audioguru said:
A lousy old 741 opamp is 40 years old. It is designed for low frequencies because its max frequency for full output is only 9kHz. It is designed for a 30V supply. Its inputs and outputs don't work when they are within about 3V from a positive or negative supply voltage.
The MCP6001 is designed for a 1.8V to 6.0V supply. It produces full output up to 30kHz. Its inputs work fine at either supply voltage and when the load current is low the outputs go to either supply voltage.
Thanks for the quick answer. I knew most of this, (had no idea about 3V dead zone) ... the frequency is not big issue as I'm only using it to oscilate mosfet to get from 5V to 14V so it's maybe 3KHz... and in this 5th world country, I cannot find the MCP6001 that looks ideal for the job .. the OP's I have at home are:
739, 741, 747, 748, CA3054, L272, L272M, LM224N, LM2904N, LM308N, LM3900N, LM392N, LM833N, MC4558CN and RC4559N ...
now, with what I know about OP's (and that's not much) any of these should be able to "drive" the mosfet to generate V I need. but, I have all these lying around (more then 50 741's
) so that's why I asked about it first, but if you can recognise a good one among these ones I mentioned above
I will be grateful