<whitequark> qu1j0t3: ##whitequark
<qu1j0t3> oh. i should be in there, i think.
<qu1j0t3> as a fan.
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<cr1901_modern> SolraBizna: Enchancement-mode, N-MOSFET requires positive gate voltage, enhancement P-MOSFET requires negative. >>
<cr1901_modern> For depletion mode, the channel that allows electrons to flow _already exists_ at 0 gate voltage, so you need to apply a voltage in the opposite direction to remove the channel
<sorear> MOSFETs are confusing because they're actually four-terminal devices, but nobody tells you this during the first year
<sorear> and you have to figure out what substrate bias is
<cr1901_modern> Yea, but you almost never care about it
<cr1901_modern> thus to turn off a depletion mode N-type, apply a negative voltage. To turn off a depletion mode P-type, apply a positive voltage.
<cr1901_modern> N-type depletion mode has a cool property where if you tie gate and source together, and attach the drain to a voltage source, you get a pullup "resistor" without using a resistor (drain == source voltage also removes the channel)
<sorear> and then there's a different combination of ties that gives you a current regulator
<cr1901_modern> I've thought NMOS pullups typically operated in the linear (ohmic) region. Based on this I-V curve, it looks like they operate in cutoff (Vds = 0) and saturation (Vds = around 5), just like their enhancement mode counterparts (which are used as switches to implement digital logic functions)
<cr1901_modern> https://www.electronics-tutorials.ws/transistor/tran_6.html For the curious- I wanted to see IV curves
<Bob_Dole> what's the best PCB prototyping places? might need to consider pcb thickness for card-edge stuff at some point in the future
<Zorix> i heard good things about oshpark, jlcpcb, pcbway, pcbcart
<Zorix> im going to try jlcpcb due to cost
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<TD-Linux> most card edge connectors use standard thickness pcbs
<Bob_Dole> some I was looking at were a different thickness from oshpark's standard, but seeed offered it
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<Bob_Dole> SolraBizna, TD-Linux here is doing 68k things.
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