Function generator refined. Now as close to 1k hz as I can get it - copy

284

04:18:05

Green-----square
Red-------triangle
Blue------ sine

Give it a shake to get it going. It will need a few second to stabilize. 

This time I used a different methods method for producing the sine wave. This is an application of the method that @hurz published a few months back.

published 12 years ago

hamilton1300

12 years ago

So sorry about the miss spelling @hurz :-(

rbrtkurtz

12 years ago

You can change it...

hurz

12 years ago

paranoia?

faceblast

12 years ago

everybody's heard that the hurz is the word

hamilton1300

12 years ago

Nice!!!!

thebugger

12 years ago

Not really a sinewave though. And this way its absolute maximum amplitude is no more than 700mv. If its not frequency adjustable just add a few RC filters or an LC filtrer for the specific frequency.

hurz

12 years ago

And don't forget a low noise BC550

faceblast

12 years ago

put a 10mH coil and 2.53uF cap on the end

dkobe

12 years ago

This is a nice ckt. Faceblast has the right idea. I removed the 2 diodes and replaced them with a 1uf cap in parallel with a 50mH inductor. Of course we will create a little phase shift, but what's a little phase shift among friends.

thebugger

12 years ago

Yeah but remember this LC filter is for a specific frequency only. It wont work for other frequencies.

hamilton1300

12 years ago

I suppose you could use a multi level rotary switch to change the freq and filter at the same time. Kinda like the ones you find in an old O-scope

Majorzeros

11 years ago

Im sorry but its not working, no power and oscillation.

MrAureliusR

11 years ago

Majorzeros: you need to physically shake your device to start it. Assuming your device has an accelerometer, the app injects noise whenever it detects shakes. Interesting feature of this app, for sure!

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