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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Neil Groves New Member Nov 7, From the LM data sheet it looks like the three amps with two caps each are just bandpass filters.

Datasheets, Manuals or Parts. Hi, The LM was a very different kind of op amp. It can not be replaced with a LM op amp. 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.

From what i read, the NTE is a replacement. Electro Tech is an online datasueet with overmembers who enjoy talking about and building electronic circuits, projects and gadgets. Welcome to our site!

LM Datasheet(PDF) – Motorola, Inc

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.

Potentiometer Questions Started by norbss Yesterday at Click here to register now. Roff Well-Known Member Nov 8, You must log in or register to reply here. Replacement Transformer Datssheet by ncag 59 minutes ago Replies: This may not be the ideal setup, but it might still work. One of the cool things about the LM is that the input voltage can exceed the supply rails without a lot of fancy stuff.


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For a better experience, please enable JavaScript in your browser before proceeding. Thus you could look datsaheet the presence of line to speaker levels very easily and even filter the hiss.

LM3900 Quad Op Amp IC

Media New media New comments Search media. 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: By continuing to use this site, you are consenting to our use of cookies.

It operates on the difference in input current rather than the difference in input voltages. Hi, I’d be careful about ratasheet an AD for a replacement.

LM3900 Datasheet PDF

Maybe this was a very old design. Hi again, Yeah i remember these from back in the ‘s.

This site uses cookies to help personalise content, tailor your experience datashedt to keep you logged in if you register. The feedback resistor R3 is then: For one thing, the input bias would be different.


Thread starter Neil Groves Start date Nov 7, We can call the input resistor R1 and the resistor to ground R2 datashet the feedback resistor R3.

Is an LM a good replacement for an LM? It’s very different than the LM Forums New posts Search forums. The LM is not a normal OP amp. It would be possible however to change the design a little to use a more typical 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 probably have few AD’s around, but i dont think i have any LM’s around anymore. That’s what a specific timer of mine does. The LM is a high speed version. Neil Groves New Member Nov 8, The non-inverting inputs should connect to half the supply voltage filtered with a capacitor to ground.

Redesigning them for other op amps probably wouldnt be much of a fatasheet really. I am surprised to see them in circuits today.

Back in the 80’s i did. Jameco has the LM’s: To participate you need to register. Replacing a 4 pin leaded inductor with a 2 pin Started by gkmaia Yesterday at