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Skooby

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About Skooby

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  1. 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.
  2. 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.
  3. 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.
  4. 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?
  5. KGSSHV Carbon Build Thread

    Check Trendsetter, this was where I got mine.
  6. 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?
  7. 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).
  8. 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!
  9. 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.
  10. 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
  11. Soldering station recommendation

    Another vote for FX-888. Got all functions I ever need in a solder. Did some smd with the standard tip, tough but not impossible. Still going strong, 6 yrs 'n counting...
  12. The ultimate DIY? A Stax SRM-T2!

    I'm up for some 2SC33810-BL, Justin! Hook me up, pleaseee...
  13. DIY Stax SRM-T2 Chassis Group Buy

    It would be nice to also have 5.0VAC tap-offs from the 6.3VAC filaments on LV trafo for future 20B usage...
  14. The Multi Amp aka Dynalo Mk2

    That's one fine soldering work on the QNF chip, sir! Ruined two boards, getting 3rd and 4th boards for another attempts. Damnit, this ain't rocket science! (*** if you can't get the QFN on. No sweat, just get the AMB Lab off-board/pre-soldered regulators! ***) My problem is getting just the "right amount" of solder on pins and pad.
  15. stax mafia circuit boards

    Congrats, Dr Gilmore!
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