Persamaan Ua741

There are many good reasons not to use the 1968-vintage LM741: - • Minimum recommended power supply rails are +/- 10 volts • Modern op-amps have power supplies that can be as low as 1.8 volts. • Input voltage range is typically from -Vs + 2 volt to +Vs - 2 volt • Modern op-amps can be chosen that are rail-to-rail • Input offset voltage is typically 1 mV (5 mV maximum) • Modern op-amps can easily be as low as a few micro volts and have low drift. If there weren't loads of textbooks dating back decades that used the 741 as an example, I'd be surprised if many people knew of it now. It'd now be remembered like the OC71, which was the BC108 of the mid/late 60s.

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One of the reasons I think it persisted for so long beyond the mid-80s, when it was well superseded, was because of its many bad characteristics. It is an example to teach students the characteristics to be concerned about, that highlight the inner workings of the op-amp. It has the input offset voltages, input current, needs the offset null, shows the bandwidth/gain product so vividly.

Few/no op-amps of 20 years past have brandished so many of these so prominently. I've been designing for 30 years, starting with mid-volume equipment in the mid-80s.

In my experience, the 741 wasn't anyone's choice then or since - there were always much better and cheaper parts to use. I imagine maybe I've worked on a circuit with one on in that time but I genuinely can't recall it. $ begingroup $ It is very common to see 741s listed at hobbyist vendors like adafruit or sparkfun or radioshack. It seems that they are one of the default 'jellybean' components that hobbyists are expected to use and learn simply because of the large number of example projects that one can find on the intertubes. These vendors are somehow able to sell them at up to 8x cost.

I suspect that most of the people using 741s now are hobbyists, and they simply don't know any other op-amp (since they possibly won't appreciate the complex subtleties involved in picking a better one). $ endgroup $ – May 10 '17 at 16:09. Another reason not to use a 741 is that under certain conditions it can go into a latch-up state, where the output saturates and sticks to one of the supply rails until it is powered down.

I can't find a reference specifically about the 741, but this page describes something similar: (search for the word 'latch-up' on the page). Just out of school, I built a thermostat for our fish-tank, using a 741 with a small amount of positive feedback to act as a comparator to switch the tank heater with a relay. Twice the 741 latched up and killed all our fish. No one has mentioned the social signalling aspect in that a circuit using a 741 will probably work with most any opamp, at least for a relaxed definition of 'work'. So if you need higher freq or different voltage limitations given that the original design was very vanilla, substituting a somewhat different amp will almost certainly work.