Aentons
Well-known member
Yep, this. Some people don't care about imposition.
Btw, could you come to my house and give me a foot massage. Thaaaaanksssss....
Stuff you wanted to know but were afraid to ask
- Thread starter spi
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Btw, could you come to my house and give me a foot massage. Thaaaaanksssss....
Brett
Well-known member
I used to get this when I owned a business. Did this once, don’t think they ever asked again:
Or when you're debugging a build with one...
F**k! Ahh! Crap!
>-/-8-O
CheapSuitG
Well-known member
The Stussy S! That is going on one of my next builds!
rwl
Well-known member
How should I read symbols on a schematic, where no pin is specified, the symbol appears symmetrical, but directionality is important for pins? In particular, I'm wondering about pots and JFETs. Here's some example pots to show what I mean:
PPCB schematics, and other more recent ones I've seen, will specify the pins pretty clearly. In the first case I'm pretty sure it's pin 3 at the top and 1 at the bottom, since that seems standard for volume. But I'm wondering more generally.
And here's the JFET:
My understanding is that for JFETs the drain and the source can mostly be used interchangeably, so I suppose from a schematic perspective there's no difference. But for transistors where pin 1 is drain and pin 2 is source, you can't easily convert the schematic to a PCB without some pin wrangling.
Am I missing something?
PPCB schematics, and other more recent ones I've seen, will specify the pins pretty clearly. In the first case I'm pretty sure it's pin 3 at the top and 1 at the bottom, since that seems standard for volume. But I'm wondering more generally.
And here's the JFET:
My understanding is that for JFETs the drain and the source can mostly be used interchangeably, so I suppose from a schematic perspective there's no difference. But for transistors where pin 1 is drain and pin 2 is source, you can't easily convert the schematic to a PCB without some pin wrangling.
Am I missing something?
cdwillis
Well-known member
I don't know that there is or was a standardized way of specifying which leg is which on a potentiometer on a schematic. If you know how the pot behaves either increasing or decreasing resistance you can figure it out (using legs 1 to 2 increases resistance, using lugs 2 to 3 decreases resistance). Legs get jumpered so that if the wiper fails the circuit can still function somewhat as if the pot is just a jumper on that portion of the circuit. On something like that speed control you'd have to know whether increasing speed would mean increasing the pots resistance or not.
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