Posts filed under: DIY Audio

First, I need to say sorry because I haven’t updated this blog for quite some time. Crazy busy with my daily office life. I have some good stuff on hand, but unfortunately don’t have much time to take picture and...
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This is one of the measurement device that has been on my list for a while, it’s HP/Agilent 8903B distortion meter (well, Tektronix AA501 is also on my list). It’s a solid unit with combination of low distortion oscillator and...
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In order to have better view (and better understanding) of how stuff works, especially in audio, I need to have more testing equipments. Unfortunately, those are quite expensive for a person who is doing this as hobby – like me....
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It’s time to replace battery on some of my measurement device. And surprisingly, it’s not easy to find good (and safe) replacement. For some of you who never (I hope really-really never) got problem with battery, probably you will not...
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Long time no post. Quite a busy months. Let’s start with a simple one. All photos were taken with my Nokia Lumia 1020. I was too lazy to use my DSLR for this purpose ;-). During some ‘cleaning house’ session...
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This is quite common tube, 300B by Shuguang. Nothing really special, only white ceramic tube socket, gold plated pins, and carbonized nickel plate. Let’s see how interesting this tube when the filament is powered. The perforated design is interesting than...
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A bit tough later these days to find a good reclock module. Somehow, I was interested to try this one: TCXO Module from D/A Mental (a bit strange name, huh?). The specification is quite promising, like below: Frequency : 22.5792MHz...
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After first part here, I think it’s time to experiment more with this SPDIF Transformer. What could be worst than potting it into a custom enclosure? Nanana, I can’t even imagine… Below is the final result: The potted transformer vs...
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Scientific Conversion SPDIF Transformer is quite unique. The appearance is 8-pins SMD, but the footprint is nowhere on the 8-pins SMD one. I have tried BrownDog PCB to mount, but it just doesn’t fit (or I pick wrong PCB). But...
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It has been quite some time since my last article on this blog. Quite a busy life (but that busy life pays this hobby, anyway). I tried to spend sometime few days ago to disassembly QLS QA-660 and planned some...
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I have used several good brands of potentiometer. But once upon a time, I decided to stick with stepped attenuator. My first was DACT which using SMD resistor and configured in series. They were factory made, so just paid and...
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Living in such humid country, then corrosion is always around. I hate it, frankly speaking. But no choice 😉 I try to ignore such corrosion (and throw away my ‘perfectionist’ habit), but when it comes to my DACT Stepped Attenuator,...
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