Svart
Well-known member
yeah feedback is somewhere between 10k-18k, I settled on 15k. 15pf could easily come from your layout and axial parts..
tk@halmi said:[quote author="Svart"]SMOKE! ...turns out the schematic doesn't match the numbers on the boards.
on the schematic D1 is really D3 on the board, D2 is really D4, D3/4 is really D1, and D5/6 are really D2.
turns out the biasing for Q5 was screwed up because of this so a few parts changes should get these boards working again.
:thumb:
tonedude said:Going to build my own Bloaks on breadboard using this schematic http://skipwave.net/images/bigfetbloak_v2.pdf and are about to source parts:
BC560 and 550 are easy to find at my favorite swedish dealer (electrokit...) but...
Is it possible to use:
- MJE340/350 as substitutes for MJE800/700 (http://www.fairchildsemi.com/ds/MJ/MJE350.pdf)
The GR and BL are graded for IDSS or on current when 0Vgs. The GR is 2.6-6.5mA is lower current but will probably work Ok since most JFET circuits use source resistors and/or don't run at 0Vgs.- 2SK170GR as subs for 2SK170BL (http://datasheet.octopart.com/2SK170GR-Toshiba-datasheet-101287.pdf)
The in914 should be no problem. I don't know what a 914b even means... most small signal diodes are pretty much interchangeable.
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