![]() ![]() Therefore use the manufacturer's logo on the top of the LM741CN and LM741CP ICs to identify the manufacturer, and then locate the relevant datasheet on their website if you want to find more details. Other packaging type letters are also used, but these can all vary between manufacturers. In this context, "N" and "P" suffixes both mean plastic DIP packages. The suffix "P" = plastic DIP package type is used by some other manufacturers - Texas Instruments also use the suffix "P" to indicate plastic DIP packages on some of their ICs. National Semiconductor / some Texas Instruments. The suffix "N" = plastic DIP package type is used by some manufacturers e.g. LM741C = commercial temperature range LM741.ĭo these last letters N and P mean anything like p type or n type? So my question is are these LM741CN and LM741CP different? Good! So as I explained above, this result tells us that the LM741CN ICs you tried earlier, are faulty. One of my friends had a LM741CP IC and I plugged into the same proto board with the same pin configuration and it worked. ![]() Depending where your shop sourced the components, then these are some of the possibilities you should consider. Ebay and similar sources outside the official manufacturer's supply chain, have a higher chance of counterfeit components. Shops can get faulty batches of components, or perhaps counterfeit etc. (I assumed that it's not possible for 6 chips to be burnt like that) I tried 4 other 741CN ICs I bought from the shop the same day and all not working. Since you explain later that a replacement LM741CP worked OK in the same circuit, then that strongly suggests that the LM741CN ICs were faulty. Addition to that, the IC seems to be heating up a lot.Īny ICs heating up when they should be dissipating negligible power, is a clear indication that either they are faulty (perhaps counterfeit), or you have made a mistake in your circuit construction / design. I tried with another LM741CN IC and it gave the same result. So I tried creating a basic inverting amplifier using this IC and the oscilloscope showed the same input signal like waveform as the output signal. there is no RS-232 connection shown on your schematic, and you want to "create a background" - a background what? Background lights? Background music? Background dancing? :-) There is no explanation in your schematic, so readers won't understand your actual project and cannot take those details of your project into account in any answers. Just to let you know, this description of your project doesn't make sense e.g. The project description was to create a background. I used LM741CN OpAmp for this and found out that nothing comes out as the output when connected to a RS232. I'm having an analog project where I have to amplify a weak signal coming out of a photo transistor. However I can answer the main question and give a suggestion for a possible cause of your problem: Unfortunately some parts of your project are unclear. Was just wondering why CN didn't work when CP did. Since I couldn't make the circuit with 6 741CN ICs, I used LM386 and it worked. ![]() My problem is about the difference between LM741CN and LM741CP. So my question is are these LM741CN and LM741CP different? Do these last letters N and P mean anything like p type or n type?ĮDIT: Here I've added the circuit diagram I used to create the inverting amplifier. (I assumed that it's not possible for 6 chips to be burnt like that) One of my friends had a LM741CP IC and I plugged into the same proto board with the same pin configuration and it worked. Then I tried a non inverting amplifier but that didn't work too. Addition to that, the IC seems to be heating up a lot. Simulate this circuit – Schematic created using CircuitLab ![]()
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