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ang728

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Posts posted by ang728

  1. Now for something different...

    in Do It Yourself

    Posted · Edited by ang728

     

    26 minutes ago, MLA said:

    What would the current draw be for a balanced version? Inside or outside GRLV range ( think I saw 1,5 amps somewhere)?

    I put them on lab bench psu before,can't remember what's exact number of current draw,but I'm sure under 1.5A

    then built a slimmer case version a while ago using orginal GR and works pretty well

  7. and now for something completely different part 3

    in Do It Yourself

    Posted · Edited by ang728

    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

  12. goldenreference low voltage power supply

    in Do It Yourself

    Posted

    Link the same as the previous?

     

    EDIT: Also, a couple of questions:

    1) The 1N4007 diodes are not shown in the schematic. Could I use 1N4001/4002 here (have them on hand)? I'll trace them out on the board to figure out where they are, unless they are in the updated schematic.

    2) The 2K resistors (R13/R14) and the LED between the + and - output: what is their purpose? I noticed that Kevin had not put the LED in, and others completed boards as well were missing these. A dummy load for testing?

    1N4007 is for protection as shown below, 1N4002 would be better if you only have 4001 and 4002

    RlNrQEm.png

     

    LED between + - rails can be power indicator and simple load to help discharging caps.

  13. Now for something different...

    in Do It Yourself

    Posted · Edited by ang728

    I like that one a lot!!  :)  I have a pile of these that I need to finish at some point as it is a really good amp. 

     

    Any troubles with that feedback switch? 

    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 ? :)

  16. KG Balanced Dynahi build discussion thread

    in Do It Yourself

    Posted

    Coming from 70 holes at the top and bottom only which running at a high 82 degrees C. I've drilled much more. Top and bottom now has total of  118 holes and the sides has total of 48 holes. Now the hottest transistor running at 65 degrees C. Pretty happy with that. It was lot of drilling. I almost warped the top and bottom plates from the drilling.

     

    Now it's just a matter of resurfacing and repainting the case now. Cos lots of holes on stainles steel look like a cheese grater lols :)

    congrats,would like to  see the finished build !

  23. The Multi Amp aka Dynalo Mk2

    in Do It Yourself

    Posted

    if helps to have a bigass monitor. (32 inch, 2.5k)

    but its no longer enough, i need a 4k monitor thats about 40 inches

    for my desk. 60hz and the video card that goes with it.

    any suggestions?

     

    I am planning to get a Philips BDM4065UC

     

    4K@60hz VA Panel looks decent

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