Sine and square wave function generator

[Bricolo]

How can I build this easilly?

 

[Netlist]

How can I build this easilly?

http://www.elecdesign.com/magazine/2000/apr0300/ifd/2IFD.pdf
http://members.shaw.ca/roma/thirteen.html

Looks like those must be very easy to build; specially the second one looks extremely simple, but is limited to 10Khz.

/Hugo – Has an old tube HF generator- to trim old radios

 

[Christer]

http://sound.westhost.com/project22.htm

 

[Sch3mat1c]

Here ya go

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

 

[Bricolo]

nothing easier?

 

[Christer]

If you don't require low-distorsion sine waves there are several
function generator ICs, eg. MAX038, XR2206 and ICL8038. They
all seem to require just a few external passive components.

 

[JDeV]

Want easy?
You got PC, soundcard? Get free software , http://www.softpile.com/Multimedia/Audio/Review_10205_index.html ,for example, now u got signal generator

 

[Bricolo]

If you don't require low-distorsion sine waves there are several
function generator ICs, eg. MAX038, XR2206 and ICL8038. They
all seem to require just a few external passive components.

that's exacty what I was looking for

but what is low-distortion? 0.1%, 1%, more?

 

[Christer]

I haven't looked at the datasheets, but according to tech. data
in a catalouge the ICL has max 1% distorsion for sine wave.
I think the others are better, but you have to check the
datasheets.

 

[Jeff R]

I used the 8038 years ago and it works decently, but it hardly hi fi. In fact, the way it generates a sine wave is via nonlinear wave shaping using diodes in an op amp circuit. For checking frequency response it works ok, but it is not a true sine wave generator.

 

[analog_sa]

A relatively simple way to generate any waveform is by using a microcontroller, a look-up table or algorithm and a DAC. For a 90S8515 + absolute minimum of external components the code is really simple. You can easily get around 0.01% thd. Not to mention a whole new hobby I am sure there are more elegant DSP based solutions as well.


regards

peter

 

[peranders]

that's exacty what I was looking for

but what is low-distortion? 0.1%, 1%, more?

Don't expect better than 2%, maybe 1%. The sinus wave is triangle wave which is fixed in a unlinear circuit.

 

[sam9]

Ultra low distortion sine wave designs

Check out the oscillators described in these two aplication notes.


http://www.linear.com/pdf/lt1122.pdf

http://www.linear.com/pdf/lt1115fa.pdf

 

[jackinnj]

do a google search under "Walsh Series" for the mathematics. Don Lancaster also has an article on this at www.tinaja.com

A relatively simple way to generate any waveform is by using a microcontroller, a look-up table or algorithm and a DAC. For a 90S8515 + absolute minimum of external components the code is really simple. You can easily get around 0.01% thd. Not to mention a whole new hobby I am sure there are more elegant DSP based solutions as well.


regards

peter

 

[Rob M]

I just built one of these . It's probably okay for some purposes but I wouldn't call it "low distortion".