• These commercial threads are for private transactions. diyAudio.com provides these forums for the convenience of our members, but makes no warranty nor assumes any responsibility. We do not vet any members, use of this facility is at your own risk. Customers can post any issues in those threads as long as it is done in a civil manner. All diyAudio rules about conduct apply and will be enforced.

USSA-5 PCB GB

Jump to Latest
#281
meanie - 2 pcs (BJT)
Vunce - 2 pcs (BJT 5.1) 🙂
Brianco - 2 pcs (any colour) Yes Please 🙂
boba1000 - 2 pcs
FAA - 2 pcs
Funke - 2 pcs
gary s - 2 pcs (Toshiba mosfet drivers) (any colour) 🙂
Potstip - 2 pcs (BJT 5.1) 🙂

Running Total = 16 pcs.
 
#284
Hi fab,

I am a bit confused as to what pcb does what, in the last few posts you mention the USSA5 and USSA5.2 use the same pcb. What is the difference in the 2 versions. I assume 5.2 is the latest pcb for the mosfet drivers?

Then there is mention of the USSA 5.1 for BJT drivers - have you published info on the BJT circuit and details of which transistors you are using?

In your opinion, which version is the best - maybe a hard question to answer, but I thought I would ask anyway.

Based on your answer, I might change from mosfet drivers to the BJT one.

Regards,

Gary..
 
#285
fab said:
Hi Brian
No you are not too late. Note that the USSA5 and USSA5.2 use the same pcb version.
I thought you already have USSA5 pcb?
Fab
Click to expand...


Hi Fab,

A different 'Brian'🙂

Yes, I have one set - but want another for a friend, hence my confirmed interest. I take it that the UK postage will be the same as for my USSAPA boards? If so I will add that same sum to my payment.
 
#286
Gary
I am sorry I made a typo. Ussa5.2 should have read ussa5.1 and yes they use the same pcb.
It does not matter which version (5 or 5.1) I am curious who wants to try out version 5.1 with darlington bjt as driver instead of mosfet since I need to update the build manual for this version.. unfortunately I only have one channel mounted of USSA 5.1 so I cannot really test for sound comparison. However, v 5.1 was fully electrically tested fine. I believe that meanie and Vunce Have offered to build the version 5.1 after version 5 to compare.

I will publish the differences in parts between USSA 5 and 5.1 since it will be faster for me than to publish the updated manual (which will be eventually updated).

Fab
 
#288
Thanks for the update Fab, can you let us know the BJT parts difference before the pcb GB is closed in case I want to change my mind, but as you mention the pcb's are physically the same, so as I understand it there are not 2 different versions of the pcb to suit either the mosfet or BJT driver amp design - is that correct?
 
#291
I want a pair too!

--------------------------

meanie - 2 pcs (BJT)
Vunce - 2 pcs (BJT 5.1) 🙂
Brianco - 2 pcs (any colour) Yes Please 🙂
boba1000 - 2 pcs
FAA - 2 pcs
Funke - 2 pcs
gary s - 2 pcs (Toshiba mosfet drivers) (any colour) 🙂
Potstip - 2 pcs (BJT 5.1) 🙂
mbrennwa - 2 pieces

Running Total = 18 pcs.
 
#292
fab said:
Hi Brian
No you are not too late. Note that the USSA5 and USSA5.2 use the same pcb version.
I thought you already have USSA5 pcb?
Fab
Click to expand...

Yes, I have the original. Just starting the planning for the heatsinks/power supply/chassis. I’m trying to use parts I have in stock for this build. I want to support your efforts and also to compare BJT vs mosfet drivers going forward.

Brian
 
You must log in or register to reply here.
Top Bottom