bad precision pot?

[Fraser, Colin J]

> -----Original Message-----
> From: jorgen.bergfors at idg.se [mailto:jorgen.bergfors at idg.se]
> Sent: 10 August 1999 10:16
> To: martin.czech at intermetall.de; synth-diy at mailhost.bpa.nl
> Subject: Re: bad precision pot?
>  
> >So far I've never encountered any problems with cermet 10 
> turn trimmers.
> <>But it is true that they are not made for many thousands of 
> revolutions,
> >the cermet film is said to suffer. They are made for 
> ocasional trimming.
> 
> Well, the settability isn't always as good as you might 
> expect. You often have to turn quite a bit befor anything 
> happens. And if you turn too far and have to turn back, there 
> is even more "dead" travel befor the setting changes. I'm not 
> sure if the setting changes if you knock on them, but it 
> could. Read Bob Pease's book and see what he thinks about 
> multiturn trimmers...

I've not noticed these problems with the multi-turn presets I use.
I'd take multi-turn trimmers over single turn trimmers for vco scaling any
time.
Maybe Bob Pease buys his parts at Radio Shack...

I'll need to crack a spare one open and see what's inside.


Colin f