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kivdenn
Nobel Prize Winner

Uganda
535 Posts
Posted - Dec 30 2009 :  04:28:06 AM  Show Profile  Reply with Quote
I used TL082 to make the triangle wave generator circuit instead of the LM555 and the TL081 in place of CA3140 which is responsible for varying the out put wave form so as to stablise the output voltage.

Now Guru why do you think made my wave behave like that, because you assured me that Chemelc's circuit can play the trick of generating a good triangle wave? Thanks
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pebe
Nobel Prize Winner

United Kingdom
1078 Posts
Posted - Dec 30 2009 :  04:42:27 AM  Show Profile  Reply with Quote
You cannot use a TL082 in place of a LM555. If you are using a single op-amp to generate your waveform then you must be using some other circuit to those shown.

Why don't you give the complete circuit instead of vaguely describing it?
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kivdenn
Nobel Prize Winner

Uganda
535 Posts
Posted - Dec 30 2009 :  09:15:09 AM  Show Profile  Reply with Quote
Here is the triangle wave generating circuit by Chemelec which I used in place of LMC555. It is not a single op amp its a dual op amp, have a look at its datasheet http://www.datasheetcatalog.org/datasheet/SGSThomsonMicroelectronics/mXuxuyv.pdf

Download Attachment: Oscillator-a.png
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audioguru
Nobel Prize Winner

Canada
4218 Posts
Posted - Dec 30 2009 :  10:20:39 AM  Show Profile  Reply with Quote
Kivdenn,
You said that Chemelec's triangle wave generator works perfectly and showed its output. It is the same circuit as all your other triangle wave generator circuits.
At the CD4017 you used capacitors that are 10nF (103) instead of 2.2nF (222)so no wonder your circuit does not work properly.
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kivdenn
Nobel Prize Winner

Uganda
535 Posts
Posted - Dec 31 2009 :  04:25:59 AM  Show Profile  Reply with Quote
When I changed these caps to 2.2nf, there was no output at all at the output pins of Cd4017. What could be the cause? Thanks
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pebe
Nobel Prize Winner

United Kingdom
1078 Posts
Posted - Dec 31 2009 :  04:51:47 AM  Show Profile  Reply with Quote
Looking at your 'Output at pins 2 and 7 of CD4017.jpg' picture in your earlier posting, the 4017 was not operating correctly then. There should be alternate pulses on pins 2 and 7.
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