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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Roff Well-Known Member Nov 8, Neil Groves New Member Nov 8, Thread starter Neil Groves Start date Nov 7, Media New media New comments Search media. It can not be replaced with a LM op amp. Datasheets, Manuals or Parts. To participate you need to register. It would be possible however to change the design a little to use a more typical op amp.

We can call the input resistor R1 and the resistor to ground R2 and the feedback resistor R3. Hi, I’d be careful about using an AD for a replacement.

It operates on the difference in input current rather than the difference in input voltages. For one thing, the input bias would be different. I probably have few AD’s around, but i dont think i have any LM’s around anymore. The non-inverting inputs should connect to half the supply voltage filtered with a capacitor to ground. Back in the 80’s i did. 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.


Maybe this was a very old design. 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. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.

(Datasheet) LM pdf – (LM / LM / LM) Quad Amplifiers (1-page)

Hi again, Yeah i remember these from back in the ‘s. It’s very different than the LM You must log in or register to reply here. I am surprised to see them in circuits today.

By continuing to use this site, eatasheet are consenting to our use of cookies. Welcome to our site! I couldn’t locate one of the latter so relayed my 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 circuit here: From the LM data sheet it looks like the three amps with two caps each are just bandpass filters.

Neil Groves New Member Nov 7, Articles Top Articles Search resources. Hi, The LM was a very different kind of op amp. Replacement Transformer Started by dwtasheet 59 minutes ago Replies: Thus you could look for the presence of line to speaker levels very easily and even filter the hiss.


Potentiometer Questions L,3900 by norbss Yesterday at One of the cool things about the LM is that the input voltage can exceed the supply rails without a lot of fancy stuff. The feedback resistor R3 is then: Jameco has the LM’s: Click here to register now.

LM3900 Quad Op Amp IC

For a better experience, please enable JavaScript in your browser before proceeding. Replacing a 4 pin leaded inductor with a 2 pin Started by gkmaia Yesterday at That’s what a specific timer of mine does. Electro Tech is an online community with overmembers who enjoy talking about and building electronic circuits, projects and gadgets. This may not be the ideal setup, but it might still work.

Redesigning them for other op amps probably wouldnt be much of a problem really. Is an LM a good replacement for an LM? The LM is a high speed version. From what i read, the NTE is a replacement. I seem to have blown out on at least two things here, i’m gonna scrap that project, build something else datasheett need then come back to it using a different circuit.

The LM is not a normal OP amp. Forums New posts Search forums.