[sdiy] Digital control

[Antti Huovilainen]

On Tue, 1 Mar 2005, Johannes Öberg wrote:

> Mark Verbos: Sorry, I didn't read your post properly, so I didn't
> notice you wrote they used digital pots. Unfortunately, those are so
> expensive...

You can use an OTA to implement voltage controlled resistor. There is an 
example in LM13600 datasheet. I believe you can also use some multiplying 
DACs to make digital potentiometers.

Antti

"No boom today. Boom tomorrow. There's always a boom tomorrow"
   -- Lt. Cmdr. Ivanova