XR8038 to make function generator - Electronic Circuits Projects Diagrams Free

Striker · 24th October 2003, 04:50 PM

Hi Guys,

I am impressed to see such a wonderful forum dedicated to the facilitating world of electronics. Hats of to the host and you guys who give advice and share ideas/information. I would like to build a function generator using XR8038 chip. Can anyone send or tell me where I can find a circuit diagram for this please?

Your help will be appreciated.

Many thanks,

Striker.

Optikon · 24th October 2003, 05:43 PM

Hmmm... German company Exar is?

I found the datasheet for it here:

http://www.electronic-engineering.ch...ets/xr8038.pdf

It looks pretty straight forward. Only a couple of external resistors are needed for adjustments.

Why don't you create a design using the datasheet as a reference and then post your schematic. We can help spot problems / improvements.

Try it!

It might just work first time (since the part does all the hard work of generating the waveforms!)

:wink:

Striker · 24th October 2003, 08:28 PM

Hi Optikon,

Thanks so much for the reply and link, it helped. I also did some research and found another link from a different manufacturer for the 8038 called the ICL8038 http://www.iweil.com/devices/generators/icl8038.pdf
These guys have a few nice little circuit diagrams, one of which I am building.

Thanks so much again,

Striker.

ezwizzard · 25th October 2003, 01:07 AM

HI, you may want to try http://www.discovercircuits.com this site has over 7000 circuits, you may find what you want there.. :roll:

Striker · 25th October 2003, 02:33 AM

Hi Ezwizzard,

Many thanks for the link, it's riceless.

Thanks again,

Striker.

nics · 11th November 2003, 04:06 PM

Hi there,

I have used a schematic that I got from the following site:
http://www.mitedu.freeserve.co.uk/Ci...ar/funcgen.htm

It looks like it is working OK but I do get a lot of distortion and harmonics

. I think this is from the transformer that delivers the 6-0-6 Volt power to the circuit. The transformer is also inside the metal case that I used.

Any suggestions to minimise the harmonics?

Sebi · 11th November 2003, 04:57 PM

Try to find Exar appnote TAN005 (i have) it contains a complete scheme.Also recommend for consideration MAX038 d'sheet: it is enhanced version from Maxim-Dallas and working up to 20MHz! (the ICL and XR go very hard up to 1MHz.)

nics · 12th November 2003, 05:20 AM

Thanks I will have a look at the appnote. But what I did find was that it was indeed a 50 hz harmonic plaging me. Would it be because the circuit was designed in another country and the caps used for leveling the AC voltage may not be correct for South Africa? Our power network must obviously be 50 Hz, otherwise where does this come from :?: I did turn the back of the metal box around to make sure that it does not directly come from the transformer.

But there was no improvement!!

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24th October 2003, 04:50 PM	(permalink)
Striker	XR8038 to make function generator Hi Guys, I am impressed to see such a wonderful forum dedicated to the facilitating world of electronics. Hats of to the host and you guys who give advice and share ideas/information. I would like to build a function generator using XR8038 chip. Can anyone send or tell me where I can find a circuit diagram for this please? Your help will be appreciated. Many thanks, Striker.

24th October 2003, 05:43 PM	(permalink)
Optikon	Hmmm... German company Exar is? I found the datasheet for it here: http://www.electronic-engineering.ch...ets/xr8038.pdf It looks pretty straight forward. Only a couple of external resistors are needed for adjustments. Why don't you create a design using the datasheet as a reference and then post your schematic. We can help spot problems / improvements. Try it! It might just work first time (since the part does all the hard work of generating the waveforms!) :wink:

24th October 2003, 08:28 PM	(permalink)
Striker	Hi Optikon, Thanks so much for the reply and link, it helped. I also did some research and found another link from a different manufacturer for the 8038 called the ICL8038 http://www.iweil.com/devices/generators/icl8038.pdf These guys have a few nice little circuit diagrams, one of which I am building. Thanks so much again, Striker.

25th October 2003, 01:07 AM	(permalink)
ezwizzard	HI, you may want to try http://www.discovercircuits.com this site has over 7000 circuits, you may find what you want there.. :roll:

25th October 2003, 02:33 AM	(permalink)
Striker	Hi Ezwizzard, Many thanks for the link, it's riceless. Thanks again, Striker.

11th November 2003, 04:06 PM	(permalink)
nics	Hi there, I have used a schematic that I got from the following site: http://www.mitedu.freeserve.co.uk/Ci...ar/funcgen.htm It looks like it is working OK but I do get a lot of distortion and harmonics . I think this is from the transformer that delivers the 6-0-6 Volt power to the circuit. The transformer is also inside the metal case that I used. Any suggestions to minimise the harmonics?

11th November 2003, 04:57 PM	(permalink)
Sebi	Try to find Exar appnote TAN005 (i have) it contains a complete scheme.Also recommend for consideration MAX038 d'sheet: it is enhanced version from Maxim-Dallas and working up to 20MHz! (the ICL and XR go very hard up to 1MHz.)

12th November 2003, 05:20 AM	(permalink)
nics	Thanks I will have a look at the appnote. But what I did find was that it was indeed a 50 hz harmonic plaging me. Would it be because the circuit was designed in another country and the caps used for leveling the AC voltage may not be correct for South Africa? Our power network must obviously be 50 Hz, otherwise where does this come from :?: I did turn the back of the metal box around to make sure that it does not directly come from the transformer. But there was no improvement!!