# Good-day all. Please I Urgently Need 100 kHz Functin Generator Circuit

#### nma

Joined Feb 1, 2016
15
Good-day all. Please I urgently need help with my project. I am working on a signal generator that can generate three wave forms: Square wave, triangular wave and sinewave. The maximum frequency is 100kHz. I used op-amp (TL072). The square is on coming out well.

#### alfacliff

Joined Dec 13, 2013
2,458
there are chips designed for that, look up MAX038, XR2206, and such.

#### Dodgydave

Joined Jun 22, 2012
10,948
Try making a Wien oscillator with your op amp,..

#### atferrari

Joined Jan 6, 2004
4,699
Good-day all. Please I urgently need help with my project. I am working on a signal generator that can generate three wave forms: Square wave, triangular wave and sinewave. The maximum frequency is 100kHz. I used op-amp (TL072). The square is on coming out well.
The help you require is going to cost you dearly because it will require previous adivination to know what circuit you did implement.

Just in case, providing a schematic, the cost is much much lower. Please reconsider.

Ah, if urgent, cost goes high again.

#### AnalogKid

Joined Aug 1, 2013
10,574
I think what AT is trying to say is - no schematic, no answers.

ak

#### OBW0549

Joined Mar 2, 2015
3,566
Without seeing a schematic diagram of your design, complete with all components and connections, we can't do much to help you.

I can take one wild guess, however: if you're trying to use a section of a TL072 as a comparator to get your square wave output, be aware that at 100 kHz your square wave won't be very "square"; it will be more like a distorted, asymmetrical trapezoid because of the TL072's limited slew rate (typically 13 V/μS ). If you want a good, clean square wave use a proper comparator (LM339, LT1116, etc.) instead.

#### nma

Joined Feb 1, 2016
15
there are chips designed for that, look up MAX038, XR2206, and such.
Thank you very much for the response. I tried to use the MC and MAX038 but could not get it in my area. Any alternative I would not mind.

#### nma

Joined Feb 1, 2016
15
The help you require is going to cost you dearly because it will require previous adivination to know what circuit you did implement.

Just in case, providing a schematic, the cost is much much lower. Please reconsider.

Ah, if urgent, cost goes high again.
Thanks for the response. I did not understand the response first but now clear. This is the circuit:

#### nma

Joined Feb 1, 2016
15
I think what AT is trying to say is - no schematic, no answers.

ak
Thanks for the explanation. I have sent the schematic.

#### nma

Joined Feb 1, 2016
15
Without seeing a schematic diagram of your design, complete with all components and connections, we can't do much to help you.

I can take one wild guess, however: if you're trying to use a section of a TL072 as a comparator to get your square wave output, be aware that at 100 kHz your square wave won't be very "square"; it will be more like a distorted, asymmetrical trapezoid because of the TL072's limited slew rate (typically 13 V/μS ). If you want a good, clean square wave use a proper comparator (LM339, LT1116, etc.) instead.
Thanks for the response. This is my schematic:

#### nma

Joined Feb 1, 2016
15
Without seeing a schematic diagram of your design, complete with all components and connections, we can't do much to help you.

I can take one wild guess, however: if you're trying to use a section of a TL072 as a comparator to get your square wave output, be aware that at 100 kHz your square wave won't be very "square"; it will be more like a distorted, asymmetrical trapezoid because of the TL072's limited slew rate (typically 13 V/μS ). If you want a good, clean square wave use a proper comparator (LM339, LT1116, etc.) instead.
Infact OB, I thought as much that TL072 could be the problem because of the slew rate. Please also check my other components because I am due to submit my work on wednesday.

#### dl324

Joined Mar 30, 2015
15,827
Please also check my other components because I am due to submit my work on wednesday.
If this is a school project for which you will be graded, that's considered homework and should be posted in the Homework Help forum so responders won't simply give you answers.

#### nma

Joined Feb 1, 2016
15
Without seeing a schematic diagram of your design, complete with all comPleponents and connections, we can't do much to help you.

I can take one wild guess, however: if you're trying to use a section of a TL072 as a comparator to get your square wave output, be aware that at 100 kHz your square wave won't be very "square"; it will be more like a distorted, asymmetrical trapezoid because of the TL072's limited slew rate (typically 13 V/μS ). If you want a good, clean square wave use a proper comparator (LM339, LT1116, etc.) instead.
Please these are also the triangular wave and sine wave circuits below. Any corrections will be highly appreciated.

triangular schematic from a simulation is

sine wave from electronic workbench: