GB for DC coupled B1 buffer with shunt PSUs

[Praudio]

May I use (IR) IRF9540 and (IR) IRF540 to replace IRFP9240/240 in Salas DC B1 black boards.

 

[Salas]

It will probably work, but its never tested before in this. Its also not as good for some mosfet capacitances. But not too far.

 

[Tea-Bag]

up to 70 boards so far. This round is going better than expected.

 

[CaliCanjaros]

So if i get this right, Mesmerize board will ship after all? Despite the low interest?

 

[Tea-Bag]

So if i get this right, Mesmerize board will ship after all? Despite the low interest?

Yes, I will be ordering 25 of them minimum.

 

[DimZ]

hi Mike ..

just added 3 Hypnotize boards ...

 

[CaliCanjaros]

Great.

Count me in for one Mesmerize.

I removed the Hypno from the document and added a Mesm.

 

[Tea-Bag]

If you have recently put your name in the sheet, please look again.
Someone after highfieldrebel has no diyaudio member name in there.

 

[Tea-Bag]

76 total boards so far.
Paypal payments can start next week.
Remember we are donating $1 per board to Diyaudio forum.

 

[Tea-Bag]

Some photos of the boards.

First one is the Mesmerize shot
Second one is the Hypnotize shot
Third one is proto of the Hypnotize built up as a dual rail shunt supply, using 4x 10,000uf 50v panasonic caps.
(Single rails are fine to).

 

[samoloko]

up to 70 boards so far. This round is going better than expected.

can we expect better then 15 usd prices If the count Is more than 100

 

[Tea-Bag]

can we expect better then 15 usd prices If the count Is more than 100

Doubtful - I would have ordered 100 pieces anyways to get the cost in alignment a bit. There becomes a larger price drop after this only at about 250 pieces.

 

[tstrewth]

Sorry for the noob questions but I want to build a chip-amp using LM4780's in bridged mode that requires a balanced input. Is it possible to use the B1 buffer with a balanced input/output?
Or, any way to get a balanced output out of the buffer with a SE input going into it?

Thanks

 

[AndrewT]

if most of your equipment is unbalanced then stay unbalanced all the way through.
Add an unbalanced to balanced converter to the front end of the bridged amplifier.
Cordell shows a nice discrete version using jFETs.

 

[JBdV]

MIRACLES DO HAPPEN SOMETIMES !!!!!

I just received the 3 Mesmerize boards !!!

After more then 4 weeks in shipping ......

I had given up on them already

regards,

Jan

 

[grubyhalo]

if most of your equipment is unbalanced then stay unbalanced all the way through.
Add an unbalanced to balanced converter to the front end of the bridged amplifier.
Cordell shows a nice discrete version using jFETs.

Could you please point out the location of the circuit, I was not able to find it here. Thanks.

 

[Salas]

MIRACLES DO HAPPEN SOMETIMES !!!!!

I just received the 3 Mesmerize boards !!!

After more then 4 weeks in shipping ......

I had given up on them already

regards,

Jan

Hey, they have a life of their own!😀

 

[samoloko]

 

[AndrewT]

Add an unbalanced to balanced converter to the front end of the bridged amplifier.
Cordell shows a nice discrete version using jFETs.

Could you please point out the location of the circuit,

Sorry, I have mislead you.
Cordell's addon is a balanced to unbalanced converter.
He converts an unbalanced amplifier to balanced input.

as I first said, you need an unbalanced to balanced converter.

 

[grubyhalo]

...

as I first said, you need an unbalanced to balanced converter.

Could you please point me out to a circuit that does it? Thanks.