Function Generator

191

02:55:25

Put together from a number of schematics I'd been looking at to see how to do this. Got kinda confusing; think I'll stick to one scheme from know on. The op amps take up a lot of space, so I couldn't get it laid out very well on here, pretty confusing to look at. Wanted to add sawtooth, but ran out of space. Seems take a while for the sine to settle down and it looses amplitude at each stage. Any advise appreciated.

published 7 years ago

Robert_Kidd

7 years ago

In EC chips come with power connected. Highlight chip, click on spanner and you’ll see power rails for chip - which you can adjust if required.

gablick

7 years ago

Aha, thanks. I apparently needed give it just a little jolt to get it going! The button boss! Pot adjusts frequency.

Robert_Kidd

7 years ago

You can also get it going by injecting noise. Shake your phone and you’ll get a pop-up saying “injecting noise”. On a PC you would click and hold left mouse button and move mouse rapidly back and forth, then release.

ViolationMad

7 years ago

Im not really sure why you would have the output limited by 1k but use a 200 Ohm voltage divider as feedback for a ideally perfect infinite impedance on the non inverting input. I would recomend to make them something like 10k each to lower the power consumtion a bit. Also EC offers acutal potentiometers as parts so you dont need to use two resistors, you can just use a 20k pot.

gablick

7 years ago

O.K. I've run across the shake thing and didn't put two and two together. Thanks.

gablick

7 years ago

Thanks for the tip on the pot. I'd been trying to put one in, in between the two already there, which worked on the board; replacing them both with the pot gave me just what I was looking for. Perfect.

LeButch

7 years ago

The sine wafe kinda sucks...

gablick

7 years ago

It takes a long time for the sine to settle in. I'm sure in real time it's pretty instant, so I don't know if it's a real problem of not. I'm afraid I'm not knowledgeable enough to say.

Robert_Kidd

7 years ago

But you’re honest enough to admit that :-). Good man!

gablick

7 years ago

This is how I learn; the hard way - put it together, research, and try to figure out how it's doing what it's doing and if it's doing what it should be doing. Yes, as a matter of fact I do get a lot of headaches! :-)

gablick

7 years ago

Can't figure out why it's so slow for the sines to get going and stabilize, but once it gets going(2-3 minutes), it sure looks like I finally figured out how to amplify the signal? If nothing else, I'm sure starting to understand how someone could write a 900+ page book on op amps.

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