and 2 x 8200uf/50v in paralel, and a pair of 100nf wima MKP/100v at the end.
i built this all to replace my previous DIY project, 2.1 of 2 x lm1875 + 70watt bjt amp which sounds to weak to drive my 2 x 3ways especially the 12" woofer and my 10" subwoofer.
it runs and sounds well, with more detail and kicking on bass, for mid and hight freq i have to say that the previous lm1875 produce a little more natural sound.
i just realized that 1 chanel producing a smooth electrical noise, i thought its from coolcase near of left speakers. sound alike., but when i turn it off/on found yes, it was from my left drivers. so smooth, i find this problem two days after and i don't find this problem before, since test one by one of the three amp before instaling.
i put my suspicions for these points :
- The transformator is to small to supply power for alltogether runs amp, or maybe the capasitor bank? or the square transformator i/o toroids?.
- ETI amp is not match with LM3886 and eats most of all power supply.
- less grounding.. for i put the amp up near the roof.
- kitchen room is not suitable for any soundsystem except mini-compos, and the refregerator operation may infect to a/c in.
- long driver cables, its about 3.5 metres per chanel.
your input would might be kill this noise and solve my problem.
thks
its dual lm3886 + ETI 150watt ( 4 transistor ) powered by single square 10A transformator 220v/24V - 0 - 24V, 25A diode bridge and 2 x 12.000uf/50V and 2 x 8200uf/50v in paralel, and a pair of 100nf wima MKP/100v at the end.
i built this all to replace my previous DIY project, 2.1 of 2 x lm1875 + 70watt bjt amp which sounds to weak to drive my 2 x 3ways especially the 12" woofer and my 10" subwoofer.
it runs and sounds well, with more detail and kicking on bass, for mid and hight freq i have to say that the previous lm1875 produce a little more natural sound.
i just realized that 1 chanel producing a smooth electrical noise, i thought its from coolcase near of left speakers. sound alike., but when i turn it off/on found yes, it was from my left drivers. so smooth, i find this problem two days after and i don't find this problem before, since test one by one of the three amp before instaling.
i put my suspicions for these points :
- The transformator is to small to supply power for alltogether runs amp, or maybe the capasitor bank? or the square transformator i/o toroids?.
- ETI amp is not match with LM3886 and eats most of all power supply.
- less grounding.. for i put the amp up near the roof.
- kitchen room is not suitable for any soundsystem except mini-compos, and the refregerator operation may infect to a/c in.
- long driver cables, its about 3.5 metres per chanel.
your input would might be kill this noise and solve my problem.
thks