analog circuit to compute sine of voltage

Robert · 2008-02-23T05:56:35+00:00

Hello -- Can anyone tell me how to make an analog circuit that takesin a signed voltage v and produces a voltagea * sin (b * v), where a and b are constants. It doesn't matter to mewhat a and b are, since I can always scale the input/output voltagesappropriately.The application is to drive a large D.C. motor, where the argument tothe sin function is given by a potentiometer connected to the shaft,in such a way that the motor simulates a swinging pendulum. However,even a low-power circuit involving op-amps, say, would be okay, sinceI could always feed the output into some large power transistors etc.Thanks, Robert

Feb 23, 2008 43 Replies

Rate this thread:

Rich Grise 18 years ago

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

Good Luck! Rich

Vote

D from BC 18 years ago

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 :P

D from BC British Columbia Canada.

Vote

Stephan Goldstein 18 years ago

formatting link

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]

Vote

Jim Thompson 18 years ago

formatting link

Yep, just whip up a breadboard ;-)

...Jim Thompson

Vote

Join the Discussion

Have something to add? Share your thoughts — no account required.

Didn't find your answer?

Ask the community — no account required