Thanks for getting back Derek, Wyn Sachin.
I guess making the phono amp switchable between MC & MM kind
of defeats the purpose of the project with the ready made board,
unless a simple switch etc can be improvised somewhere.
Otherwise is designing and laying out a brand new board
configuration in which I have no experience doing.
I have a few very nice op amps in PDIP as I've said, including
the AD797. LME4990 (adapter) the tin can versions of LME49710,
LME49720. LT1468, a smattering of OPA134, OPA2134,
and some of the other LT devices. I'm just not experience
with them yet.
I was a tube guy then got into test and measurement and ran
into some problems trying to upgrade some HP test gear. So
I went back to school to learn electronics and should finished up
with a little Electrical Engineering Technology: Associates at my
local community college next semester or next fall depending on
the if I can handle the course load and find a two day afternoon
day care for my little girl. Everyone wants you to book 5 days a
week...but that is another story.
I've got preamps that can do some of this I assume, and the turntable
a Thorens TD-147. It's opamps are dated and include the following:
MC34001 Single Opamp
LM324 14 Pin opamp
BC547 Transistor
BPW34 OSRAM, Si PIN Photodiode, suitable from 400nm to 1100nm.
Still available? Yes, cannabas' bandwidth is about center in that range.
4x1n4150 = Bridge.
I've got the following pre amps with their Phono sections:
Audio Research SP3A1 & SP-10 along with a Marantz 3250.
However I'm not a design guy, I'm more of a nuts and bolts kinda guy.
Do we want to review schematics build something into these or keep it
external and interface to one of these?
I don't want to Hijack the thread, but I do need more information to move forward.
Its kind of not so fun to build the wrong something then find it won't work out.
As I look through various threads, sites, forums, many are out there for review
yet many are not supported by any measurement data so how do we sort it
all out.
It also seems that most of the designs, boards, kits are for MC cartridges.
So do I look at Walt Jungs stuff? Nelson Pass? Look at various Handbooks?
Find Samual Groners research?