Dear Respected atferrari,

Thank you very much for your kind reply. I had reviewed and designed the circuits in LTspice tool, referred by you in above mention post. in that ckt you used TL072, but i replace this IC with LF353, coz it's replacement each other. but unfortunately didn't found good results what i need. I think the values of RC not suitable selected by me. if you help me in this regards then i shall be highly grateful to you for this act of kindness. (If you need Schematic of the ckt i can provide you)


Regards
Nomi

Please post the .asc file.

 

Here's a modification of the integrator section of your triangle generator, to improve the triangle shape.
The time constant R1C1 needs to be selected according to the input square-wave frequency. Too high a value and the triangle will have too small an amplitude: too low and the triangle output will clip. The values shown should suit a 170Hz input.
R4/C2 are a simple integrator which provides feedback to keep the triangle centred on the voltage at the non-inverting input of the op-amp, rather than drifting up or down as a result of asymmetry of the op-amp output. The time constant R4C2 is chosen to be at least ten times R1C1.

 

Thank you very much dear respected Alec_t for your kind help and circuit seems looks very good. I have tried to redraw this cct at my end but it not works well, results are stable after apx 45ms ( 9 cycles of Triangular waveform) and i have square wave of 5Vp-p and need at output 5Vp-p.



Regards
Nomi

 

Here's a modification of the integrator section of your triangle generator, to improve the triangle shape.
The time constant R1C1 needs to be selected according to the input square-wave frequency. Too high a value and the triangle will have too small an amplitude: too low and the triangle output will clip. The values shown should suit a 170Hz input.
R4/C2 are a simple integrator which provides feedback to keep the triangle centred on the voltage at the non-inverting input of the op-amp, rather than drifting up or down as a result of asymmetry of the op-amp output. The time constant R4C2 is chosen to be at least ten times R1C1.
View attachment 200035

Is V1 pulsed?
And in a square signal?

Confused to say the least.

 

Is V1 pulsed?

No. It's a fixed 9V

And in a square signal?

'Square' is the name of the square-wave pulse source.

 

but it not works well

My sim used a 9V supply. Depending on the op-amp used, with a 5V supply you may need to change the R1C1 time constant to avoid the triangle clipping. But no real-world op-amp integrator will give you a 5V peak-to-peak triangle wave when the supply voltage is only 5V.

 

No. It's a fixed 9V

'Square' is the name of the square-wave pulse source.

Way too evident now. Sorry.

 

since the op amp shoulders (of it's output stage) are not balanced (unlike for https://www.ti.com/lit/ds/symlink/tl3472.pdf) the rising falling slope may need adjustment

also the integrator's output is better to be kept at low amplitude and amplified with additional buffer ← it enables for the comparator and for the integrator to have their input voltages near the "Zero" or the "supply Median" that usually is best sensed range for the Common mode input -- thus enabling the best frequency response . . .

 

try this one: an old time but simple: XR2206 or ICL8038, both are simple and easy to apply!
https://www.ebay.com/itm/XR2206-Fun...hash=item364eb75c69:m:mEKPBT9NPJ-MSYVkDhibgqA
https://www.ebay.com/itm/ICL8038-Fu...211721?hash=item4b44c38609:g:bZUAAOSw401aG9X5

 

Please post the .asc file.

@Nomi 1114

Will you?

 

Dear Respected @atferrari

Sorry for late reply, actually i was out of station and didn't used my laptop. so i extremely really sorry for late post.
Attached please find the .asc file of the desired integrator circuit in which i need a pure triangular wave form holding magnitude of 5V (or near about) and i found initially 3 cycles are not good , unable to understand why?
Please help me in this regards, i shall be highly grateful to you for this act of kindness.

Forwarded for your kind information and further necessary action at your end please.

Regards
Nomi

 

i found initially 3 cycles are not good , unable to understand why?

Because capacitors take a finite time to charge up to a target voltage from an initially discharged state.

 

Because capacitors take a finite time to charge up to a target voltage from an initially discharged state.

Dear Respected Alec_t,

So any good solution in this situation, or any improved cct you have ??

 

any improved cct you have ?

Sorry, no.

 

? some changes (a non fast startup auto-centering version)

 

Unfortunately the post #35 circuit has the same start-up issue as my post #22 circuit.
If the TS really insists on a perfect uniform triangle wave right from the word 'go', then I think the only way would be to have a triangle generator running permanently and then (synchronously?) gate its output on 'go'.
I'm curious as to what this perfect 5V 170Hz triangle wave will be used for? Seems a lot of complication for no apparent reason.

 

the "0" start delay is achieved by CC source sink and the "grounding" of the capacitor to the supply median -- makes a circuit a "bit" more complex

 

Nice! Now all you have to do is tweak the components to get 170Hz instead of the present 626Hz .

 

tweak the components

Yes , You need to match the MOS-Fet pairs for each of the current mirror shoulders (or adjust Hi/Low ones with extra series source-resistors )
. . . the j-Fet requires a voltage drop of ≥4V for 5 volt supply this is not doable 5 - 1.6 -1.6 V = 1.8V for constant current source has likely to be done with additional op amp + yet additional matched feedback MOS-Fet . . . there might be more to this (getting the real circuit to perform the same)

 

Dear All,

Hope you all are doing well with good health. Here i would like to ask one important question, that i have designed Triangle wave (170Hz) generator's circuit by using xtal osc, it wroks well. i have also designed separately 7.7MHz to 8.7MHz frequency oscillator (Square wave) by using a input/source signal of 170Hz (triangular waveform). For designing and simulation purpose i used LTspice tool.
But when i connected these two modules then i am unable to get output waveform, my system becomes too busy and makes too noisy. if someone can help me in this regards then i shall be highly grateful to him/her, I can provide my schematics.

Anxiously waiting for your kind and quick response please.

Regards