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DIY Novo problem
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Kevb View Drop Down
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    Posted: 22 Feb 2022 at 12:12pm
Hi Gents
My lock-down project was to build myself the DIY version of the NOVO headphone amp. I have enjoyed listening to wide sound-stage and clarity this extraordinary amp brings. One issue though - I hear a what i can only describe as a "flutter" noise on one channel when not playing music. The volume doesn't increase with the volume control, but can decrease if I extend the headphone lead to full length!. I have tried other headphones and plugging / unplugging interconnects - but without success. Any ideas please?
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Fatmangolf View Drop Down
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Points: 7410 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Fatmangolf Quote  Post ReplyReply Direct Link To This Post Posted: 22 Feb 2022 at 7:47pm
Thanks Kev. I would disconnect it from the PSU and use a soldering iron to reflow the various junctions on the circuit board i.e. just enough heat to melt them and left them cool. Graham or John may uhave more specific advice and a better solution.
Jon

Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC.
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Ash View Drop Down
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Points: 3886 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ash Quote  Post ReplyReply Direct Link To This Post Posted: 22 Feb 2022 at 7:54pm
Sounds like the lead is acting as an aerial. EM inductance?
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Fatmangolf View Drop Down
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Points: 7410 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Fatmangolf Quote  Post ReplyReply Direct Link To This Post Posted: 22 Feb 2022 at 7:56pm
Dry joint was my first thought hence the reflow.
Jon

Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC.
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Ash View Drop Down
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Points: 3886 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ash Quote  Post ReplyReply Direct Link To This Post Posted: 22 Feb 2022 at 8:44pm
My previous suggestion can't be correct otherwise both channels would be affected.
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Kevb View Drop Down
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Points: 4 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Kevb Quote  Post ReplyReply Direct Link To This Post Posted: 23 Feb 2022 at 10:18am
Thanks for the responses Gents. By re-soldering the junction John- do you mean have a go at all the components joints?
Thanks once again
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Points: 12974 		Post Options Post Options   Thanks (1) Thanks(1)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 23 Feb 2022 at 11:32am
If you have a jeweller's eye-glass inspect every soldered joint. Should any of the ceramic (and possibly the two small blue boxed) capacitors be "dry jointed" they won't do their job of providing stability - an unstable amp goes to RF interference - it oscillates like a radio receiver. If a stability capacitor were to be "left out" of a power amplifier that channel would be burnt to a crisp by now.

The trouble with electronics kits is, unless you're an knowledgeable electronics enthusiast, when things go wrong, it's where to start. From that point of view, I hate selling kits, although I'm always being asked to do them. The reason for there not being many audio kit manufacturers is twofold: 1. poor demand due to lack of interest in electronics, and 2. any profit they made was consumed in correcting constructor error. Both lead to insolvency.
Not simple enough for Google-Bot to understand...
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