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National Semiconductor LM and. LM, Respectively description. These devices consist of four independent, high- gain frequency-compensated Norton. LM description These devices consist of four independent, high gain frequency-compensated Norton operational amplifiers that were designed. LM MC Unit. Supply Voltage. VCC. + + V. Input Current. Iin. mA on the individual data sheets and the Selector Guide. All of the.

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The LM is a high speed version.

One of the cool things about the LM is that the input voltage can exceed the supply rails without a lot of fancy stuff. Hi, I’d be careful about using an AD for a replacement. It can not be replaced with a LM op amp.

Maybe this was a l3m900 old design. Articles Top Articles Search resources.

To participate you need to register. Click here to register now. I probably have few AD’s around, but i dont think i have any LM’s around anymore. From what i read, the NTE is a replacement.

The LM is not a normal OP amp. The Q of each bandpass would be a little higher though so you’d have to try it and modify the values slightly if it doesnt seem to work the way you want it to. I am surprised to see them in circuits today. Datasheeet in the 80’s i did.


LM3900 Quad Op Amp IC

The circuit uses a single polarity supply so grounding the non-inverting input of the opamps would cause their outputs to be grounded and they would work like rectifiers. I couldn’t locate one of the latter so relayed l,3900 circuit to use an LM instead, well it doesn’t work, i checked my output from the first stage and it sits at 10V although the input is a 4V p-p sine wave from my generator, i am building the datasheer here: Jameco has the LM’s: Hi again, Yeah i remember these from back in the ‘s.

Replacement Transformer Started by ncag 38 minutes ago Replies: Neil Groves New Member Nov 8, For one thing, the input bias would be different. Redesigning them for other op amps probably wouldnt be much of a problem really.

Welcome to our site! The feedback resistor R3 is then: It operates on the difference in input current rather than the difference in input voltages. Forums New posts Search forums. Thus you could look for the presence of line to speaker levels very easily and even filter the hiss. This site uses dstasheet to help personalise content, tailor your experience and to keep you logged in if you register. satasheet


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Electro Tech is an online community with overmembers who enjoy talking about and building electronic circuits, projects and gadgets. It’s very different than the LM Is an LM a good replacement for an LM? This may not be the ideal setup, but it might still work. The non-inverting inputs should connect to half the supply voltage filtered with datasheef capacitor to ground.

By continuing to use this site, you are consenting to our use of cookies. For a better experience, please enable JavaScript in your browser before proceeding. Datasheets, Manuals or Parts. We can call the input resistor R1 and the resistor to ground R2 and the feedback resistor R3. It would be possible however to change the design a little to use a more typical op amp.

I seem to have blown out on at least two things here, i’m gonna scrap that project, build something else i need then come back to it using a different circuit. You must log in or register to reply here. From the LM data sheet it looks ddatasheet the three amps with two caps each are just bandpass filters.