[sdiy] Re: Learning electronics (was Polyevolver)

[Bob Weigel]

The resistors with 'different background colors' are...in all likelihood 
capacitors also :-). Some caps have been produced which have a more 
glassy looking finish and are shaped and striped in similar form to 
resistors.  
   Some glass looking capacitors are high stability caps that are often 
used in oscillator circuits and the like.  I have a big bag of 390pf's 
in stock I seem to recall.  Usually fairly fine wires coming out of the 
glass case with a label wound inside.  Actually the dielectric material 
used is polystyrene in these though.  There are glass capacitors that 
use glass as the dielectric.  These only look glass on the outside.  
HEre's a page that shows different types.

http://www.interq.or.jp/japan/se-inoue/e_capa.htm

However they don't show the ones I know you are talking about there.  
And I dont' recall what kind of dielectric material they use in them.  
They don't fail too often unless they get smashed :-).  In most cases 
where they are used you can substituted a ceramic or mica type, 
especially in an audio circuit.
     Ok...anyway..ahem.  To 'clone your moog'...has moog cloning been 
discussed by congress yet?  Hehe.  Do you intend to like...photocopy the 
PC boards and edit them and create board copies and all?  Or hard wire?  
Anyway as you go along if there's a part in the schematic that you don't 
understand let us know and I'm sure someone can help ID it and source 
it. I can't recall what rogue uses for oscillators.  But other than 
what's used there sometimes, most of the stuff will be off the shelf I 
think. -Bob
Joseph Palermo wrote:

> I go to itt tech. I want to clone my moog rogue, several months ago I 
> took it to school to identify what some of the parts on the board 
> were. My teachers were no help, I asked them about tempcos and got a 
> blank look, same for those little glass bead caps that look like 
> diodes(I still don't know what kind of caps they are) the caps that 
> are box shaped, and why the resistors have different backround colors. 
> I've got both service manuals for the moog but they didn't help to 
> much in parts Id. Any pointers on how to clone my moog.
> E.OJ the Bum
>
>