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.

Author: Doule Voodoogami
Country: Malta
Language: English (Spanish)
Genre: History
Published (Last): 16 November 2016
Pages: 76
PDF File Size: 7.44 Mb
ePub File Size: 6.76 Mb
ISBN: 790-4-97027-402-3
Downloads: 26259
Price: Free* [*Free Regsitration Required]
Uploader: Zololkree

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. The LM is a high speed version. Jameco has the LM’s: 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: It operates on the difference in input current rather than the difference in input voltages.

Hi, The LM was a very different kind of op amp. Forums New posts Search forums.

This may not be the ideal setup, but it might still work. Thus you could look for the presence of line to speaker levels very easily and even filter the hiss.


LM , Tube LM; R̦hre LM ID, IC РIntegrated

Welcome to our site! Articles Top Articles Search resources. It’s very different than the LM 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 It would be possible however to change the design a little to use a more typical op amp.

Datasheets, Manuals or Parts. For a better experience, please enable JavaScript in your browser before proceeding. Is an LM a good replacement for an LM?

LM Datasheet(PDF) – Motorola, Inc

Media New media New comments Search media. That’s what a specific timer of mine does. I probably have few AD’s around, but i dont think i have any LM’s around anymore. Datasheer feedback resistor R3 is then: 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 fatasheet like rectifiers.

Hi again, Yeah i remember these from back in the ‘s. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. The LM is not a normal OP amp.

Roff Well-Known Member Nov 8, Neil Groves New Member Nov 8, Click here to register now. From what i read, the NTE is a replacement. You must log in or register to reply here.

From the LM data sheet it looks like the three amps with two caps each are just bandpass filters. Replacing a 4 pin leaded inductor with a datashert pin Started by gkmaia Yesterday at The non-inverting inputs should connect to half the supply voltage filtered with a capacitor to ground.


Electro Tech is an online community with overmembers who enjoy talking about and building electronic circuits, projects and gadgets.

Redesigning them for other op amps probably wouldnt be much of a problem lm39900. I am surprised to see them in circuits today. For one thing, the input bias would be different.

LM3900 substitute?

We can call the input resistor R1 and the resistor to ground R2 and the feedback resistor R3. Replacement Transformer Started by ncag 59 minutes ago Replies: Maybe this was a very old design.

By continuing to use this site, you are consenting to our use of cookies. It can not be replaced with a LM op amp. Hi, I’d be careful about using an AD for a replacement. One of the cool things about the LM is that the input datasbeet can exceed the supply rails without a lot of fancy stuff. Back in the 80’s i did. To participate you need to register. Thread starter Neil Groves Start date Nov 7, Neil Groves New Member Nov 7,