Michael Circuit
New Member
I am trying to build a triangle waveform generator using an lm 741 and this link **broken link removed** as a guide, all i am getting is a square wave out of each oscillator? any ideas?
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using an lm741 i am able to generate a square wave. If the input to my second lm741 IC is a square wave the capacitor and grounded resistor in the second IC should turn the square wave into a triangle wave. by connecting a capacitor between the inverting input and the output and grounding the noninverting input I should be able to ramp down the output.which should make a triangle wave.. instead I get a wave form that looks like a square wave with a roof on it, it looks like a house on the oscilloscope, thats the best way to describe it, its a mix between a triangle wave and a square wave not what im aiming for. no matter what the R & C are i still get this bizzare looking waveshape
using an lm741 i am able to generate a square wave. If the input to my second lm741 IC is a square wave the capacitor and grounded resistor in the second IC should turn the square wave into a triangle wave. by connecting a capacitor between the inverting input and the output and grounding the noninverting input I should be able to ramp down the output.which should make a triangle wave.. instead I get a wave form that looks like a square wave with a roof on it, it looks like a house on the oscilloscope, thats the best way to describe it, its a mix between a triangle wave and a square wave not what im aiming for. no matter what the R & C are i still get this bizzare looking waveshape
This circuit uses two opamps so it should use a dual opamp.what op amps would you recommend instead of the 741?
ericgibbs
what op amps would you recommend instead of the 741?
The circuit you posted works perfectly.can anyone post schematics of other simple circuits they know will work? Ive been trying a bunch found online with little success.
for example
https://www.electro-tech-online.com/attachments/triangle-wave-oscillator-png.28722/
The circuit you posted works perfectly.
With a positive and negative 9V supply, its square-wave output is about 16V peak-to-peak into a 10k load to ground and its triangle-wave output is about 13V peak-to-peak into a 10k load to ground.
Its outputs can drive a load as low as 1k ohms but then its output levels might drop to half.
A lousy old LM358 dual opamp has a very poor high frequency response so if it is used in this circuit its square-wave and triangle-wave will have poor wave shapes.I should be able to apply this circuit to any dual op amp correct?
This circuit still does not work properly, I can not generate any waveform using this schematic https://www.electro-tech-online.com/attachments/triangle-wave-oscillator-png.28722/. I fail to see how this is a comparator/integrator circuit. Shouldnt the inverting input of the comparator have a capacitor connected to ground to generator a square wave which would then slightly ramp down through the integrators inverting capacitor generating a triangle wave?
it was easier to just make a new one, i couldnt remember my password or what e-mail account i used for the original. anyway I cant get this to work, ive tried so many combo's of a triangle wave oscillator my heads spinning... hhhmmm... could it be the dc power supply? i can get a square wave just fine.. triangle wave.. not even close.