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Old 2nd June 2013, 03:57 PM   #1
diyAudio Member
Join Date: Oct 2010
Unhappy Tripath 2021b with preamp. help!

Hey all DIY people.

I dont know if this has been up befor, but i apologize if so.

Sum up: -Basically i'm asking about the maximum input levels for a tripath based amp?-

I have a smsl sa-s3 tripath amp. it's based on the 2021b chip.
I am generally very impressed, but since i need to use it with a wide variation of mp3 players, ipods and smartphones, the sound is not always loud enough.
I believe this is due to the low output signals from the devices, rather than the amp itself.

My solution was to build this pre amp to boost those output signals:
JFET iPod preamplifier

when i completed it, I measured about 350% gain of the signal. Maybe a little high, but i tried it out. unfortunately it fried the amp pretty fast.

Now i'm waiting for a new amp to replace the old one. i adjusted the preamp so the gain is down to 200% now. but i'm a little nervous that it's still too high.?

So basically i'm asking about the maximum input levels for a tripath based amp?

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Old 3rd June 2013, 03:51 PM   #2
Minion is offline Minion  Canada
diyAudio Member
Join Date: May 2006
Location: Cowican Bay , vancouver island
Well , I don't know about your specific Class-D amp but most amps are built to handle a Line Level signal which is generally 0.7v to 1v .....
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Old 7th June 2013, 10:19 AM   #3
a3aan92 is offline a3aan92  Belgium
diyAudio Member
Join Date: May 2013
This issue has been talked about alot in the 'Boominator' topic. Either lower the input resistance or if you don't want to modify the amp you can simply use a pre-amp. Portable headphone amps can do the job, for example the FiiO E6.
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