Wardsweb
Well-known member
Here are a couple pictures of my latest chip amp based on the LM3886.
My LM3886TF weekend project
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Very cool.
It's funny how these days, the majority of the weight and parts count is in the power supply. Nice toroid there.
That's a nice box, where did you get it from?
It's funny how these days, the majority of the weight and parts count is in the power supply. Nice toroid there.
That's a nice box, where did you get it from?
Jimna
Well-known member
yes very cool! whats the specs?
Wardsweb
Well-known member
The case (ATI-738U) I bought back in 2007 from ATI Research. It had just been sitting, so I decided to use it.
The National Semiconductor LM3886TF is capable of 68 watts. I'm under driving it so I get about 50 watts per channel.
The amp has plenty of heft to drive even non-efficient speakers. The highs are very crisp. I've only got about 15 minutes on the amp, so it should only get better as things heat cycle a few times and the chips get a good burn in.
The National Semiconductor LM3886TF is capable of 68 watts. I'm under driving it so I get about 50 watts per channel.
The amp has plenty of heft to drive even non-efficient speakers. The highs are very crisp. I've only got about 15 minutes on the amp, so it should only get better as things heat cycle a few times and the chips get a good burn in.
Tj Bassi
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Very nice!
Some of the chip amps have excellent specs, and are even making their way into high-powered tube amps as driver stages.
http://www.electra-print.com/techblog.php?blogid=7
I am thinking about using one to drive my PP 304TL amplifier. In this case a single Pentawatt device can swing 130 volts on the output stage grids, all the way into A2 if you'd like.
Tj
Some of the chip amps have excellent specs, and are even making their way into high-powered tube amps as driver stages.
http://www.electra-print.com/techblog.php?blogid=7
I am thinking about using one to drive my PP 304TL amplifier. In this case a single Pentawatt device can swing 130 volts on the output stage grids, all the way into A2 if you'd like.
Tj
Bernard
Well-known member
Very nice indeed!
I am not a fan of anything with a power switch at the back, having lived for many years with a CDT and DAC that had power switches in it the back. I found it a major problem reaching round the back every time.
I am not a fan of anything with a power switch at the back, having lived for many years with a CDT and DAC that had power switches in it the back. I found it a major problem reaching round the back every time.
Shoot, they look like they're milled!
Wardsweb
Well-known member
You can buy the boards or a kit from chipamp.com The heatsinks I picked up on Ebay.
Here is my previous version based on the LM3875. I got these heat sinks also off Ebay.
Wardsweb
Well-known member
I don't use the chip amps that often in a permanent setup, but when I do, I power them via a 12VDC triggered relay (Parasound Scamp).
