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, It would be possible however to change the design a little to use a more typical op amp. Replacing a 4 pin leaded inductor with a 2 pin Started by gkmaia Yesterday at Is an LM a good replacement for an Daatasheet To participate you need to register.

It’s very different than the LM Datasheets, Manuals or Parts. This may not be the ideal setup, but it might still work. You must log in or register to reply here.

Hi again, Yeah i remember these from back in the ‘s. We can call the input resistor R1 and the resistor to ground R2 and the feedback resistor R3. Back in the 80’s i did. I probably have few AD’s around, but i dont think i have any LM’s around datasheeg.

I am surprised to see them in circuits today. The feedback resistor R3 is then: Articles Top Articles Search resources. For one thing, the input bias would be different. Jameco has the LM’s: 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.

  ASTM D6439 PDF

The LM is not a normal OP amp. By continuing to use this site, you are consenting to our use of cookies. It can not be replaced with datashret LM op amp. That’s what a specific timer of mine does. 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: Electro Tech is an online community with overmembers who enjoy talking about and building electronic circuits, projects and gadgets.

From what i read, the NTE is a replacement.

National Semiconductor

Forums New posts Search forums. 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. Thus you could look for the presence of line to speaker levels very easily and even filter the hiss.

Media New media New comments Search media. 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 problem really.


Thread starter Neil Groves Start date Nov 7, For a better experience, please enable JavaScript in your browser before proceeding.

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. Lm33900 site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. Hi, The LM was a very different kind of op amp. 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, It operates on the difference in input current rather than the difference in input voltages.

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The LM is l3900 high speed version. Maybe this was a very old design. Hi, I’d be careful about using an AD for a replacement. One of the cool things about the LM is that the input voltage can exceed the supply rails without a lot of fancy stuff.