Bosoz

[kennethrl]

I just rounded up the parts for the BOSOZ. I ordered the Diode bridge from Digikey (for the power supply) #2KBP02M-ND. It appears to be a 4 pin rectifier and my PCB is set up for a two device. Any suggestions?

Also I am planning to make a wooden case for the Preamp. Does it need a metal case around it for shielding?

[steenoe]

It appears to be a 4 pin rectifier and my PCB is set up for a two device. Any suggestions?

The original BosoZ board uses two 4-pin rectifiers. One for the positive and one for the negative rail. Generally speaking, you need two rectifier bridges. What boards are you using?

Steen.

[kennethrl]

Thanks for replying.....I was confused! I figured out where the bridge diode goes.

Do you see any problems with a wood enclosure?

[steenoe]

Do you see any problems with a wood enclosure?

I have no experience with wooden enclosures. You might want to think about where you place the preamp, on top of a big trafo in your poweramp might not be the best place.
Someone else with knowledge on this?

Steen

[harryeng]

Originally posted by steenoe
I have no experience with wooden enclosures. You might want to think about where you place the preamp, on top of a big trafo in your poweramp might not be the best place.
Someone else with knowledge on this?

Steen

Hi Steen, I have some experience with wood. Some people in Holland think it has a big impact on the sound, so they do everything in wood (including re-packing the capacitors in wood).

Some experiments with some of my own DIY gave an enlighting view and a somewhat confused sound. In the end I bought myself an experiment kit with Mu-metal and started rebuilding my Pass Ono case with lots of aluminium, copper and Mu-metal for the trafo's. The trafos do influence the sound, especially with small signals in pre-amps.

Greetings, Harry

[steenoe]

Hi Steen, I have some experience with wood. Some people in Holland think it has a big impact on the sound, so they do everything in wood (including re-packing the capacitors in wood).

Repacking caps in wood Wow, I heard of skinning caps, but not packing them in wood Is that sounding any better? Okay I know you can go to great measures to shield out EMI and so with MU-metal! I never heard of the wood thing, though. Thanks for replying, Harry I am sure our friend Kennethrl, is happy too As for preamps, I have had the best results connecting the circuit GND to the chassis. That would be more ore less useless, with a wooden chassis.

Steen

[kennethrl]

I wasn' t planning to put the preamp directly on the amp. It will be about 3 feet away. So, this can effect the sound? I guess the power supply should be shielded?

[steenoe]

Kenneth, 3 feet away makes you pretty safe Normally you dont have to shield the psu from the circuit itself. Just put the trafo in one corner and the preamp board itself in the opposite corner, so to speak. The more dist. between the two, the better!
If you need more info, speak right out.
Happy building and best of luck

Steen

[kennethrl]

Thanks for the help!!

I have another question I am going to have rotary switch to select inputs (CD, radio,etc). My local parts supplier told me that the negative inputs are put together(for both channels) and the positive are separate in the switch (it is a 3 pole 4 position switch is this a common and is it the right way to go?

[steenoe]

I have another question I am going to have rotary switch to select inputs (CD, radio,etc). My local parts supplier told me that the negative inputs are put together(for both channels) and the positive are separate in the switch (it is a 3 pole 4 position switch is this a common and is it the right way to go?

As I understand it, your supplier missed the fact that this is Balanced circuit!! Normally with single-ended input you just tie the GND's together! Do you have any balanced input sources?
If you do have a balanced source, you do not want to tie the neg. signal to ground! Please tell me a bit more If you have only single-ended input, you just put a jumper in the board from -in to gnd! Right and left channel are kept seperate.

Steen