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40W/8R not so dummy load for amplifier testing
40W/8R not so dummy load for amplifier testing
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Old 20th May 2018, 02:16 PM   #11
00940 is offline 00940  Belgium
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Ordered... about a month to wait to get the pcb. I just added a cap before the output buffer, in case of DC offset at the amplifier's output.

The eagle files and the gerber are in the attached zip. Order at your own risk at this point
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Old 7th June 2018, 08:59 PM   #12
00940 is offline 00940  Belgium
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The pcb arrived today, I populated the low level section. I've yet to solder the power resistors. Before doing it, I quickly ran a test in ARTA, on a focusrite 18i8. So that's just the opamp section, with a connection direct from "amp input" to "amp output".

Seems ok enough (the graph attached is at -10dbfs). I can get the thd+n a bit lower if the soundcard input is at -5dbfs but then thd goes up a bit. I'm going to redo the test on the juli@ tomorrow.

Btw, the performance of the 18i8 is ok at 1khz and 48khz sample rate. Things aren't that good at higher frequencies and sample rates. I'm curious to compare it to the juli@.
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