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Posts by wakibaki

LTC3260 looks like an interesting device. No sooner will it be built into an audio device than it will be found to be 'audible' in some detrimental manner. To avoid criticism in some quarters, you should take care that any USB device you design is carefully thought out to exclude any noise from the PC or other host device, particularly on the power lines, and prevent it passing through, as this is often held to be a cause of degraded sound quality in USB devices. Since...
What is audible is subject to constant dispute. There is a lot of discomfort about switching power supplies. It depends anyway on the PSRR of whatever the other circuits are. Anecdotes abound about problems with USB power. You can build it and measure it or listen to it. If it looks OK measured using your soundcard as input, or if you simply think it sounds OK, then use it. w
IMO the only people who are worrying about type of solder are those with the luxury of not having any serious design choices to make. w
This is my second toaster oven, I bought the first for a place I worked at, everything was done on a shoestring.While I think it's admirable in a way to try to mimic the profiling of a professional oven, I think it's a wasted effort for amateur use. I've had no problems I could attribute to a poor temperature profile. Industrial use is a bit different from amateur. Thousands of boards per hour may be being processed, and a run of defects can be very expensive. No-one wants...
Cheaper than a soldering iron:- http://www.ebay.co.uk/itm/Toaster-Mini-Oven-1000W-9-Lite-Oven-Broil-Bake-Toast-FREE-Baking-Tray-More-/271077604952?pt=UK_HGKitchen_SmallApp_RL&hash=item3f1d7bfe58 Obviously this eBay is not local to you, but you should be able to find one or arrange postage. I make brass solder stencils by etching. I use toner transfer to mask the brass. The process is very forgiving. The solder paste can be quite ill-defined and still succeed because of...
Done a few designs with this chip... http://www.head-fi.org/t/555770/what-i-did-with-tpa6120 http://www.head-fi.org/t/586042/what-i-did-next-with-texas-headamp-chip-a-digital-control-desktop-portable You can see quite a large hand wound inductor I used at the output, I also built it with a 1Meg ferrite, I had no problems with oscillation in either case (or without). The amps looked good tested with RMAA, but it's not possible to verify the performance absolutely without...
From the description the chances are that that is exactly what it is. Other possible problems are dry or broken solder joints in the wiring associated with the volume pot. Since the problem changes with movement of the control, the chances are that the problems are being caused by some kind of mechanical problem in or close to the pot. Of course it's not a definitive diagnosis, but I would think that inspecting the joints near the pot and replacing it if nothing is found...
Here is my take on the issue. Dimensioning a tube amp for headphones is problematic if a wide range of phones is to be accommodated. Headphones range from 16 to 600 ohms and perhaps beyond. They have a wide range of efficiencies. You can discover these easily. An amplifier capable of 8vrms and 250mA should be capable of driving the large majority of phones and capable of destroying many. Dimensioning a SS headphone amp is straightforward. It must deliver sufficient...
This is a feature of the amplifier, not the headphones. You are running the risk of confusing the issue, when the guy clearly needs his understanding of the basic issue improved, not to be led into a minefield of secondary issues. A volume control divides noise equally with signal. The added noise after the volume control is trivial, recall Friis.w
I am an RC modeller too, but an external charger is not always what is wanted. You have found my TPA6120 amplifier. I have built 2 of these with protected li-ion batteries. One set of batteries has survived being left on continuous charge, but one set died, I don't know whether the batteries were at fault, or if the charger is wrongly adjusted. The batteries are from dealextreme.com, I buy them for my LED flashlights, I have had a few fail. Anyway, be careful if you use...
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