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I have tried using a pot for both the offset and gain and it does not work with that single op-amp circuit. I'm stuck with one of two situations:
1. The ouptut is -3.3v to 3.3v with 0 or 3.3v input respectively, but the 1.65v input results in a non-zero output (by 0.15volts or so).
2. With...
Ok, here's a simpler circuit which still does not do what I would like. If I set the offset value such that 0v from the dac = 3.3v and 3.3v from the dac = -3.3v, then 3.3v/2 from the dac results in 0.15v output! Doh! In this situation, is my only solution an op-amp with lower offset? Thanks!
Here is the schematic for the version that does not work.
Even if I do add the offset pot circuit to the second op-amp (but using the -9v vs +9v), isn't it just going to flip the issue to the other side?
This is not for an audio application
The circuit does give me about -6.6v and +6.6v currently (although slightly shifted due to a voltage gain offset so one extreme is a tad high and one extreme is a tad low) so I'm quite certain my gain calculation is correct. The input is centered at...
Well, it's a 12 bit dac and I would like to have the best resolution I can.. but if I got away with 10 bits, I wouldn't be too upset. I'm updating this at 115khz.
How much will one op-amp vary from another? I.e. if I got a theoretical 100 tl074 op-amps, will they all require the same offset, or...
I have a dac that outpus a single ended signal (0-3.3v) which I need to convert into a differential signal. The differential signal needs to range from -6.6v to +6.6v (i.e. channel A ranges from -3.3v to +3.3v and channel B ranges from -3.3v to +3.3v). Channel A and Channel B are centered around...
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