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<DIV><FONT size=2 face=Arial><SPAN class=741353706-09042021>Hey
Team,</SPAN></FONT></DIV>
<DIV><FONT size=2 face=Arial><SPAN
class=741353706-09042021></SPAN></FONT> </DIV>
<DIV><FONT size=2 face=Arial><SPAN class=741353706-09042021>So, I've now got a
ton of orders for my little two-Dome-filter frequency shifter, which I've
figured out how to build in euro format (12HP, if you're curious). I hand
select all the film capacitors for the Dome filters so that they all have the
same (or nearly so) mantissas -- I try to get them either all within 0.2%, or
0.4% at worst. My phase displacement simulation tells me that this
gives very nearly perfect results.</SPAN></FONT></DIV>
<DIV><FONT size=2 face=Arial><SPAN
class=741353706-09042021></SPAN></FONT> </DIV>
<DIV><FONT size=2 face=Arial><SPAN class=741353706-09042021>Anyway, I ran low on
capacitors to the point where I couldn't put together decent collections for the
18-stage filter (I need 4 102s, 4 103s, 4 104s, and 6 105s for it). I
bought 250 each of the smaller values and 200 of the 105s. Tonight I
measured all of the 105s, thinking that they would ideally form a Gaussian
distribution around 1.000uF. Well, they were nearly all clustered between
about 1.030uF and 1.050uF, and in fact, about 20% of them were off spec (higher
than 1.050uF, and these are 5% caps). Not a single one of them was less
than 1.020uF. They are Kemet caps. So now I've got to hope that the
other values also tend on the high side of their tolerance ranges, or else I'm
going to have to buy even more caps.</SPAN></FONT></DIV>
<DIV><FONT size=2 face=Arial><SPAN
class=741353706-09042021></SPAN></FONT> </DIV>
<DIV><FONT size=2 face=Arial><SPAN class=741353706-09042021>I think I've given
myself a fool's errand here.</SPAN></FONT></DIV>
<DIV><FONT size=2 face=Arial><SPAN
class=741353706-09042021></SPAN></FONT> </DIV>
<DIV><FONT size=2 face=Arial><SPAN
class=741353706-09042021>Cheers,</SPAN></FONT></DIV>
<DIV><FONT size=2 face=Arial><SPAN class=741353706-09042021>Doc
Sketchy</SPAN></FONT></DIV></BODY></HTML>