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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Thus you ratasheet look for the presence of line to speaker levels very easily and even filter the hiss. For one thing, the input bias would be different. Roff Well-Known Member Nov 8, The feedback resistor R3 is then: You must log in or register to reply here. The LM is a high speed version.

LM substitute? | Electronics Forum (Circuits, Projects and Microcontrollers)

Is an LM a good replacement for an LM? It operates on the difference in input current rather than the difference in input voltages. By continuing to use this site, you are consenting to our use of cookies. One of the cool things about the LM is lm900 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. Hi again, Yeah i remember these from back in the ‘s.

LM3900 Quad Op Amp IC

Jameco has the LM’s: From what i read, the NTE is a replacement. From the LM data sheet it looks like the three amps with two caps each are just bandpass filters. The non-inverting inputs should connect to half the supply voltage filtered with a capacitor to ground. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.

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I probably have few AD’s around, but i datawheet think i have any LM’s around anymore.

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

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. It’s very different than the LM 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: Welcome to our site!

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It can not be replaced with a LM datashheet amp. Maybe this was a very old design. Datasheets, Manuals or Parts. I am surprised to see them in circuits today. For a better experience, please enable JavaScript in your browser before proceeding.

National Semiconductor

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. Back in the 80’s i did. Neil Groves New Member Nov 7, The LM is not a normal OP amp.


Neil Groves New Member Nov 8, To participate you need to register. Replacement Transformer Started by ncag 59 minutes ago Replies: Thread starter Neil Groves Start date Nov 7, Click here to register now.

We can call the input resistor R1 and the resistor to ground R2 and the feedback resistor R3.

This may not be the ideal setup, but it might still work. I seem to have blown out on at least two things here, i’m gonna scrap that datasheeet, build something else i need then come back to it using a different circuit.

Replacing a 4 pin leaded inductor with a 2 pin Started by gkmaia Yesterday at Forums New posts Search forums.

Media New media New comments Search media. Redesigning them for other op amps probably wouldnt be much of a problem really.

It would be possible however to change the design a little to use a more typical op amp. Hi, The LM was a very different kind of op amp. Articles Top Articles Search resources. Potentiometer Questions Started by norbss Yesterday at That’s what a specific timer of mine does.