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echo: tech
to: Roy J. Tellason
from: Wayne Chirnside
date: 2003-01-28 10:08:00
subject: Re: Dead system

-=> ROY J. TELLASON wrote to RUSSELL TIEDT <=-

 RJT> For that price I'd buy one too.  But my cartridge isn't of the magnetic
 RJT> variety,  it's ceramic,  so what preamp is needed is just a matter of
 RJT> impedance matching more than anything else.

 Ceramic is HV high impedence IIRC so a pair of op-amps
 one for each channel ought to do the trick.
 You need to scale down the input by selecting the proper
 input and and feedback resisors that meet at the summing point.
 Inverting op-amp configeration.
 Sorry my copy of the OP-AMP Cookbook didn't
 manage the last move with me.

 RJT> But first I gotta get the software working!

 RT>> Right now I'm in the middle of browsing a whole mess of README
 RT>> and HOWTO files plus there are assorted doc files that came with
 RT>> the burner,  pdfs and all sorts of other stuff.  Perhaps tomorrow
 RT>> if I get the energy I'll be able to get some hardware swapped
 RT>> around and at least make a start on geting the software side of
 RT>> things going...

 Right now I've a sea of loose computer bits and pieces strewn
 all over the place.
 Hey I've found an _advantage_ to software modems and
 sound cards!!! They just sit there dead in their PCI slots
 not in the least interfering with the Win 3.1 software
 and leaving everything accessable to my ISA cards :-)

 RT> Got the hardware part of it done,  anyhow.

Hardware is easy. I need to put that suspect RAM stick into the old
486 box and see what it posts to extended memory  and see where that 
problem was from.
I may in future depending on the result of above procedure try
removing the HS UART from this MB's serial port and putting it into the
old board. Don't know if my current skills and eyesight are 
up to the task however do know I'll need a solder sucker.

 RJT> Yeah.  Now all I need to do is figure out why it won't run!  :-(

Details, work for the government and this isn't a problem ;-)
 
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