Hi, I have an Amp 1 which I bought from 41hz.com and built some time ago. It's still going strong but I wanted to run a subwoofer from the board and can't find my original schematics. I seem to remeber that there was a pin on the chip to which you could hook up a sub from. Does anyone have any info that might help?
Hello,
I built an AMP1-b long time ago. If I am not wrong, the implementation of 41Hz was not far from tripath datasheet of TA2022 and its evaluation board:
http://e-ele.net/DataSheet/TA2022.pdf
On the webarchive, you can find this page:
41Hz audio. Sounds good to me!
confirming that it should be similar to the tripath evaluation board of TA2022.
From my side, I found the "assembly instructions" of amp1-b that was an evolution with the output relay:
AI_AMP1-B.pdf - Google Drive
Here I found a sheet with all the 41hz amps info:
41Hz Kit Information - Google Sheets
I hope it helps.
I built an AMP1-b long time ago. If I am not wrong, the implementation of 41Hz was not far from tripath datasheet of TA2022 and its evaluation board:
http://e-ele.net/DataSheet/TA2022.pdf
On the webarchive, you can find this page:
41Hz audio. Sounds good to me!
confirming that it should be similar to the tripath evaluation board of TA2022.
From my side, I found the "assembly instructions" of amp1-b that was an evolution with the output relay:
AI_AMP1-B.pdf - Google Drive
Here I found a sheet with all the 41hz amps info:
41Hz Kit Information - Google Sheets
I hope it helps.
Found the original build intructions but no mention of an output pin to conenct a sub =, Must have imagined it... https://www.classdaudio.tk/doc/ClassD/Amp2/ai_amp2t.PDF
What do you mean by that?
As far as I can understand you, you want to play everything below say 100Hz (sub application). But in any case, this is not task for amp, you will have to provide signal, that will not have anything >100Hz to the amp (any amp as a matter of fact). No matter if amp is full range, you can decide to use it for something that is less than full range
A lot of the ClassD amp boards you see for sale on a popular auction site have a line level out socket designated for Subwoofer, which is fine if the sub you intend to use has the required on-board controls for roll-off, phase, and crossover setting, often between 30Hz and 150Hz or similar.
I didn't realise that these kits required soldering of all the SMD devices. Many years ago I made a small digital up-sampler board with many SMD caps and resistors. A complete nightmare. Some of them were no bigger than a grain of black pepper!
I assumed that I had killed the thing as when I connected it up to my Dac, all I got was a crackly white noise mush. Put it aside until years later when I was clearing out and about to bin it. Gave it another try with a Dac and bingo...it worked. The difference...the newer Dac ouput a 96Khz digital signal which is of course what the up-sampler needed, not 44.1😀
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