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 Author Topic: can some one provide a precision triangular wave generator circuit?  (Read 1877 times) 0 Members and 1 Guest are viewing this topic.
DreamCat
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 « on: June 03, 2010, 05:28:19 05:28 »

I want to make a capacitor meter, need a precision triangular wave.

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May be I expressed the wrong meaning, sorry for my bad english. Please correct it for me if you can.
hate
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 « Reply #1 on: June 03, 2010, 09:11:59 09:11 »

Here is 1! If u need explanation look for 'saw tooth generator' on the link below:

http://www.cappels.org/dproj/functsweep/functionswp.html

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DreamCat
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 « Reply #2 on: June 03, 2010, 10:58:00 10:58 »

Here is 1! If u need explanation look for 'saw tooth generator' on the link below:

http://www.cappels.org/dproj/functsweep/functionswp.html

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It seems the R15,diode and  R16 decide time of high and low logic
I'm thinking how to use single power supply op amp.
a 9V battery I will use, and divide into +4.5 and -4.5v.
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May be I expressed the wrong meaning, sorry for my bad english. Please correct it for me if you can.
hate
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 « Reply #3 on: June 03, 2010, 12:05:06 12:05 »

I guess u wanted to say R17 instead of R16 as I can't figure out where R16 is. I forget to mention that this circuit is for sawtooth really but u can modify it for triangle by just adding a diode in series with R17 reverse biased regarding the 1 in series with R15. So u can control the rise and fall times separately and if u make R15 and R17 equal u'll get a triangle wave. For a single supply operation, as though I haven't tried, the output should swing between 0V and 9V instead of -5V and 5V but not sure really!

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solutions
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 « Reply #4 on: June 03, 2010, 10:49:38 22:49 »

Can't you just use a programmable constant current source, then simply measure voltage at a particular time?

Q=CV

C=Q/V

Q=IT

C=IT/V
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Malcolm
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 « Reply #5 on: June 04, 2010, 04:20:38 04:20 »

Some assorted Funcion Generator--Schematics
Help
http://rapidshare.com/files/395114889/Assorted_Function_Generators--Schematics.rar.html
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zawmintun1
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 « Reply #6 on: June 05, 2010, 11:16:07 23:16 »

Hi Malcolm & All
http://rapidshare.com/files/395114889/Assorted_Function_Generators--Schematics.rar.html
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Malcolm
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 « Reply #7 on: June 06, 2010, 04:32:48 04:32 »

Some Assorted Function Generators-Schematics

http://depositfiles.com/files/hb45cslnd
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