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audioguru
Nobel Prize Winner
Canada
4218 Posts |
 Posted - Sep 25 2009 : 11:53:40 AM
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The 555 is made by about 12 semiconductor manufacturers.
National Semi names theirs an LM555.
Texas Instruments names theirs a TL555.
Philips and many other manufacturers name theirs an NE555.
An LMC555, TLC555 and ICM7555 are low power Cmos and are different.
There are many other circuits that will generate a triangle waveform.
Since you cannot get ordinary common parts then maybe you should do gardening instead of electronics. |
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kivdenn
Nobel Prize Winner
Uganda
535 Posts |
Posted - Sep 26 2009 : 04:34:35 AM
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| Just thank God for puting you in that part of the world and stop making us feel coursed for being in these parts of the world. Any way just help me and give me any circuit that can produce a triangular wave without using a timer IC. Thanks and may God continue blessing you. |
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pebe
Nobel Prize Winner
United Kingdom
1078 Posts |
Posted - Sep 26 2009 : 05:22:43 AM
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I just went to Google and looked for 'op amp triangular wave generator'. I found plenty.
Why can't you do the same? |
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audioguru
Nobel Prize Winner
Canada
4218 Posts |
Posted - Sep 26 2009 : 3:14:32 PM
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My parents put me in Canada where everything is available. God didn't.
Everything is also available in many other countries.
God does not bless me. My wife, son and daughter do.
People in Africa are cursed, not coursed.
Which of the many gods is yours? |
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kivdenn
Nobel Prize Winner
Uganda
535 Posts |
Posted - Sep 28 2009 : 10:51:23 AM
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Audioguru realy if this is the price i have to pay for you to help me its too much and I cant handle. So please keep quite instead of insulting me and Africans at large. For your information at this time and age no body in Africa believes in gods but rather God the Almighty in heaven. It is evwen ashaming to see a person from such a civilised state to think that it the the wife and children who give him blessings. If they do, good for you but I wont take take your advise.
Mr. Pebe let me try to search and i will consult you on any that I come across thanks for the good manners. |
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kivdenn
Nobel Prize Winner
Uganda
535 Posts |
Posted - Sep 29 2009 : 11:23:47 AM
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Hullo Mr. Pebe I have got this sawtooh oscilator can it work in place of the LMC555 circuit? What does output 2 mean and what does it connect to in our inverter circuit? Thanks
Dennis
Download Attachment:  Sawtooth oscilator.gif
3.74 KB
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pebe
Nobel Prize Winner
United Kingdom
1078 Posts |
Posted - Sep 29 2009 : 2:40:01 PM
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The sawtooth waveform is due to the different charge and discharge times of C1 through D1/R1 and D2/R2.
You could make it triangular by removing D1, D2, and R1, and adjusting the frequency with R2. |
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audioguru
Nobel Prize Winner
Canada
4218 Posts |
Posted - Sep 29 2009 : 6:17:52 PM
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I use the triangle-wave generator that Pebe discussed in my 3-colours fading Mood lights.
Each colour (red, green and blue LEDs) slowly brightens then slowly fades. Each colour has a slightly different frequency. The colours add and make millions of colours and brightnesses. |
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kivdenn
Nobel Prize Winner
Uganda
535 Posts |
Posted - Oct 01 2009 : 12:36:34 PM
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quote:
Originally posted by pebe
The sawtooth waveform is due to the different charge and discharge times of C1 through D1/R1 and D2/R2.
You could make it triangular by removing D1, D2, and R1, and adjusting the frequency with R2.
Thank you but is there adifference betwee sawtoth and triangular waves? Also what does output 2 mean and where does it connect? should I avoid it or not, if yes how do I do it. Another thing is that thas a frequency of 56.8Hz how do i change to 50hz.Tanks
Dennis
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Edited by - kivdenn on Oct 01 2009 12:58:33 PM |
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pebe
Nobel Prize Winner
United Kingdom
1078 Posts |
Posted - Oct 01 2009 : 2:46:02 PM
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A sawtooth waveform looks like the teeth of a saw, with different rise and fall times. With a triangular waveform, the form is symetrical with equal rise and fall times.
Output2 has nothing to do with the waveform generator and can be ignored.
Three postings back, I told you how to adjust the frequency. Check back on it! Earlier, when I asked you not to shout, you said you get annoyed having to ask the same question repeatedly. I feel just the same about having to answer the same question repeatedly! |
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kivdenn
Nobel Prize Winner
Uganda
535 Posts |
Posted - Oct 02 2009 : 11:29:30 AM
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| Ok I understand but my problem is the maths involved please help me try to figure out the resistor and capacitor combination that can produce 50Hz. Am sorry if its bothering but am dieing to make a satble outpu voltage inverter. Thanks |
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pebe
Nobel Prize Winner
United Kingdom
1078 Posts |
Posted - Oct 02 2009 : 12:24:59 PM
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Here is a circuit similar to the one you gave, and shows the calculations.
http://hobby_elec.piclist.com/e_ckt16.htm
You can see that with the values given you can expect a frequency of 1386Hz.
C1 is charged and discharged by the current through R1 in a linear manner. So if R1 is doubled in value the frequency go down by the same ratio.
So for a frequency of 50Hz, R1 needs to be changed to 2.2K x 1386/50 = 60.98K
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kivdenn
Nobel Prize Winner
Uganda
535 Posts |
Posted - Oct 19 2009 : 05:35:51 AM
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| Hi I have built the triangular wave oscilator circuit as its shown in your prevous link but it has failed to produce the oscilations. I have checked and cross checked the circuit but to no success. Is it possible that there were some errors in the circuit? Do you know of any other such circuit so that I try it? What if i replace the triangular wave oscilator with a square wave oscilator cant the output of the OPAMP still be a square wave? Am dieing to make a stable voltage MSW inverter. NOTE: I test oscilations by connecting a buzzer to the opamp output pin 1 and the ground because I dont have an osciloscopoe. Thanks Dennis |
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pebe
Nobel Prize Winner
United Kingdom
1078 Posts |
Posted - Oct 19 2009 : 06:22:37 AM
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If you are using a buzzer to check the output I'm not a bit surprised you don't get it to work!
If you are relying on stuff like that as test equipment, you don't stand a chance of building anything.
If you Google you will find that there is software availabble for free that will enable you to use your PC as a simple oscilloscope. Try that. |
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kivdenn
Nobel Prize Winner
Uganda
535 Posts |
Posted - Oct 19 2009 : 08:32:30 AM
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I have tried to check the original site of the circuit publisher and he writes that the circuit requires a dual power supply that can produce +12V and -12V. I guess this was the cause of failure because I have used a buzzer to test most of my oscilators such as square wave and MSW with success though it is a rudementary way of doing it. I dont know how to get this dual power supply from my 12V battey or even how to hook up my circuit on such a power circuit if I got one as it has three terminals +12V, 0V and -12V.
I have got this circuit using an LM741 http://pcbheaven.com/circuitpages/Triangle_Wave_Generator/ I dont know whether this also needs a dual power supply or not but in any way can it truely produce a triangular wave? Let me try to look for such a software. Thanks Dennis |
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HELP ME REOMOVE THE LVD CIRCUIT
