sinewave oscillator

Juergen Knoop · 26th July 2007, 11:39 AM

Hi,
I'm looking for a oscillator circuit with sinewave or triangle output constantly sweeping between app. 10-50Hz.
Is there anything ready or adoptable on the net?
regards
Jürgen

theAnonymous1 · 26th July 2007, 01:39 PM

Here are just a few things my friend google found.....

http://sharon.esrac.ele.tue.nl/mirro...oise-Pulse.htm
http://www.national.com/nationaledge/jun04/article.html
http://www.jbgizmo.com/page19.html
http://octopus.freeyellow.com/sine.html
http://www.aldinc.com/pdf/osc_42004.0.pdf
http://www.interq.or.jp/japan/se-inoue/e_ckt18.htm
http://www.redcircuits.com/Page13.htm
http://www.electronics-lab.com/proje...rs_timers/016/
http://www.ryanmcginty.com/orgone/freqgentutorial.htm

Juergen Knoop · 26th July 2007, 01:50 PM

thank you, but this is not what I'm looking for.
Probably I could use two NE555 together with some pulse shaping.
regards

theAnonymous1 · 26th July 2007, 01:59 PM

The very first one has a sweep function, but it's a complicated project.

If you only need a set sweep range, the absolutely easiest way I can think of would be to load a sound file of the sweep onto a cheap portable device like an mp3 player.

Is using a PC an option?

janneman · 26th July 2007, 02:01 PM

Maxim has a chip that does it. Look for Function Generator, I forgot the exact type number.

Edit: MAX038

Jan Didden

Juergen Knoop · 26th July 2007, 02:12 PM

aah sorry! Started with the second link.

Hm, PC and expensive circuitry is not an option. I wanted to build a cheap, simple interval circuit for synchronus motors. Maybe a good way to get in touch with microcontrollers. But that would take to much time.
Call it a sunday afternoon project.

regards

Conrad Hoffman · 26th July 2007, 02:43 PM

There are modern and better ways, but I'd just go to my junk bin and pull out an old 8038 or one of the Exar chips.

Juergen Knoop · 26th July 2007, 04:05 PM

won't cannibalise my function generator!

I will try it with some standard linear parts out of my parts bin.

phase_accurate · 26th July 2007, 04:19 PM

How nice does the sinusoid have to look like ?
There are methods to generate sinusoidal approximations using shift registers and resistors. The shift register can be clocked by the VCO part of a 4046 CMOS PLL IC.

Regards

Charles

jcx · 26th July 2007, 04:31 PM

starting from zero it might take a little more than a afternoon but you could probably progam this that quickly if you are familiar with uC dev environments:

http://focus.ti.com/docs/toolsw/fold...430-f2013.html

complete developement kit only US$20, spare uC boards US$10

example code "Using PWM Timer_B as a DAC":

http://focus.ti.com/lit/an/slaa116/slaa116.pdf

also cheap mp3 player could be dedicated to the task, easier if battery power ok, could add power thru usb port for cont operation, some older 256K/512K flash devices can be found for <US$30

26th July 2007, 11:39 AM	#1
Juergen Knoop diyAudio Member Join Date: Jan 2007 Blog Entries: 3	sinewave oscillator Hi, I'm looking for a oscillator circuit with sinewave or triangle output constantly sweeping between app. 10-50Hz. Is there anything ready or adoptable on the net? regards Jürgen

26th July 2007, 01:39 PM	#2
theAnonymous1 diyAudio Member Join Date: Feb 2004 Location: Anonymityville	Here are just a few things my friend google found..... http://sharon.esrac.ele.tue.nl/mirro...oise-Pulse.htm http://www.national.com/nationaledge/jun04/article.html http://www.jbgizmo.com/page19.html http://octopus.freeyellow.com/sine.html http://www.aldinc.com/pdf/osc_42004.0.pdf http://www.interq.or.jp/japan/se-inoue/e_ckt18.htm http://www.redcircuits.com/Page13.htm http://www.electronics-lab.com/proje...rs_timers/016/ http://www.ryanmcginty.com/orgone/freqgentutorial.htm __________________ "If you don't like funerals don't kick sand in ninja's face."

26th July 2007, 01:59 PM	#4
theAnonymous1 diyAudio Member Join Date: Feb 2004 Location: Anonymityville	The very first one has a sweep function, but it's a complicated project. If you only need a set sweep range, the absolutely easiest way I can think of would be to load a sound file of the sweep onto a cheap portable device like an mp3 player. Is using a PC an option? __________________ "If you don't like funerals don't kick sand in ninja's face."

26th July 2007, 02:01 PM	#5
janneman diyAudio Member Join Date: May 2002 Location: Where Germany, The Netherlands and Belgium meet Blog Entries: 6	Maxim has a chip that does it. Look for Function Generator, I forgot the exact type number. Edit: MAX038 Jan Didden __________________ /New Linear Audio publication: Baxandall & Self on Audio Power!

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26th July 2007, 01:50 PM	#3
Juergen Knoop diyAudio Member Join Date: Jan 2007 Blog Entries: 3	thank you, but this is not what I'm looking for. Probably I could use two NE555 together with some pulse shaping. regards

26th July 2007, 02:12 PM	#6
Juergen Knoop diyAudio Member Join Date: Jan 2007 Blog Entries: 3	aah sorry! Started with the second link. Hm, PC and expensive circuitry is not an option. I wanted to build a cheap, simple interval circuit for synchronus motors. Maybe a good way to get in touch with microcontrollers. But that would take to much time. Call it a sunday afternoon project. regards

26th July 2007, 02:43 PM	#7
Conrad Hoffman diyAudio Member Join Date: Mar 2007 Location: Canandaigua, NY USA	There are modern and better ways, but I'd just go to my junk bin and pull out an old 8038 or one of the Exar chips.

26th July 2007, 04:05 PM	#8
Juergen Knoop diyAudio Member Join Date: Jan 2007 Blog Entries: 3	won't cannibalise my function generator! I will try it with some standard linear parts out of my parts bin.

26th July 2007, 04:19 PM	#9
phase_accurate diyAudio Member Join Date: May 2002 Location: Switzerland	How nice does the sinusoid have to look like ? There are methods to generate sinusoidal approximations using shift registers and resistors. The shift register can be clocked by the VCO part of a 4046 CMOS PLL IC. Regards Charles

26th July 2007, 04:31 PM	#10
jcx diyAudio Member Join Date: Feb 2003 Location: ..	starting from zero it might take a little more than a afternoon but you could probably progam this that quickly if you are familiar with uC dev environments: http://focus.ti.com/docs/toolsw/fold...430-f2013.html complete developement kit only US$20, spare uC boards US$10 example code "Using PWM Timer_B as a DAC": http://focus.ti.com/lit/an/slaa116/slaa116.pdf also cheap mp3 player could be dedicated to the task, easier if battery power ok, could add power thru usb port for cont operation, some older 256K/512K flash devices can be found for <US$30

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