tech-diy LM4780 board questions

Original Burnedfingers · 13th January 2007, 01:48 PM

I just received some LM4780 boards this week. I downloaded a schematic and I am wondering if there is a mistake in the downloaded copy. It shows C6 as a 4.7 uf value and has provisions to install (2) 100uf caps in series. Should this be (2) 10uf caps in series? Actually would the value be critical at all since it is the Ci to ground?

The gain on the non-inverting side of the amplifier looks like it would be 10.7 and the gain on the inverting side looks like 11.7

Am I not seeing things clearly?

jackinnj · 13th January 2007, 02:06 PM

the gain on the non-inverting side is 1 + R1/R2 (it's just an opamp on steroids), the inverting side gain is just the ratio of the two resistors.

you have the option of lowering the f3 of the amplifier by using larger coupling caps -- fwiw I used 4.7 uF polypropylene in the AX article.

13th January 2007, 01:48 PM	#1
Original Burnedfingers diyAudio Member Join Date: Nov 2002	tech-diy LM4780 board questions I just received some LM4780 boards this week. I downloaded a schematic and I am wondering if there is a mistake in the downloaded copy. It shows C6 as a 4.7 uf value and has provisions to install (2) 100uf caps in series. Should this be (2) 10uf caps in series? Actually would the value be critical at all since it is the Ci to ground? The gain on the non-inverting side of the amplifier looks like it would be 10.7 and the gain on the inverting side looks like 11.7 Am I not seeing things clearly?

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13th January 2007, 02:06 PM	#2
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	the gain on the non-inverting side is 1 + R1/R2 (it's just an opamp on steroids), the inverting side gain is just the ratio of the two resistors. you have the option of lowering the f3 of the amplifier by using larger coupling caps -- fwiw I used 4.7 uF polypropylene in the AX article.

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