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It is currently 20 Feb 2020, 09:11

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 Post subject: Slim Line 100W Class D
PostPosted: 04 Feb 2020, 13:56 
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Joined: 06 Jun 2008, 18:23
Posts: 5174
Location: Australia
This started as a 150W Class D amp, with hifimediy T3 Tripath modules in a 1U enclosure. But the amp had a quiet buzz I could not fix. I then changed it to a 25W single rail chip amp with passives on strip board. That didn’t play music though all voltages etc checked out.

I then saw on eBay a very small (about credit card size) 100W Class D module. And it’s only AU$20 delivered. It worked with the single rail 36V PS I had already made and looked squat enough to fit in the low 1U rack mount enclosure. The module is based on the TDA7498 chip and uses BTL technology. These enclosures are quite smart with an ash stipple finish, steel top, bottom plates and side brackets and Al back and front plates.

The finished amp is called “Image” and the name plate has been ordered. The module is rated 100W into 4 and 80W into 8ohms. Which means better than 70 clean watts before the usual 10% distortion stated with most Class D amps at full power.
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It sounds really excellent and drives my easy to drive Altec horns and 12” woofer well. Bass is very good and the rest of the frequency range appears well balanced. Plenty of power and would drive low sensitivity speakers with ease. Very happy and now I have my super slim line power amp, my own little Devailet which was the main reason I started this project in the first place.
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It doesn’t rival my Holton “Precision” amp with its extreme bass extension and control and sublime transparency but if you hadn’t heard the Holton amp you would never know what you are missing.


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Projects:”Image” - Low Profile 100W Class D amp | ”fiih” - 150W Holton inpsired power amp | "Precision" - 300W Class AB Holton power amp | ”Gothic” - FET Push-Pull headphone amp


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