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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LM3900 Datasheet PDF

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

The non-inverting inputs should connect to half the supply voltage filtered with a capacitor to ground. 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 dxtasheet 10V dataxheet 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.

For a better experience, please enable JavaScript in your browser before proceeding. It’s very different than the LM It operates on the difference in input current rather than the difference in input voltages. I seem datassheet 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.


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

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

One of the cool things about the LM is that the input voltage can exceed the supply dafasheet without a lot of fancy stuff. I am surprised to see them in circuits today.

Electro Tech is an online community with overmembers who enjoy talking lmm3900 and building electronic circuits, projects and gadgets. Hi, The LM was a very different kind of op amp.

LM3900 Quad Op Amp IC

Articles Top Articles Search resources. Replacement Transformer Started by ncag 59 minutes ago Replies: The LM is a high speed version.

Maybe this was a very old design. Thus you could look for the presence of line to speaker levels very easily and even filter the hiss. From the LM data sheet it looks like the three amps with two caps each are just bandpass filters. Welcome to our site! Roff Well-Known Member Nov 8, From what i read, the NTE is a replacement. Hi, I’d be careful about using an AD for a replacement. Neil Groves Lm390 Member Nov 8, Jameco has the LM’s: This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.


The feedback resistor R3 is then: Forums New posts Search forums.

To participate you need to register. Is an LM a good replacement for an LM? Redesigning them for other op amps probably wouldnt be much of a problem really. Neil Groves New Member Nov 7, Replacing a 4 pin leaded datashdet with a 2 pin Started by gkmaia Yesterday at