since this is my first post and thread i'll make an introduction as well.
i am a twenty year old male from norway(north-europe).
my profession (can't realy call it that since i don't make any money of it yet) is sound-engineering, illustrator, and
everything multi-media stuff.
i do everything from designing computer-cooling, chasis, creating comics and music, animation, etc, etc.
you get the idea.
i'm in the beginners phase of things, so i have alot of projects/ideas but almost none are finished.
The neve 1073 project...
about three years ago i read this book called "make mine music" by bruce swedin.
for those who don't know, he has mixed alot of michael jackson's albums.
in his book he "praises" the 1073.
it was the first time i heard of it, but i knew at once that i wanted one.
so i went to my friend google and began researching on how to build one.
after a couple of months i put the project on hold understanding that i
did not have the knowledge to pull it off.
in the years between then and now i have taken up the project just to put it down again,
but have allways learnt something new.
and now it's time to start again.
this time i feel alot more confident.
about half a year ago i got past some kind of barrier. i have allways learnt and understood things fast,
but after i got past that barrier i got to a complete other level of understanding.
i have no problems digesting information/knowledge and resonating it.
enough about me.
i soon realised that building a 1073 was to ambicious, so i wanted to simplify it.
so i ended up with an idea of just using the ba283 board as preamp.
but then the problem is pricing, switches and transformers are expensive.
my idea is to build the ba283 board with op-amp circuitry instead of transformers,
and using unstacked switches at each gain stage and one on the transformer/op-amp input
since these are at 1/10 the price of stacked once.
i also want to build a psu that powers the ba283, and op-amps.
if i could build this i would have a cheap neve based preamp that easily can be upgraded to a true neve replica.
it is also a good project to find the actual difference between op-amps and transormers.
this project probably has many flaws, thats why i post it here (duhu) so it can become flawless.
here are the link for the ba283 board http://members.nuvox.net/~zt.robgrow/circuits/neve/neveba283.html
here are the link for the ba283 board preamp http://members.nuvox.net/~zt.robgrow/circuits/neve/nevemicpre.html
for the the transformer substitute i thought of using an ESP project http://sound.westhost.com/project87.htm
i don't know if the input impedance are right though?
for phantom powering i thought of using this ESP project http://sound.westhost.com/project96.htm
for powering the op-amps i would use this ESP project http://sound.westhost.com/project05.htm
would it be possible to use the same circuit above for the 24v just switching the transistors to -24 and +24 ?
on the ba283 M, and N pins are connected to +24VDC
A, and V pins are connected to common.
is common 0volt the center pin of the transformer?, or is it -24VDC?
i also want a pot on the output to tune the output down if i want to gain alot.
what values should that pot be? 10k?
this wil be my first "real" DIY electronics project, i have seen some projects that resembles this one but not quite like it.
so any help, links, etc would be gratefully accepted.
if you know of a better solution for some of this please tell.
ashankan
i am a twenty year old male from norway(north-europe).
my profession (can't realy call it that since i don't make any money of it yet) is sound-engineering, illustrator, and
everything multi-media stuff.
i do everything from designing computer-cooling, chasis, creating comics and music, animation, etc, etc.
you get the idea.
i'm in the beginners phase of things, so i have alot of projects/ideas but almost none are finished.
The neve 1073 project...
about three years ago i read this book called "make mine music" by bruce swedin.
for those who don't know, he has mixed alot of michael jackson's albums.
in his book he "praises" the 1073.
it was the first time i heard of it, but i knew at once that i wanted one.
so i went to my friend google and began researching on how to build one.
after a couple of months i put the project on hold understanding that i
did not have the knowledge to pull it off.
in the years between then and now i have taken up the project just to put it down again,
but have allways learnt something new.
and now it's time to start again.
this time i feel alot more confident.
about half a year ago i got past some kind of barrier. i have allways learnt and understood things fast,
but after i got past that barrier i got to a complete other level of understanding.
i have no problems digesting information/knowledge and resonating it.
enough about me.
i soon realised that building a 1073 was to ambicious, so i wanted to simplify it.
so i ended up with an idea of just using the ba283 board as preamp.
but then the problem is pricing, switches and transformers are expensive.
my idea is to build the ba283 board with op-amp circuitry instead of transformers,
and using unstacked switches at each gain stage and one on the transformer/op-amp input
since these are at 1/10 the price of stacked once.
i also want to build a psu that powers the ba283, and op-amps.
if i could build this i would have a cheap neve based preamp that easily can be upgraded to a true neve replica.
it is also a good project to find the actual difference between op-amps and transormers.
this project probably has many flaws, thats why i post it here (duhu) so it can become flawless.
here are the link for the ba283 board http://members.nuvox.net/~zt.robgrow/circuits/neve/neveba283.html
here are the link for the ba283 board preamp http://members.nuvox.net/~zt.robgrow/circuits/neve/nevemicpre.html
for the the transformer substitute i thought of using an ESP project http://sound.westhost.com/project87.htm
i don't know if the input impedance are right though?
for phantom powering i thought of using this ESP project http://sound.westhost.com/project96.htm
for powering the op-amps i would use this ESP project http://sound.westhost.com/project05.htm
would it be possible to use the same circuit above for the 24v just switching the transistors to -24 and +24 ?
on the ba283 M, and N pins are connected to +24VDC
A, and V pins are connected to common.
is common 0volt the center pin of the transformer?, or is it -24VDC?
i also want a pot on the output to tune the output down if i want to gain alot.
what values should that pot be? 10k?
this wil be my first "real" DIY electronics project, i have seen some projects that resembles this one but not quite like it.
so any help, links, etc would be gratefully accepted.
if you know of a better solution for some of this please tell.
ashankan