Mezmerize B1 Buffer Preamp

Jump to Latest
G

glennjarrett

Member
Joined 2010
G

glennjarrett

Member
Joined 2010
Hi Salas

Happy New Year

Yes its a bit fiddly at first but i soon got the hang of it with a pair of tweezers
and a big magnifying glass

i let the fets warm up for 30 seconds then tested with 10v 100R sorted into idss groups
then soldered onto sot23 adapters then tested again with 10v 100R on breadboard 10 at a time
again once set up power on then leave them for a few minutes then measure the voltage across 100R
then ran the trace on the dca 75 a bit of a faf but worth it

would be quicker with 10x sot23 test sockets on veroboard but i cant find any and the peak ones are £20 a pop !
 
Last edited:
Salas

Salas

diyAudio Chief Moderator
Joined 2002
Paid Member
Has to do with this PSU's betterment when burning more internal current. Lowering output impedance and rail modulation harmonics from the load.
Most users found 200mA a good compromise before it gets more and more thermally inefficient for smaller and smaller subjective benefits returns.
 
D

drewburn

Member
Joined 2012
I recently decided to build a Mezmerize Buffer. However, when it came to ordering the PCB's from the store, I was in for a shock. I live in the UK, and found that I had to spend $200, to order from the store (the post brexit position). This meant that I would have to buy 8 units. I don't need 8 Mezmerize PCB's. So, if anybody wants to purchase from the UK I could have 6 PCB's for sale. The price, less UK import tax, is $217.09, So it would cost you 217.09/8 plus tax.
If there is anything else someone wants from the store of "low value, below $200, we may be able to work this out. However this is a one off suggestion to get me the Mezmerize boards
If you are interested please PM me.
 
umut1001

umut1001

Member
Joined 2007
hiendparadise.com/
glennjarrett said:
Finally got round to swapping the 10 X 2SK170BL out for the 2 X 2SK209GR on adapters 4 matched and 6 un matched
Works very good and the dc off set is lower than the 2sk170bl's so it looks like a better matched quad
sounds really good indeed

https://flic.kr/p/2kpwzeE20210106_100534 by glenn jarrett, on Flickr
https://flic.kr/p/2kpAoJB20210106_100454_001 by glenn jarrett, on Flickr
https://flic.kr/p/2kpAoH420210103_151909 by glenn jarrett, on Flickrhttps://flic.kr/p/2kpAYhEdca by glenn jarrett, on Flickr
Click to expand...

Hi Glenn.
Great job!Beautiful.Did you use 2pcb for replacing 2sk170? When soldering back to back on this sot23-3 pinouts are being different if soldered back to back in single pcb.How did you do it?.Thanks and regards Umit
 
umut1001

umut1001

Member
Joined 2007
hiendparadise.com/
Oh I see,it is like this right?
Google Görsel Sonucu
It seems D and S pins identical.
So soldering back to back on single pcb will be ok.
Then it is great. I have thousands of 2sk209gr.And hundreds of this adapter.Now I should buy a tester but peak one seems a bit pricey.And our customs charges much too.Any China alternative? Thanks and regards
 
Last edited:
G

glennjarrett

Member
Joined 2010
you dont need a peak just use the same method as testing idss on ordinary 2sk170bl the problem is the sot23 test sockets i have a peak one but it would be a lot quicker to test say 10 at a time all at the same temp but i cant find any for sale be careful some look like sot23 but are 6 pin
url], on Flickr
 
umut1001

umut1001

Member
Joined 2007
hiendparadise.com/
Yes testing 10pcs together would be very nice but we can not find any.Do these adapters are enough for cooling ?
I thought building pcb single sided paralelled and other side copper for cooling.But maybe it may not be necessary.
Have you measured temperature of 2sk209s by Ir thermometer?How many Celsius above the ambient temperature?Thanks for your help
 
You must log in or register to reply here.
Top Bottom