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Skooby

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About Skooby

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  1. KG Balanced Dynahi build discussion thread

    55C sounds about right (forgot what was my bias). My Dynahi runs at about the same temp after 30 min (measured via an IR-based meter, a few degs off here and there is not a big deal). Have you checked with Steve about where he got his tranny shieldings? I run with Anteks and they seem to shield adequately. Single-box saves quite a bit of space; if run two boxes, do consider umbilical resistance.
  2. The Multi Amp aka Dynalo Mk2

    Nice rework station! The price is pretty reasonable too, should have known about it six months back (when i bought my rework station). Any recommendation on desolder gun? Hakko fr300/301 any good?
  3. The Multi Amp aka Dynalo Mk2

    My hat's off to those who managed to solder on the qfn's. On my latest boards, could only solder the positive qfns, gave up on the negative. Will try to-220 tps7a3301 on the boards from the current GB.
  4. The Multi Amp aka Dynalo Mk2

    Well, if you can get the heat sinks to transfer some heat to the chassis (shimming extra metals on top the sink so it can get touch the chassis top), doubt that the heat in the channels would be a problem. My Mini's temp is about 32C with help from the chassis to dissipate the heat; without the chassis help, it was well above 50C. I didn't do any hole into my sinks. I see you didn't attempt QFN solderings with your new re-flow gun?
  5. 2018 PCB Group Buy with TKD pots

    Cheaper than WE300B reissued ! JAC Music got a pair for ~500usd, still pretty steep for a set of four.
  6. 2018 PCB Group Buy with TKD pots

    CFP2 is CFA (current feedback amp), right? Much different from Dynahi? I already have the Dynahi, wonder if it would be just a duplicate to build the CFP2.
  7. Part Sourcing Assistance/Advice Thread

    I got Sparkfun 303d station. Not the cheapest but the air pump in the base is better than in the gun, i think. Did all my smd's with it. Ebay got lots of choices but not sure which will support parts, warranty, complaints, etc.
  8. The Multi Amp aka Dynalo Mk2

    Good job on the QFN soldering! For some reasons, couldn't get the negative to work. I reflow so many times that I thinked may burn thru the regulators.
  9. KGSSHV Carbon Build Thread

    I like 009 more than 007MkII out of the Carbon. To me, worth the $$$. May be get a chance to listen to both before commit buying anything?
  10. KGSSHV Carbon Build Thread

    Check Trendsetter, this was where I got mine.
  11. The ultimate DIY? A Stax SRM-T2!

    Thanks for this head-up... "Coil supply" = filament AC supply? Keep all filament supplies floated, no ground connection/leave center tap open? Wonder it's worth to swap 78xx/79xx with TPS7A470x/330x?
  12. The Menace

    I've copied BH zener regulated PS to use for a DTH 45 (ignore the B+ delay/FDA217, I got an unpleasant thump).
  13. The ultimate DIY? A Stax SRM-T2!

    Are these valid DIY T2 tranny specs? 30-0-30/500mA, 2x6.3V/1.5A, 2x6.3V/4.5A Two of 485V/150mA, 285V/60mA, 75V/60mA Thanks!
  14. Balanced to unbalanced board

    Try: https://drive.google.com/drive/folders/0B_iJFfZStuVhSE5nOHBVdTByR1k?usp=sharing https://drive.google.com/drive/folders/0B7egryukiT7_TFlEQlBRejdVdDQ Kevin retired.
  15. Balanced to unbalanced board

    I took a stab at Mouser BOMs for the diamond_buffer and unbal_2_bal SMD boards. Can someone kindly enough to check and correct the BOMs? Many thanks! **** Edit **** The below lists hadd these changes (thanks to mypasswordis!): LED from 2V to 1.9V 300-Ohm LED resistors from 250-Ohm 0.1uf C2/C3/C7/C8 caps to 0603 package 10uF C1/C4 to X7R Other note: OP27G U1/U2 can be changed to other op-amp ************** Unbal_2_bal SMD Mouser # Description Order Qty. 757-2SC3324BLTE85LF Bipolar Transistors - BJT Audio Freq Low Audio Freq Low 7 757-2SA1312BLTE85LF Bipolar Transistors - BJT PNP Trans -0.1A LN -120V VCEO 7 284-APC1206B1K00N Thin Film Resistors - SMD 1KOhm 0.1% 1206 25 PPM 4 667-ERA-8AEB103V Thin Film Resistors - SMD 1206 10Kohm 0.1% 25ppm 12 667-ERA-8AEB132V Thin Film Resistors - SMD 1206 1.3Kohm 0.1% 25ppm 2 647-UWX1E101MCL1 Aluminum Electrolytic Capacitors - SMD 25volts 100uF 8x5.4 20% 2 584-OP27GSZ-R Precision Amplifiers LOW-NOISE PREC IC 2.8V/uS 2 581-06033C104K4T4A Multilayer Ceramic Capacitors MLCC - SMD/SMT 25V .1uF X7R 4 710-885012209028 Multilayer Ceramic Capacitors MLCC - SMD/SMT 2 710-150120SS75000 Standard LEDs - SMD WL-SMCW SMDMono TpVw Waterclr 1206 4 603-RT1206BRD07300RL Thin Film Resistors - SMD 1/4W 300 ohm .1% 25ppm 6 Diamond_buffer SMD Mouser # Description Order Qty. 649-68016-404HLF Headers & Wire Housings 4POS R/A HDR SnPb 1 279-CPF1206B10RE1 Thin Film Resistors - SMD CPF 1206 10R 0.1% 25PPM 1K RL 4 279-CPF1206B24R9E1 Thin Film Resistors - SMD CPF 1206 24R9 0.1% 25PPM 1K RL 2 756-PCF1206R-20KBT1 Thin Film Resistors - SMD .125W 20K ohm 0.1% 25ppm 1 757-2SC3324BLTE85LF Bipolar Transistors - BJT Audio Freq Low Audio Freq Low 4 757-2SA1312BLTE85LF Bipolar Transistors - BJT PNP Trans -0.1A LN -120V VCEO 4 710-150120SS75000 Standard LEDs - SMD WL-SMCW SMDMono TpVw Waterclr 1206 2 603-RT1206BRD07300RL Thin Film Resistors - SMD 1/4W 300 ohm .1% 25ppm 6
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