universal chip pre-amp project

[will_raymo2000]

Put me down for Beta testing this board as well. Looks very exciting!

 

[digi01]

sounds interesting.. would you be able to provide pcbs?

tent:wq

Put me down for Beta testing this board as well. Looks very exciting!

Yes,i would like provide pcbs.i have sent the UCP_v0.1 cam file to the pcb house.

P.S.
for a completed design.i have no idea about the power supply part.i will try standard fix regulated psu or batteries.
i think DC detection,RF filtering is useful function too.thanks A.T.
i do not like dc servo,it is too technical,short of human interest.

zang

 

[digi01]

Atilla,
for you information,the attached is a original pcb work of ucp_v0.2.i use smt resistors.

 

[digi01]

bottom layer

 

[digi01]

top layer

 

[peranders]

Nice work but have you checked the trace width of the output? Very thin. I would also make the solution more compact. Put the buffer closer to the opamp.

 

[digi01]

here is smt version of ucp_v0.1,all resistors is 0805 packaged.
it is very compact very simple.pcb size is 40mm x 40mm.

have fun

 

[digi01]

bottom layer

 

[peranders]

Where did the buffer go?

I would recommend you have to have more isolation between the screwholes and the groundplane.

Strive to have all SMD parts on the upper side, more practical.

Have the main groundplane on the solderside but you can also have groundplane on the top side but it will hardly be a better ground but it looks nice.

The hot relief pads for the connectors have very thing traces. You can have fatter hot relief at some pads you know. The ground connections could be better and you could also tune the pads size. I think they look rather big right now.

 

[digi01]

Nice work but have you checked the trace width of the output? Very thin. I would also make the solution more compact. Put the buffer closer to the opamp.

P-A,
thanks for the comment.i use 20mil width track in the signal route.it is a decent value.

Where did the buffer go?

P-A,
there are two design.the basical design(ucp_v0.1) is simple 2 dual opamp.the other design(ucp_0.2) is opamp gain stage with LME49600 buffer output.

Zang

 

[peranders]

You have not 20 mils on the first design. I think you have 10-12 mils tops. You route a trace between the SO08 footprint. Check the connections to the buffer.

 

[digi01]

You have not 20 mils on the first design. I think you have 10-12 mils tops. You route a trace between the SO08 footprint. Check the connections to the buffer.

yes,you are riight.there are thin routes

is this ok?

 

[digi01]

the trace between the SO08 footprint is signal level,so i use thin route to keep the trace clear.

any ideas?

 

[digi01]

The hot relief pads for the connectors have very thing traces.

the pads for the connectors is not for hot relief.the reason i use bigger pads is for physical strong.cause it is industrial screw connectors.
i add teardrops around the pads,this is my first time use teardrops function.
i have setup grounding relief via pads near the signal input and output for better top layer grounding.

the attached is modified ucp_v0.1 smt.

 

[will_raymo2000]

Let me know when you have some prototypes and I will be more than happy to demo one of them for you!

Will keep an eye on this thread, looks like it could be very useful!

 

[digi01]

I do a overall test last weekend.there are three module.

1,PDIP LM4562
2,SMT LM4562
3,NE5534 with LME49600

the test result is so good so fun.cause there are only few resistors and opamps in the signal route

Zang

 

[digi01]

module details

 

[tent]

Wow.. great!
Well I just have a couple of spare PDIP LM4562 left over around home..
And your listening impressions??

tent:wq

 

[digi01]

its sound detail,nature and graceful.
fyi,my gear list below:
1,pc audio--->lm4562 ucp_v0.1--->hd580 headphone
2,cd player--->ne5534 with lme49600 ucp_v0.2--->hd580 headphone
3,pc audio--->lm4562 ucp_v0.1--->lm3886 inverted poweramp--->kef coda7se loudspeaker


zang

 

[tent]

great.. I'd test it with a setup similar to number 3..
how could we agree for a demo shipmentz?

tent:wq