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 Forum index » DIY Hardware and Software » Circuit Bending
Triangle wave amplitude
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samsam



Joined: Mar 01, 2017
Posts: 22
Location: France

PostPosted: Sun Apr 09, 2017 7:25 am    Post subject: Triangle wave amplitude Reply with quote  Mark this post and the followings unread

Hi everyone.

I'm currently working on very simple audio oscillator made from a CD40106 chip.

I have found a circuit that transform the square wave into a triangle wave, wich is great. (apparently it is not a real triangle)

I would like to add a switch to it so i could choose between the square and the triangle wave.

the problem is that my triangle is much quieter than my square wave and i would like them to match in amplitude.

Do you guys have any idea of a very simple circuit that could do the trick ?

I have tried a circuit with a transistor, but then my triangle wave is not as smooth as it was.

Thanks for the help.
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Grumble



Joined: Nov 23, 2015
Posts: 721
Location: Netherlands
Audio files: 21

PostPosted: Sun Apr 09, 2017 9:20 am    Post subject: Reply with quote  Mark this post and the followings unread

Did you measure the amplitude of the square and the triangle wave or just listened?
I'm asking because the square will sound much LOUDER than a tri or sine wave (up to a certain frequency).
An easy way is to use just two resistors in the right ratio to lower the square amplitude until you match the triangle wave.
see: http://sim.okawa-denshi.jp/en/teikokeisan.htm
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samsam



Joined: Mar 01, 2017
Posts: 22
Location: France

PostPosted: Sun Apr 09, 2017 10:56 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi Grumble. Thanks for the reply

I was also starting to think that i could lower the square wave to match triangle.
I Have put a potentiometer on the square wave to lower it. i will take a look a the link you provided to see how i can replace the pot with two resistor.

No i didn t measure the amplitude, i m just listening.

Thank you.
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Grumble



Joined: Nov 23, 2015
Posts: 721
Location: Netherlands
Audio files: 21

PostPosted: Sun Apr 09, 2017 11:39 am    Post subject: Reply with quote  Mark this post and the followings unread

https://www.youtube.com/watch?v=uIuJTWS2uvY
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samsam



Joined: Mar 01, 2017
Posts: 22
Location: France

PostPosted: Sun Apr 09, 2017 12:38 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thank you. Very interresting and very logical.
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