AW: AW: The merlin project. Update and tip.

[Haible Juergen]

	>My point here is that if they can withstand being fired up at
50 G and then
	>survive crashing to earth a thousand miles down range, I think
they'll
	>survive almost anything you could do to them in the process of
filing.
	>
	>It is true that metal might get into your circuit board if you
filed them
	>in-circuit. But I never actually thought of doing it like that.
It's worth a
	>thought though. The main idea here is to trim up a resistor
before you
	>insert it in circuit. 

Trimming (filing) in circuit would be the big deal. Imagine tuning
a filter bank. Measure capacitors, then do some calculations
and select resistors, or combinations of 2 resistors in series.
Lot of measurment and calculation involved. If you can trim
the resistors in the living circuit, just feed in a sine with the right
frequency and file until the amplitude at the output reaches the
peak. Same as with trimpots, only that you have better long term
stability
and tempco.

	>So that's basically the deal. Now Juergen, Tell us about the
ceramic
	>capacitor thing.

Not much more to tell. Still don't know if it's true. Someone mentioned
in some old String machine (Solina ?) the caps that form a pulse to a
saw wave would be ceramics that were cut until the value was ok.
Now that's what I *heard*, forgot from whom (on AH, probably).
It may have been a joke, or it may be true.

JH.