Discrete triangle generator
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diyAudio Member

Join Date: Sep 2004
Location: Kaspar Sinding Meyer @ DTU in Lyngby
Discrete triangle generator

Hi

I've made a simple discrete triangle generator if any of you are interested.

With the current values it's osscilating at 1kHz. Decresing C2 will increese the frequency.

The schematic:

A simulaion:

I've attached the Orcad 10.3 project files.
Enjoy

Best regards
Kaspar Sinding Meyer
Attached Files
 triangle.zip (56.8 KB, 222 views)

 25th May 2005, 06:30 AM #2 Pierre   Banned   Join Date: Nov 2004 Location: Paris Interesting... Have you tried to put it to oscillate at about 250-400KHz? How does the triangle look like? Best regards, Pierre
 25th May 2005, 11:46 AM #3 sovadk   diyAudio Member     Join Date: Sep 2004 Location: Kaspar Sinding Meyer @ DTU in Lyngby Good question. I have tryed that, The triangle wave gets a little bit idstorted in the bottom @ 400kHz, but else it looks fine. However I think that can be solved.
 25th May 2005, 12:37 PM #4 sovadk   diyAudio Member     Join Date: Sep 2004 Location: Kaspar Sinding Meyer @ DTU in Lyngby Okey heres what you'll have to do to make it work @ 500kHz . Change R7 to 1.5k, R2 to 2.2k and C2 to 330p. To improve linearity decreese C7 to 47p. This is my simulation results: One way to evaluate the linearity of the triangle wave is to look at it's derivative. One should expect a pure square wave. This is my results:
 25th May 2005, 02:55 PM #5 Pierre   Banned   Join Date: Nov 2004 Location: Paris I must admit that's very good. Have you used it in a Class-D amplifier?
 25th May 2005, 03:01 PM #6 sovadk   diyAudio Member     Join Date: Sep 2004 Location: Kaspar Sinding Meyer @ DTU in Lyngby No I haven't yet used it, since I designed it yesterday. Right now I'm using a solution with one comperator and a couple of BJTs. I've posted the design here: http://www.diyaudio.com/forums/showt...threadid=54263

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