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alas, I roll my own interconnects, so I don't really have a recommendation for anything retail.
Now we'll take on the input switch. We have a DPDT for 2 source inputs. It has 6 solder lugs as you can see. The center two are the L/R outputs. The outer two are Source 1 L/R and Source 2 L/R. Hopefully the pics convey what goes where easily. Source 1 RightSource 1 LeftNow into the appropriate holesAs you can guess, the center two will go the middle, and the Source 2 L/R will be soldered to the bottom two on the board.That's it for today. The Digikey stuff comes in tomorrow (I used spare resistors for this build), and I'll continue then.
Or it doesn't matter as long as I am consistent with L and R - like all Ls on one row and all Rs on one row?Thx!
Btw, for the Alps Pot, is the G O I the same layout as PEC pot? like from left to right, G -> O -> I when the shafe facing me.Thx!
correct
I have one question:- what would be the single, most influential (sound characteristic wise) part in this circuit ?
How did you do that? Could I use regular wires and put them in plugs? I bought quite some 20 awg apex jr wires and that would be a fantastic idea if I can use these to make interconnects. Where to source RCA plugs?
"Hum..." Ground Noise?So I hook it up tonight. It works! However, the right channel has big "hum" sound. I put the board open. No boxes, laying on the carpet. Interesting enough, when I touched the power caps - the hum lowered or disappeared. When I lift the board, the hum sound would decrease. When my hand touching the back of the board, resistors and JEFTs, left channel will have hum sound and noise will increase. Not sure what to do. Any advises are appreciated!
? just laying on the carpet? How about getting it on a proper surface of some kind instead of static-y carpet and pics are always a big big plus...
So I rechecked all solder joints and fixed some - the situation is the same. I put the board on a MDF and lift it so no direct contacts with the board from the bottom (picture below) - no changes.The situation is now like this: When I hook it up (Class D amp), I turn the volume to minimum, input switch to the correct input (either 1 or 2), and there will be "Buzz or Hums" from the right channel. When I turn the volume to maximum, "Buzz and Hums" will come out from both channels. If I touch the bottom of the left most resistor, there will be big hum/buzz from the left channel (regardless of whether there is input signal or not).When music is coming from Input 1 and I set the input switch to "Middle" or "input 2", if I turn the volume all the way to maximum, I can hear the music playing in low volume along with big hum/buzz. I feel like the sound is "leaking". Is that normal?
The middle position for the switch should be 'off' so there should be no noise/sound at all. My guess is the switch/pot wiring is off. Could you take a closer pic or draw a diagram of how you wired the switch and alps?
Finally got my b1 up and running in a temporary enclosure. I can't believe how good this sounds. I am using cheap pots from radio shack until the stepped dact type attenuator gets here. Even so the sound is fantastic and dead silent. Many thanks to Wushuliu for starting this thread and all the work including the parts list. Also thanks to Mr. Pass for bringing this to the DIY community. I can't wait to get the attenuator and permanent enclosure and finish this up. Just a heads up for those that are going to use only one source. The inputs can be jumpered as I did so you don't have to buy a switch and wire it up. Thanks again everyone
Still looking for the enclosure Parodielin. I may end up making one myself. There is a place online that sells aluminum sheet up to an inch thick and they will cut to size.
