Hello, I just started my journey with op-amps. I'd like to use it to amplify XR2206 based generator. I'm trying to set it up as non-inverting amplifier. I connected it as follows.


Gain should be around ~6, and my generator outputs signal with amplitute 1-2 V adjustable. However, probing between OUT and battery mass I don't see any signal. I would be glad for any clues.

 

I see no ground reference in your circuit...

 

The input to an opamp is very high impedance. That means that little to no current will flow into the input. A current source will not appreciably affect the voltage on Pin 3. Use a voltage source. The opamp will look at the voltage difference between the two inputs and adjust the output to drive the voltage on pin 2 to the same level as on pin 3.

 

hi 144,
Welcome to AAC.
Is there a DC voltage on the XR2206 outpur.?
E

 

hi 144,
Welcome to AAC.
Is there a DC voltage on the XR2206 outpur.?
E

It outputs sine wave (AC output) with adjustable frequency, 50 Hz in that case.

 

I see no ground reference in your circuit...

Ground reference in that case is between batteries connection, to achieve negative voltage.

 

I see no ground reference in your circuit...

As far as I'm concerned, it is voltage source.

 

hi,
Your connections to the TL062 look OK.

Do you have a photo shot of the wiring you could post.?

E

 

hi,
Your connections to the TL062 look OK.

Do you have a photo shot of the wiring you could post.?

E

 

Try connecting a resistor from pin 3 to ground

There's little error in schematic tho but not wiring

Measure the voltages at pin 4 and pin 8

Also at pin 3 and 2 and 1
DC voltages

 

As far as I'm concerned, it is voltage source.

The opamp and the simulator might not care what you think. Labeling a voltage source "I1" is more than a bit unusual. It strongly suggests that it is a current source. They are most definitely not the same thing.

 

I added this reference resistor, none improvement tho.

pin 8 -> 9.3 V
pin 4 -> -9.3 V
pin 1 -> 0.39 V
pin 2 -> 0.08 V
pin 3 -> 1.13 V

Here are the voltage levels. Not supposed to be like that. I should mention, its brand new part.

 

On the breadboard sketch (24) there is no component connected to pin 2. I can't make out what goes where in the photo (25).
If pins 4 and 8 are shorted internally, as your voltage readings suggest, the IC is toast and the batteries soon will be.

 

On the breadboard sketch (24) there is no component connected to pin 2.

Yes ur right, my mistake. There is provided a signal from voltage divider on pin 2 in the real project.

 

I just started my journey with op-amps.

Your schematic would be easier to read if you drew it more conventionally.

 

oh wait.. 47k?

In image it looks like 4.7k

The resistor values are correct sir?

Anyways, shouldn't be a problem

Measure your input signal again, change the op amp

You are surely making a mistake somewhere

 

Why does the opamp have a dual polarity supply and the XR2206 has no power supply?
If they both use a single positive supply and the opamp +input is biased at half the supply voltage and has its input capacitively coupled to the XR2206 output then it will work fine.

I see these voltages on the circuit when the opamp has a dual polarity supply:

 

Why does the opamp have a dual polarity supply and the XR2206 has no power supply?
If they both use a single positive supply and the opamp +input is biased at half the supply voltage and has its input capacitively coupled to the XR2206 output then it will work fine.

I see these voltages on the circuit when the opamp has a dual polarity supply:

I'm using a module based on XR2206 cheap, its supplied with an external source. I just didn't have a clue how to present it on schematics. It has signal and ground pin, I put sine signal at (+) input and module ground to batteries supply ground.

 

I show the opamp with the same DC voltage on both inputs. Then the output voltage will be +6.44VDC and the waveform will have its top clipping if the input signal is increased.

 

Ground reference in that case is between batteries connection, to achieve negative voltage.

And for what reason it is not shown in the diagram?