All --
There's a few other things I completely forgot
to mention that we need to put on the website...

Comment #1:
When the users select resistors it is recommended to
use only 1% precision metal film resistors*1*.
Carbon resistors & wire wound resistors have bad
characteristics that cause noise, thermal drift, and
excess capacitance that can throw off the filter.

*1* (The 0.1% is okay as well, but not necessary.)

Comment #2:
According to MAXIM, the manufacturer of the MAX275,

	DO NOT SOCKET THE RESISTORS!

    They should be soldered in place.


Comment #3:
EXTREME care should be taken if removing the resistors
from the PCB -- this is an art that requires skill.

When doing this procedure it is important not to damage
the board by lifting traces or ripping out the plated-
through holes. This can happen from an iron that's too
hot or holding the iron on the board for a time longer
than necessary.  It is best to keep the heat on the
soldering iron regulated and use a desoldering tool
and try to work as quick as possible so not to damage
the board.


/Ray

-----Original Message-----
From: Ray Mitchell [mailto:rmitchell@sun.stanford.edu]
Sent: Wednesday, October 10, 2007 12:08 PM
To: Deborah Scherrer; Tim Huynh
Subject: RE: SID Tuning Resistor Tables


Debbie, Tim,
Were you planning on putting all of the different Q's
on the web or just the last one?

If you publish a table for each case, as Tim pointed out,
then the user can choose which resistors to select based
on need or situation.  Just a little blurb on how the
user selects this is probably all that is needed.

 # # #

For our production, I have listed the Serial numbers
of the frequency boards and the resistor values used
along with particulars about each stage and the totals.

For NAA value we changed the resistors late in the
production since we were having tuning problems.
This explains why NAA is listed twice at the end.

Users can match their SIDMON FB-xxxx serial number
to find out what approximately what they have inside.

/Ray -- Production Information follows:
*** BEGIN ***

Here's how to read the information:

For each frequency, the resistors are R1 thru R4
On the Printed Circuit board they are R101 thru R104
for Freq A and R201 thru R204 for Freq B. The resistor
values are identical for each stage/ Frequency Filter:

R1 = R101 = R201
R2 = R102 = R202
R3 = R103 = R203
R4 = R104 = R204


Production NLK (24.8 KHz) S/n: FB-0004 thru FB-0299
Q(each stage)    =  170.180,  Total Qt=  240.671
Gain(each stage) =    2.745,  Total Gt=    7.535

Resistors:
	R1 = 200.0 K
	R2 = 76.8 K + 3.85 K (pot)
	R3 = 549.0 K
	R4 = 75.0 K



Production NML (25.2 KHz) S/n: FB-0004 thru FB-0299
Q(Each stage)    =  172.946,  Total Qt=  244.583
Gain(Each Stage) =    2.745,  Total Gt=    7.535

Resistors:
	R1 = 200.0 K
	R2 = 76.8 K + 2.56 K (pot)
	R3 = 549.0 K
	R4 = 75.0 K



Production NAA (24.0 KHz) S/n: FB-0004 thru FB-0259
(with a few exceptions in the s/n FB-02xx series R2 = 79 ohms and R4 = 76.8
K)
Q(Each Stage)    =  164.077,  Total Qt=  232.039
Gain(Each Stage) =    2.745,  Total Gt=    7.535

Resistors:
	R1 = 200.0 K
	R2 = 76.8 K + 6.85 K (pot)
	R3 = 549.0 K
	R4 = 75.0 K



Production NAA (24.0 KHz) S/n: FB-0260 thru FB-0299
Q(Each Stage)    =  164.667,  Total Qt=  232.874
Gain(Each Stage) =    2.745,  Total Gt=    7.535

Resistors:
	R1 = 200.0 K
	R2 = 80.6 K + 2.75 K (pot)
	R3 = 549.0 K
	R4 = 76.8 K



*** END ***