Ramsey UAM2 digital amp - anyone know anything about it? - diyAudio
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Old 29th March 2005, 01:09 PM   #1
KT is offline KT  United States
diyAudio Member
Join Date: Oct 2003
Location: USA
Default Ramsey UAM2 digital amp - anyone know anything about it?

Here's an interesting little thing I found on Amazon. I don't know anything about it, but I thought I'd ask in case anyone does.


It's a digital amp, but I can't tell what kind of chip it uses.

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Old 29th March 2005, 01:22 PM   #2
KT is offline KT  United States
diyAudio Member
Join Date: Oct 2003
Location: USA
Here's a direct link to the amp on Ramsey Electronics:


It kind of reminds me of that LM1875 kit that's out there. It was basically a board and parts kit based on the LM1875 datasheet circuit, but didn't seem to make a big splash in the Gainclone community.

I wonder if this digital amp kit is the same, or if it's really something better.

Anyhow, it looks like only one channel and costs just as much or more that a new Sonic Impact 5066.

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Old 29th March 2005, 10:27 PM   #3
jkeny is offline jkeny  Ireland
Join Date: Feb 2007
Location: Dublin
According to UAM2 manual - it uses a 20W "Mono, High Power, Filter-Free Class-D Audio Amplifier" Texas Instruments TPA3001D1 chip

Evaluation board (fully assembled) can be bought from TI for $49 - seems like a better deal (all the soldering of SMT parts already done)

This is a so called "filterless" class D chip - no need for large output inductors because the module is meant to sit close to the speaker - short speaker leads= low EMI emissions?

Has anybody any ideas on how effective filterless class D chips are - after all a major source of distortion is supposedly eliminated/reduced i.e output inductors

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Old 13th April 2006, 10:52 PM   #4
diyAudio Member
Join Date: Apr 2005
Location: woodlands, tx
Default UAM2

It is a good place to start classD cold. Worked perfectly as advertised. It could use an output filter though. Generated a *LOT* of emi.

fyi: evaluating <20w stereo classD for portable music instrument amps.

I've also ordered the new Maxim eval board. ( includes output filter)
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