The LJM modules here are a a class AB BJT design based on Doug Self "blameless" topology, however are a unique design fine tuned by LJM using AP instrumentation.
LJM MX50SE
First is...
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DIY Amplifiers - LJM modules
Here's a few things I've build recently, using mostly parts from AliExpress.
The LJM modules here are a a class AB BJT design based on Doug Self "blameless" topology, however are a unique design fine tuned by LJM using AP instrumentation.
LJM MX50SE
First is... -
This Melodavid Tweeter Let Me Down
AliExpress Brand Melodavid has been some of the highest value tweeters I've tested. I've tested several of the large "full size" models which all were top notch performers. Be28, CB25, CM25Nd, D28S.
I decided to splurge on a "Illuminator homage". Specifically, it's a... -
J-Box III Review
The J-Box III Review
The J-box is a device that I’ve often looked at on AliExpress, but I don’t see much or any talk about it really on DIY forums, not English speaking ones anyway. It looked quite interesting to me as an all-in-one measurement system; the poor man’s alternative to...Last edited by Reet; 18 May 2025, 13:02 Sunday. -
The best tweeter I've tested yet...
...came from AliExpress. "Best" is a subjective of course, as I have others that do better <2kHz. But >2kHz this is of the lowest 3rd harmonic I've seen, and the lowest over a wide frequency range of anything on my shelf. Tested at 2.8V, I did test again at +5dB (~5V), 2nd order went...