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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Hi again, Yeah i remember these from back in the ‘s. By continuing to use this site, you are consenting to our use of cookies. The non-inverting inputs should connect to half the supply voltage filtered with a capacitor to ground. It would be possible however to change the design a little to use a more typical op amp. The feedback resistor R3 is then: Roff Well-Known Member Nov 8, Electro Tech is an online community with overmembers who enjoy talking about and building electronic circuits, projects and gadgets.

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. The LM is not a normal OP amp. It can not be replaced with a LM op amp.

National Semiconductor

It’s very different than the LM Replacing a 4 pin leaded inductor with a 2 pin Started datasheeg gkmaia Yesterday at This ratasheet uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. Replacement Transformer Started by ncag 38 minutes ago Replies: Thread starter Neil Groves Start date Nov 7, For one thing, the input bias would be different.


Redesigning them for other op amps probably wouldnt be much of a problem really.

Hi, The LM was a very different kind of op datashet. One of the cool things about the LM is that the input voltage can exceed the supply rails without a lot of fancy stuff.

Welcome to our site! Media New media New comments Search media. It operates on the difference in input current rather than the difference in input voltages. Click here to register now. Hi, I’d be careful about using an AD for a replacement. 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.

To participate you need to register. 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 dtasheet is a 4V p-p sine wave from my generator, i am building the circuit here: I am surprised to see them in circuits today.

The LM is a high speed version. Thus you could look for the presence of line to speaker levels very easily and even filter the hiss.


I probably have few AD’s around, but i dont think i have any LM’s around anymore. Is an LM a good replacement for an LM?

LM Datasheet(PDF) – Motorola, Inc

From the LM data sheet it looks like the three amps with two caps each are just bandpass filters. From lm9300 i read, the NTE is a replacement. Potentiometer Questions Started by norbss Yesterday at Neil Groves New Member Nov 8, That’s what a specific timer of mine does.

Forums New posts Search forums. We can call the input resistor R1 and the resistor to ground R2 and the feedback resistor R3. The Q of each bandpass would be a little higher though so you’d have to dataeheet it and modify the values slightly if it doesnt seem to work the way you want it to.

Back in the 80’s i did. This may not be the lm39900 setup, but it might still work. Datasheets, Manuals or Parts. Jameco has the LM’s: For a better experience, please enable JavaScript in your browser before proceeding. Articles Top Articles Search resources. Neil Groves New Member Nov 7, Maybe this was a very old design.