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Have an offset for 2V with OPA2134
Have an offset for 2V with OPA2134
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Old 27th August 2005, 10:05 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, 10:12 PM   #2
BrianL is offline BrianL  United States
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Have an offset for 2V with OPA2134
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, 06:40 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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File Type: jpg input stage opa2134.jpg (23.2 KB, 196 views)
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Old 28th August 2005, 02:21 PM   #4
peranders is offline peranders  Sweden
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Have an offset for 2V with OPA2134
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, 04:10 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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File Type: jpg input stage opa2134.jpg (21.8 KB, 136 views)
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Old 29th August 2005, 07:17 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, 01:31 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, 06:19 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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