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Started by yiancar, October 13, 2013, 10:20:27 PM

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yiancar

its basicly a beogram 2000. yep ivegot a converter :). should i mess with its wiring or the problem maybe on the preamp?

peranders

You must somehow break the ground loop. Your RCA terminals must not be connected to the chassies.
/Per-Anders Sjöström, owner of this forum

Homepage with my DIY hifi stuff

yiancar

any other things i should check for a ground loop?

peranders

Is the TT chassis going through the adapter in someway?
/Per-Anders Sjöström, owner of this forum

Homepage with my DIY hifi stuff

yiancar

through? in what way?

peranders

If you measure the resistance between your ground in your phono plugs and the chassi in the TT, which value do you get, high or low resistance?
/Per-Anders Sjöström, owner of this forum

Homepage with my DIY hifi stuff

yiancar

ok fixed the ground loop, it was the wire going from the rca to the input pins. now my toroidal transformer is causing hum. i have it a good 5cm away from the power supply part of the board but i can still hear it. perhaps its a cheapo transformer? any suggestions for a fix and a quality transformer ?

peranders

Good the you fixed the ground loop.

Is it mechanical noise from the transformer?
/Per-Anders Sjöström, owner of this forum

Homepage with my DIY hifi stuff

yiancar

what do you mean mechanical?

peranders

Is it vibrations or can you hear in your speakers?
/Per-Anders Sjöström, owner of this forum

Homepage with my DIY hifi stuff

yiancar

i can hear it in my speakers, changes with the orientation and proximity of the transformer and the board

peranders

OK, then you have magnetic coupling. A small toroidal transformer would probably do the trick.
/Per-Anders Sjöström, owner of this forum

Homepage with my DIY hifi stuff

yiancar

i already have one in an aproximate distance of 5 cm ( the outer from the pcb) and its still picking up noise. maybe it is missfunctional? btw i can hear the noise only with the volume of my amp at 3;4 and above

peranders

You say noise, you don't mean hum? Does it go away if you move the transformer?
/Per-Anders Sjöström, owner of this forum

Homepage with my DIY hifi stuff

yiancar

hum i mean yes. yes woth the trasnformer further away, ( out of the case) the hum dissapears. is it normal fora such a transformer to need so much distance?