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 Forum index » DIY Hardware and Software
Triangle out of cd40106
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kaputtpanzer



Joined: Nov 02, 2009
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PostPosted: Tue Jan 19, 2010 3:13 pm    Post subject: Triangle out of cd40106 Reply with quote  Mark this post and the followings unread

Hey i tried to get a trianglewave out of the cd40106, i built it like this on my breadboard: http://www.elecfree.com/electronic/wp-content/uploads/2009/09/triangle-and-squarewave-generator-by-ic-40106.jpg

The output signal is very low, I tried to amplifie it with a tl072. Now it`s loud enough, but this is a very complicated way. And the signal is not so clean, it is something between a triangle and a squarewave!

What is the easiest way to get a strong and clean triangle out of a 40106???

Last edited by kaputtpanzer on Tue Jan 19, 2010 6:11 pm; edited 1 time in total
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frijitz



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PostPosted: Tue Jan 19, 2010 5:36 pm    Post subject: Re: Triangle out of cd40106 Reply with quote  Mark this post and the followings unread

Error 404 - Not Found
Sorry highly. Page you want to see. Changes.
Please find the new.
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kaputtpanzer



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PostPosted: Tue Jan 19, 2010 6:12 pm    Post subject: Reply with quote  Mark this post and the followings unread

Oh sorry now the link works!
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synthmonger



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PostPosted: Wed Jan 20, 2010 3:06 pm    Post subject: Reply with quote  Mark this post and the followings unread

This works great:
http://www.cgs.synth.net/modules/cgs21_super_psycho.html

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kaputtpanzer



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PostPosted: Wed Jan 20, 2010 4:52 pm    Post subject: Reply with quote  Mark this post and the followings unread

Ahh ok thank you. But I don`t want to use bipolar power supply.
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synthmonger



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PostPosted: Wed Jan 20, 2010 6:21 pm    Post subject: Reply with quote  Mark this post and the followings unread

Use a virtual ground then. Wiki or google it for all the info you need on it if you don't know what it is.
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ezekiel



Joined: Oct 17, 2009
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PostPosted: Fri Jan 22, 2010 7:35 pm    Post subject: Reply with quote  Mark this post and the followings unread

Or use an LM324 for single-sided supply.

The triangle wave pulled from the CMOS inverter oscillator is going to be coming out both weak and out-of-shape. The op amp is needed as a buffer and possibly an amplifier before feeding that triangle into the subsequent circuit.

I guess what you are saying is that if you need an op amp, you may as well not use the 40106 and just use a dual or quad op amp for an official, sharp triangle oscillator.
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synthmonger



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PostPosted: Fri Jan 22, 2010 7:42 pm    Post subject: Reply with quote  Mark this post and the followings unread

The Buffer and amplifier help correct it's symmetry and amplitude. Granted, it's not a perfect triangle but it's pretty close. Of course it would be easier to just look up a dual op-amp LFO schematic. Less parts too.
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kaputtpanzer



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PostPosted: Thu Jan 28, 2010 10:34 am    Post subject: Reply with quote  Mark this post and the followings unread

hmmm ok.
maybe this will work without bipolar power supply???

http://www.elecfree.com/electronic/wp-content/uploads/2007/07/ckt17_1.gif
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ezekiel



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PostPosted: Sat Jan 30, 2010 1:38 pm    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
maybe this will work without bipolar power supply???


Well, I just tried it with LM324 and 9V/0V supply and got an oscillation but too low level to confirm its waveshape on my lowtech mixer/PC.

Then, I attached the two ground points to 4.5V. Output was stronger, but still quite low level, but now clearly ramp/sawtooth.

I put a 300k pot in place of the 120k resistor and got a roughly 50 Hz to 200 Hz range. I think this circuit needs some beefing up for usefulness in synths.
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hexagon5un



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PostPosted: Wed Feb 03, 2010 10:18 am    Post subject: Reply with quote  Mark this post and the followings unread

The triangle wave out of a 40106 or similar oscillator ends up bouncing back and forth between 1/3 VCC and 2/3 VCC, so yeah the signal needs about 3x gain to swing full-range. If you're going into a dual-supply op-amp that shares ground with your 40106, you'll want to pass it through a capacitor to pull off the 1/2 VCC offset.

One quick-and-dirty trick is to use an unbuffered inverter (4069UB for 9v, 74hc04U for 5v -- the "U" is crucial) as an amplifier -- it ends up giving just about the right amplification with a little clipping distortion that I kinda like. It ends up like a sine-waveshaped triangle. You still end up with a positive (single-supply) signal, but it's rail to rail.

Try that out if you've got the parts around.
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kaputtpanzer



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PostPosted: Fri Feb 05, 2010 9:23 am    Post subject: Reply with quote  Mark this post and the followings unread

Hey thanks i think i order some 4069s and try it. if i get a good result i think i will draw a basic schematic, just for newbies like me.
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kaputtpanzer



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PostPosted: Tue Feb 16, 2010 1:05 pm    Post subject: Reply with quote  Mark this post and the followings unread

http://www.talkingelectronics.com.au/ChipDataEbook-1d/html/images/4069-fig2a.gif

Is this a good way to amplify the signal?
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kaputtpanzer



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PostPosted: Mon Mar 01, 2010 4:23 pm    Post subject: Reply with quote  Mark this post and the followings unread

hexagon5un wrote:
The triangle wave out of a 40106 or similar oscillator ends up bouncing back and forth between 1/3 VCC and 2/3 VCC, so yeah the signal needs about 3x gain to swing full-range. If you're going into a dual-supply op-amp that shares ground with your 40106, you'll want to pass it through a capacitor to pull off the 1/2 VCC offset.

One quick-and-dirty trick is to use an unbuffered inverter (4069UB for 9v, 74hc04U for 5v -- the "U" is crucial) as an amplifier -- it ends up giving just about the right amplification with a little clipping distortion that I kinda like. It ends up like a sine-waveshaped triangle. You still end up with a positive (single-supply) signal, but it's rail to rail.

Try that out if you've got the parts around.


I've tried it, but i don't get a good result. when I amplifie the signal with the 4069ube the output is a squarewave. do you have a schematic?
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