LM3900: Lm359n

Terry Drof

Part Number: LM3900

I built up a simple audio amp using lm3900, gain of approximately 10, Inverting. Resistor between 12 volt supply and (+) non-inverting input is 270K, RFeedback from output to inverting input is 135K. Input resistor of 12k to inverting input. Current to non-inverting input 50uA, and Vout is set at VCC/2. This amp output drives directly the base of npn-pnp sziklai pair.

Okay, having said that, I like this combo, but want to try the LM359N norton amp due to it's much greater gain bandwidth capability and higher slew rate.

My question is, can I build up the LM359N amp using the same binding resistors? I've studied the data sheet formulas and I would think that's OK, but then this IC is programmable and I am not familiar with ISET IN pin 1, and ISET OUT pin8. Can I leave them open, or do they each have to be set with resistors?

Hope I was clear enough.

Thanks for any suggestions.

Terry

over 4 years ago

0 Tamara M Alani over 4 years ago

TI__Genius 10850 points

Hi Terry,

Thank you for your post. A picture is worth 1,000 words. Can you please send me a picture of the schematic? What is the input? What is the expected output?

I would like to understand your application so I can help you find a higher BW amplifier to do what you need.

-Tamara

0 Tamara M Alani over 4 years ago

TI__Genius 10850 points

Hello Terry,

We haven't heard from you in a while. We hope the issue was resolved. I am going to close this thread now. Please reply to re-open.

-Tamara

0 Terry Drof over 4 years ago in reply to Tamara M Alani

Prodigy 20 points

Hi Tamara,

My apologies, I just got real busy, and appreciate very much your offer of help.

I spent some time going over the data sheet for the LM359N, and am familiarizing myself with this chip on the breadboard. My problem is solved.

Thanks very much!

Terry

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LM3900: Lm359n