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Chip Amps Amplifiers based on integrated circuits

Modulus-86  build thread
Modulus-86  build thread
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Old 14th February 2019, 10:54 PM   #4531
tomchr is offline tomchr  Canada
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Of the two, the THAT1206 will provide the best performance as it has slightly lower noise than the 1203.

Tom
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Modulus-86, 186, 286, 286 Kit, & 686: 40-240W (8Ω) at <-120dB THD. HP-1: 3W/20Ω, -130dB THD, 128dB DNR.
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Old Yesterday, 04:16 PM   #4532
Alesi is offline Alesi  Czech Republic
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Hi, today I finished my 2-channel modulus-86 build... well actually not finished, because I am missing THAT1206 (its on a way), so i at least wanted to try to connect RCA into the input of LME49720. So I hardwired it on top of R23 because that was very convenient place to solder it on (dont need filters just for testing...) The amplifier came life without any problems - and it plays... But I am not so pleased with sound. I am playing into Dali Ikon 2 speakers with good cables that vere tested on very good amplifiers so I know they sound great.

It sounds a little better then LM3886 alone, but the sound is actually a little unpleasant, stage is not bad, but the instruments are not divided as i expected them to be (and as they are on some otgher amplifiers), soudn is unpleasant on bigger volume (which is always good indication it is distorted in some way or another)...

So my question is - did i do something wrong elsewhere or is connecting rca straight into LME49720 just not good idea because ths happens?
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Old Yesterday, 09:18 PM   #4533
tomchr is offline tomchr  Canada
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R23 forms a lowpass filter with a capacitor. I think you're capacitively loading your signal source, which it probably doesn't appreciate very much.

I recommend that you build the circuit as designed before passing judgement.

Tom
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Modulus-86, 186, 286, 286 Kit, & 686: 40-240W (8Ω) at <-120dB THD. HP-1: 3W/20Ω, -130dB THD, 128dB DNR.
Neurochrome : : Audio - www.neurochrome.com - Engineering : : Done : : Right
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Old Yesterday, 09:26 PM   #4534
Alesi is offline Alesi  Czech Republic
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Well sure, I am.judging output of current connextion, nothing more. i was impatient and not sure what happened, now I know, thanks.
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