| Electronics > Beginners |
| Function Generator and OpAmp |
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| bd139:
--- Quote from: In Vacuo Veritas on June 12, 2018, 07:21:55 pm --- --- Quote from: bd139 on June 12, 2018, 06:45:04 am ---741 is absolutely fine to learn with. No nasty surprises and it’s far from ideal so you can learn about the limitations of opamps easily. --- End quote --- Also less likely to oscillate at 500MHz on a breadboard with 6 inch long wires everywhere. --- End quote --- Yep that’s a very good point too. My go to opamps are: MCP6201 GP low voltage. Cheap as chips. Does the job. LMC6482 GP high voltage and dual rail. LTC1150 chopper. Low offset apps, integration fun. OP400 low noise quad. Got tubes of LM741, LF356, LF411, LM358 floating around I haven’t touched for a while. They’re good but I don’t want to use designs that use dual rails these days. Too much hassle :) |
| Zero999:
--- Quote from: bd139 on June 12, 2018, 07:49:03 pm --- --- Quote from: In Vacuo Veritas on June 12, 2018, 07:21:55 pm --- --- Quote from: bd139 on June 12, 2018, 06:45:04 am ---741 is absolutely fine to learn with. No nasty surprises and it’s far from ideal so you can learn about the limitations of opamps easily. --- End quote --- Also less likely to oscillate at 500MHz on a breadboard with 6 inch long wires everywhere. --- End quote --- Yep that’s a very good point too. My go to opamps are: MCP6201 GP low voltage. Cheap as chips. Does the job. LMC6482 GP high voltage and dual rail. LTC1150 chopper. Low offset apps, integration fun. OP400 low noise quad. Got tubes of LM741, LF356, LF411, LM358 floating around I haven’t touched for a while. They’re good but I don’t want to use designs that use dual rails these days. Too much hassle :) --- End quote --- Any op-amp can be used with dual rails. One just has to ensure the common mode range isn't exceeded and the OP400 isn't a single supply op-amp, as its common mode range doesn't include the negative rail. The MCP6201 and LMC6482 are only rated to 6V and 16V respectively. The LM358 is fine for single supply, DC applications. Also check out the LM321, which is the single version of the LM358, comes in a tiny package and is extremely cheap. |
| bd139:
Sorry my point should have been more clear. I’d rather build a system that has a single supply at low voltage therefore requires the inputs and outputs to get relatively close to the rails. Not a lot of room at 5v. But it keeps the power arrangements simpler. OP400 you’re right. I’ve used exactly two of those and they had 24v available. |
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