MOTM

In a message dated 4/12/2000 11:50:51 AM, djthomaswhite@... writes:

>So what values in the voltage divider would I need to 
>scale down to 10v?

It might be worth it to get a basic electronics book (like those ones they 
have at Radio Shack, if not a better one).

Here's the general formula for a voltage divider:

Vout = Vin (R2/(R1 + R2))

where R2 is the resistor connected to ground on one side, and R1 is connected 
to positive on one side.

Specifically:

10 = 15 (R2/(R1 + R2))
divide both sides by 15

2/3 = R2/(R1 + R2)

so, if you choose R2 to be 100K then R1 would be 50K -- I'd want to stay in 
this (100K) range unless someone smart speaks up. There are other ways to 
accomplish this, but I wouldn't use successive diode drops (like 0.6V each) 
or a regulator (zener or otherwise) -- too much hassle. Especially since R2 
might be a pot you already have as an attenuator, and you could just hang R1 
off the back of that same pot PAiA style.

JB