analog circuit to compute sine of voltage

[D from BC]

Synchro?
I didn't read much into the problem..(Was tired.)

I later realized the OP wanted the analog version of a pocket
calculator not an oscillator.

Speaking of...
Can't recall who..somebody posted using multipliers..
Considering the Taylor series:
sin(x) = x - (x^3)/3! + (x^5)/5! - (x^7)/7! + ...

Taps off a chain of multipliers???

x-----+----------+--------+-------+---------+
| | | | |
x >multi1--->multi2--->mulit3---multi4---multi5 ..and so on
| | |
| -9.5dB -15dB
| | |
+--------> sum/sub amp <--------+
(mixer)
|
Sin(x)

Perhaps using a bunch of 4 quadrant multiplier chips.
Ex.
http://www.analog.com/UploadedFiles/Data_Sheets/66167428AD734_c.pdf

I'm not saying this will work...Just making ideas..

D from BC
British Columbia
Canada.

Goofed again.....forgot the factorial.
attenuate multi2 by -15.6dB
attenuate multi4 by -41.6dB

No matter...the whole idea still sucks and a uC solution is neater.


D from BC
British Columbia
Canada.

 

[Rich Grise]

....
You can filter my posts if you don't like'm..

I routinely filter the obnoxious losers who have nothing to contribute
but foul language.

Good Luck!
Rich

 

[D from BC]

I routinely filter the obnoxious losers who have nothing to contribute
but foul language.

Good Luck!
Rich

I've only been flamed about 3 times on here in the past year.
It's just minor and I don't do any filtering.
Also, it takes time to come up with a good counter flame.
It's gotta be rude but funny, clever and creative at the same time.

I give the 'funky Canadian' post a * out of ***** in flame quality


D from BC
British Columbia
Canada.

 

[Stephan Goldstein]

I found a data sheet at http://www.analog.com/UploadedFiles/Obsolete_Data_Sheets/55889558331308887AD639.pdf
. That's EXACTLY what I need.
Darn, it's discontinued!

Sorry to be a little late to the game, but if you really really really
need this, here's how you could build your own:

US Patent 4475169
US Patent 4476538

The first is on the basic sine core itself, the second covers more of
the AD639 functionality.

I have PDFs of these if you need them.

Steve

[To reply by email, please remove the three-letter food item
from my posting address]