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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Jameco has the LM’s: You must log in or register to reply here. Hi, The LM was a very different kind of op amp. I am surprised to see them in circuits l3m900.

LM Quad Op Amp IC | NightFire Electronics LLC

The LM is not a normal OP amp. Welcome to our site! From what i read, the NTE is a replacement.

This may not be the ideal setup, but it might still work. The non-inverting inputs should connect to half the supply voltage filtered with a capacitor to ground. Hi again, Yeah i remember these from back in datzsheet ‘s.

LM3900 Datasheet PDF

To participate you need to register. Redesigning them for other op amps probably wouldnt be much of a problem really. Thread starter Neil Groves Lm39000 date Nov 7, Thus you could look for the presence of line to speaker levels very easily and even filter the hiss. 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. 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: It’s very different than the LM It would be possible however to change the design a little to use a more typical op amp. The LM is a high speed version.

Roff L3m900 Member Nov 8, Maybe this was a very old design. From the LM data sheet it looks like the three amps with two caps each are just bandpass filters. 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 lj3900 work like rectifiers.

Replacement Transformer Started by ncag 59 minutes ago Replies: Hi, I’d be careful about using an AD for a replacement. For one thing, the input bias would be different.

LM Datasheet(PDF) – TI store

Articles Top Articles Search resources. Potentiometer Questions Started by norbss Yesterday at Electro Tech is an online community with overmembers who enjoy talking about and building electronic circuits, projects and gadgets. By continuing to use this site, datzsheet are consenting to our use of cookies. We can call the input resistor R1 and the resistor to ground R2 and the feedback resistor R3.

LM3900 Quad Op Amp IC

Click here to register now. It can not be replaced with a LM op amp. Is an LM a good replacement for an LM? Neil Groves New Member Nov 7, Datasheets, Manuals datashfet Parts.


For a better experience, please enable JavaScript in your browser before proceeding. 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. Replacing a 4 pin leaded inductor with a 2 pin Started by gkmaia Yesterday at Back in the 80’s i did.

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 datssheet although the input is a 4V p-p sine wave from my generator, i datasheeet building the circuit here: One of the cool things about the LM is that the input voltage can exceed the supply rails without a lot of fancy stuff.

It operates on the difference in input current rather than the difference in input dataaheet. Neil Groves New Member Nov 8, Media New media New comments Search media.

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. Forums New posts Search forums.