[sdiy] Vernier Dials Question

[Paul Perry]

At 12:07 PM 10/08/02, Scott Gravenhorst wrote:

>When I was a kid, my dad had a tube radio that had a vernier tuner.  Very
>nice in those days.  The vernier mechanism was rather large, the large
>portion being some 4 inches wide if I remember.

This reminds me  that some radios had a small variable cap in parallel with 
the main cap, you set the small one halfway & then after getting close with 
the main cap you tweaked with the little one (this was common on 
transistor portables trying to get 20Mhz of shortwave on one dial).
No reason why you couldn't put a trimmer like this across the tuning cap of an 
analog oscillator, it might affect the temperature stability a little, but 
still might be worthwhile if you need to be able to make very fine tuning 
adjustments as you play.

paul perry (Frostwave analog fx) Melbourne Australia