Have an offset for 2V with OPA2134 - diyAudio
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Old 27th August 2005, 11:05 PM   #1
Progg70 is offline Progg70  Sweden
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Cool Have an offset for 2V with OPA2134

If I have an OP with no possibility to adjust the output offset. How can I then have about 2V offset? Iím 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
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Old 27th August 2005, 11:12 PM   #2
BrianL is offline BrianL  United States
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You need to give some useful information if you expect
help. At a minimun, a circuit diagram would be instructive.
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Old 28th August 2005, 07:40 AM   #3
Progg70 is offline Progg70  Sweden
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Good morning!

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

Progg70
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Old 28th August 2005, 03:21 PM   #4
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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.
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Old 28th August 2005, 05:10 PM   #5
Progg70 is offline Progg70  Sweden
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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 Iím really happy.

Regard
Progg70
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Old 29th August 2005, 08:17 AM   #6
wa2ise is offline wa2ise  United States
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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.
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Old 29th August 2005, 02:31 PM   #7
Progg70 is offline Progg70  Sweden
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Tanks! Exactly what i needed.
Iím 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
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Old 30th August 2005, 07:19 AM   #8
Progg70 is offline Progg70  Sweden
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Thumbs up Yes!

Yes!
Itís working very nice. I have de circuit ready now so Iím starting with the PCB.

Thanks

Progg70
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