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ang728

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Everything posted by ang728

  1. CFA Boards are coming,will report back after my build is completed ! BTW,how much current per channel is balanced CFA needed?
  2. THIS http://gilmore.chem.northwestern.edu/ubaltobald.pdf Original Post at here:
  3. The J1 placed in the middle of uber3 ubal to bal. Thanks ! now I can comfortably share +/- 24V supply with CFA2
  4. Finally decided switching to Uber3+CFA2 set. got some question for uber3 what is the use for J1 Jumper and can we apply +-24V directly to uber3? thanks
  5. OK Thanks ,I will consider it but how much should the bias be?I read 150mV across 1Ohm somewhere,is that right ?
  6. HI All,apolgize for my english first I'm planning to build a CFA3, but when reading gerber layout , http://i.imgur.com/T2QaX1X.jpg I see silkscreen prints " GAIN=10K SS,1.5K ZF Input=5K SS,100 ZF " and also noticed SS,ZF marked on silkscreen.I assumed ZF is for Zero Feedback and SS for Super Symmetry but not so sure whay they actually mean.so asking what are they mean and how to adjust them if needed to. Another question is about bias.it seems to be measured by 1Ohm and adjusted by 5K pot,but how much bias is appropriate? Thanks
  7. I used OPA445BMs on my build ,I think single OPAmps can run unity-gain stable should work fine
  8. I think japanese made R-core would be better Kitamura Kiden (北村機電) http://kitamura-kiden.co.jp/
  9. My Build, LCD Display and Control board is designed by Hong Kong DIYer "Kevinyip". But I didn't use onboard reciver,RS232 and display only Source inputs are connected from backplane which I bought from TAOBAO
  10. 1N4007 is for protection as shown below, 1N4002 would be better if you only have 4001 and 4002 LED between + - rails can be power indicator and simple load to help discharging caps.
  11. Thanks! besides not as "hi gain" as I thought , actually they work well .Love that sound with switch on btw,I am curious about how does this feedback design work in the circuit , any paper or keywords that I can learn from ?
  12. finally finished the build with some sp style wiring
  13. same question here,is there any reason to use tantalum caps at certain places like C8、C13 instead of electrolytic or ceramic caps ?
  14. congrats,would like to see the finished build !
  15. what value of input pot should be used on squarewave klone? read 10K somewhere before but I can't find it or maybe should use higer value like 50K/100K since it's fet input? thanks
  16. interested in 4-gang alpha pots 3RP/2142G-XA1 anyone knows where can I get it?
  17. oops , seems some misread on me I thought that kevin is going to draw an off board version of goldrefrence regulator it would be nice if using case with heatsink on bothsides or just case itself
  18. I am planning to get a Philips BDM4065UC 4K@60hz VA Panel looks decent
  19. didn't notice at all , almost invisible now patching
  20. yes he can do international shipping can contact him by mail
  21. A Taiwanese kit & film cap supplier called ucc http://ucccap.myweb.hinet.net/ mine is older version
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