Have an offset for 2V with OPA2134

[Progg70]

If I have an OP with no possibility to adjust the output offset. How can I then have about 2V offset? I’m looking for a nice circuit solution. I have one OP for the input and another like a driver before the output stage. The Output stage need a offset for about 1.9V to have 0V on the output. I use the OP OPA2134.

regard

Progg70

 

[BrianL]

You need to give some useful information if you expect
help. At a minimun, a circuit diagram would be instructive.

 

[Progg70]

Good morning!

OK! I have now an attachment with the circuit. I need a offset for + 2V on the output.
Regard

Progg70

 

[peranders]

If you have an AC coupled output you won't get any offset at all.

If you tell us the application it may be easier to understand what you are after.

 

[Progg70]

OK! My mistake! You can skip the capacitor at the end, they was there from the beginning.

So, the output is the DC-coupled and I need to have the audio signal +2V offset.
The output signal is going to have about 20V top-top. If someone can tell me a nice configuration to adapt to this circuit I’m really happy.

Regard
Progg70

 

[wa2ise]

To create a +2V offset on the output, move the 10K resistor R6 from ground to a clean source of -3/4 volt. What this does is to draw current from the output, thru the 27K feedback resistor, and then on to the 10K resistor to the -0.75V supply. The op amp's inverting input is kept at 0V, and thus the output willo to +2V. The audio signal is amplified as before. This is essentially an adder circuit.

 

[Progg70]

Tanks! Exactly what i needed.
I’m going to try it in the afternoon.
Now I hope my small single end-amp. will bee ready for a first test to the weekend.

Regard

Progg70

 

[Progg70]

Yes!

Yes!
It’s working very nice. I have de circuit ready now so I’m starting with the PCB.

Thanks

Progg70