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Old 22nd November 2006, 04:03 AM   #11
Bengali is offline Bengali  United States
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My preamp wants to see an input impedence of 50K or higher. If I use the chipamp.com design, 1K series and 22K to ground to the non inverting input, what impedence would I get?

I read on this forum about it being the parallel resistance of the series input resistor(1K), the resistor to gnd(22K) and the pot resistance at the current position. This would mean the input impedence the preamp see would always be lower than 22K?

would I need to change the input resistor and resistor to gnd to higher values?

thanks for the clarification!
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Old 22nd November 2006, 08:33 PM   #12
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Default Re: LM3886 sound

Quote:
Originally posted by Bengali
Hi,

I'm don't want to stir up any trouble. I'm just looking for input on the sound quality of the lm3886. Is it similiar to the LM3875?

I have 6ohms speakers so decided to go the 3886 route.
How does the 3886 chip amp compare to your off the shelf brand amps?

I ordered an Onkyo M-282 amp for $200.00. It would cost me about $250 to build a regulated 3886 chip amp(w/chassis) and have less power.

Do people build chip amps mainly as a hobby, learning experience or for the actual sound performance?

thanks for your comments.

Whoa, you're spending a lot of money to make a GC. I made/(am still making but I don't need any more parts) a GC for about $100. Thats the case, psu, components, pcb and everything else that's needed.
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Old 22nd November 2006, 08:42 PM   #13
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"My preamp wants to see an input impedence of 50K or higher. If I use the chipamp.com design, 1K series and 22K to ground to the non inverting input, what impedence would I get?

I read on this forum about it being the parallel resistance of the series input resistor(1K), the resistor to gnd(22K) and the pot resistance at the current position. This would mean the input impedence the preamp see would always be lower than 22K?

would I need to change the input resistor and resistor to gnd to higher values?"


I hope you get a good answer to this. It's a very interesting subject.
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