my pre instrument

[digi01]

the pre is design for interconnect a wide range of voltage levels.
it is based on opa2227.i do fast air wiring.
pics below
zang

 

[digi01]

details,

 

[digi01]

interconnected with my digital piano.

 

[danielwritesbac]

NICE!!

What amplifier do you use with it? I'm curious.

 

[digi01]

i use Brian's lm4780nigc and my 3886igc

zang

 

[huy5005]

I always love your fast air wiring style . I will try to do it some time 'cause i have some 4562 op amp and enjoy an instant "pre amp " experience.... good job zang...

 

[digi01]

the attached is a instruction of the air wiring connections.
i use a 23 steps shunt type pot.you can use standard stereo log pot.
the file can print to A4 paper.
zang

 

[digi01]

again,the attached zip pkg include home etch pdf files.feel free to work on it

the pcb layout is star ground concept,i recommend pcb beginner take a look.hope its useful

zang