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Everything posted by Pars
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So... my Windoze machine (new in June) is screwing up on OneDrive stuff. IT wanted to give me a Macbook Pro instead. Since I've been a Mac user since the '80s, I was game, until I discovered that Macs don't deal with OLE embedded docs well. No go on embedded pdfs or ppt or anything other than Word or Excel. WTF? Disappointing, but since I really need that at work, so no go on the Mac. Shit. Is this MS or Adobe, or both on this?
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Been watching the series version of Hanna. With Miriele Enos and Joel Kinnaman from The Killing, etc. Pretty good so far. Kind of followed the movie somewhat the first 3 or 4 episodes some. I'm enjoying it, but I also liked the movie.
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So not a standard blinking on the Panny? We bought ours (42") from my brother, and within a years it conked out with 10 blinks. Looking it up, other than the surface mount soldering, it amount to replacing 2 ICs on daughter boards (8 pin) and removing a tiny ceramic cap on each and replacing with an electro. They even sold kits for this. Been working great ever since (5+ years), but with the amount my wife leaves it on, etc., only a matter of time.
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I guess no one mentioned it, but the MPSA42 is the same as the KSP42. Mouser has 14,000 in stock (Central Semi).
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^ Holy shit! RIP Charlie...
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The caps are probably 160V. I've used 1/4W resistors as well. I wouldn't think there would be any current going thru these, but haven't measured or calculated it.
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Those were a snubber based on a post in 2010? by John Swenson on diyaudio. There has since been much more work done on these. See this thread: https://www.diyaudio.com/forums/power-supplies/243100-simple-math-transformer-snubber-using-quasimodo-test-jig.html Sorry, it is long. For the combo recommended as a swag by Swenson, I had some MKP1837 22nf caps laying around, and just used crap Radioshack carbon 330R resistors.
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I'd agree, just from listening, and not the Stones. Led Zeppelin. Even though LZ 1 was one of the first records I bought, I didn't have any copies of any LZ, so decided to wade in. Looked at SH forum for some info, but the originals aren't bad (target discs), the mid 90's remasters suck, and the 2000's remasters are pretty good. Haven't decided whether I like the original or 2000s better yet.
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You need to get a more suitable solder iron, and I would invest in a solder sucker as well, such as an Edsyn Soldapullt or something like that. I'm not sure where you got your board from, but on any of the HC boards, I've never even come close to lifting a pad. Same with 1oz boards from seeedstudio, etc. Also, if you are using lead-free solder, one word: DON'T
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Thanks for that Ric! I hadn't seen that video before, and agree with what is said in it. Mahler has always been one of my favorites, particularly the 2nd, 3rd and 8th. My favorite 8th recording is the 1971 Solti/CSO recording, but I haven't listened to some of the more recent ones. I will say I have not been a fan in particular of MTT/SFO Mahler works as I find some of his tempi off-putting. I saw MTT conduct the 2nd in Chicago with the CSO, and found portions of it ghastly, though the mezzo-soprano Lorraine Hunt Lieberson (RIP) performed the best 4th movement (Urlicht) I've ever heard. I bought the SFO recording solely because she sang on it.
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Regarding the MJW21194/21193s: I believe some people use 2SC5200/2SA1943 instead of these. A bit lower power, but would be fine for a Dynalo. I think the pinout is the same, but I would check it first.
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I've been watching !00 Foot Wave, a mini-series documentary about surfer Garrett McNamara on HBO. Pretty good and engaging. https://www.hbo.com/100-foot-wave
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and now for something completely different part 3
Pars replied to kevin gilmore's topic in Do It Yourself
Most use the Wima -
I think that 10M90S is for the bias voltage. I assume it doesn't get that hot, but don't know the actual reason for the on board heatsink instead of sinking it to the main heatsink/bracket. It does look like there is sufficient board real estate available to have done that instead. EDIT: Kevin beat me to it while typing; go with his explanation.
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You could try replacing the opamp. Maybe something is wrong with that servo? Your other headphone amps could very well be ac coupled (cap on the input), so would not be effected by dc offset on the source. Is the dc offset you mention with a DAC connected and powered up? You might take a look at that.
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I use JFETs, which to me sound markedly superior to bipolars in the front end. I'm not so sure your problem lies with the front end. Is the scratchiness there noise there without changing volume, etc.? What are you using for a volume pot? Does the source feeding this have any dc offset present? As a dc coupled amp, it will not like that, and will amplify any dc offset present on the input.
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In the US, NAC has the LSK389B in the TO71 for $7.12 ea.
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The reference voltage of 10V comes from the Linear Technology LT1021DCN8-10#PBF. You normally won't need to measure this unless you have problems with the output voltage. You don't need to worry about transistor or diode matching on these. If you like, use 0.1% low tempco resistors for the R7-R10. You will get acceptable +/- voltage tightness with 1% resistors, particularly if you match those. No. Just use the specified Wimas with the 220uf Panasonic electrolytics and you will be good. Do not buy that cap from Partsconnexion and ignore all the audiophool bullshit. I never test these loaded, and I don't think you need a variac, particularly if you pay attention when building (right part in right place, etc.). I've never used a variac with a GRLV even though I have one. Just make sure you have your desired +/- 20V before connecting an amp board, and you should be fine. DItto.
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James, all: Nice writeup BTW. Correct me if I'm wrong, but I believe you can use a dual secondary transformer as a CT simply by tieing the two secondaries together? http://engineering.electrical-equipment.org/wp-content/uploads/2013/07/Dual-Voltage-Transformers-1.jpg All of the GRLVs that I have built use dual secondary transformers and dual bridges, and I don't foresee a reason to use the single bridge for one.