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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The non-inverting inputs should connect to half the supply voltage filtered with a capacitor to ground. Jameco has the LM’s: The Q of each bandpass would be a little higher though so you’d have lm3900 try it and modify the values slightly if it doesnt seem to work the way you want it to.

It lm390 on the difference in input current rather than the difference in input voltages. Roff Well-Known Member Nov 8, Hi, I’d be careful about using an AD for a replacement.

The feedback resistor R3 is then: Neil Groves New Member Nov 7, Hi, The LM was a very different kind of op amp. Neil Groves New Member Nov 8, Articles Top Articles Search resources.


Electro Tech is an online community with overmembers who enjoy talking about and building electronic circuits, projects and gadgets. For one thing, the input bias would be different. 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. It would be possible however to change the design a little to use a more typical op amp. It can not be replaced with a LM op amp.

Replacement Transformer Started by ncag 59 minutes ago Replies: 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. Is an LM a good replacement for an LM?

Thread starter Neil Groves Start date Nov 7, The LM is not a normal OP amp. Redesigning them for other op amps probably wouldnt be much of a problem really. You must log in or register to reply here. I seem to have blown out on datasheef least two things here, i’m gonna scrap that project, build something else i need then come back to it using a different circuit. It’s very different than the LM This may not be the ideal setup, but it might still work.


The LM is a high speed version. Maybe this was a very lk3900 design.

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! Thus you could look for the presence of line to speaker levels very easily and even filter the hiss.

LM3900 Datasheet PDF

We can call the input resistor R1 and the resistor to ground R2 and the feedback resistor R3. From what i read, the NTE is a replacement. I am surprised to see them in circuits today. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.

Dayasheet New posts Search forums. Potentiometer Questions Started by norbss Yesterday at 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 dtaasheet.

Replacing a 4 pin leaded inductor with a 2 pin Started by gkmaia Yesterday datadheet Datasheets, Manuals or Parts. Click here to register now. Back in the 80’s i did.