Correct orientation of JFET in Six String Stinger
- Thread starter claudio
- Start date
thesmokingman
Paid Hater
when in doubt, break out the continuity tester and correlate the pads on the pcb with the pads on the jfet breakout boards. and if you're contemplating replying that you don't have a continuity tester or don't know how to use one then you should probably fix that rather than waste your time and mine.
bhcarpenter
Well-known member
@thesmokingman’s suggestion is a good one too, although phrased a bit surlier than necessary 
.
Pretty much any DMM will do for continuity testing. If it doesn’t have a dedicated continuity mode, set it to measure resistance. Pads that are connected should read close to 0 ohms.
.Pretty much any DMM will do for continuity testing. If it doesn’t have a dedicated continuity mode, set it to measure resistance. Pads that are connected should read close to 0 ohms.
thesmokingman
Paid Hater
oh it's necessary ... go count the "passes signal in bypass" troubleshooting threads and get back to me
https://www.mouser.de/datasheet/2/308/1/MMBFJ202_D-2316065.pdf
Looking at the sheet it actually looks like the transistor is tagged wrongly. D should be at the right and S at the left (when the pad side with the transistor is facing up). I checked with the multimeter, and the D on the pad has continuity with the D at the transistor, so we should consider that the D and S at the pad are also inverted. The question is what are the D and S at the PCB, so i can install it inverted.
Considering the PCB 's drawing seems to imply it wants the flat side of the transistor facing the footswitch, and in that case D would be at the left handside, I'd conclude I have to actually invert the pad. Am I wrong?
Looking at the sheet it actually looks like the transistor is tagged wrongly. D should be at the right and S at the left (when the pad side with the transistor is facing up). I checked with the multimeter, and the D on the pad has continuity with the D at the transistor, so we should consider that the D and S at the pad are also inverted. The question is what are the D and S at the PCB, so i can install it inverted.
Considering the PCB 's drawing seems to imply it wants the flat side of the transistor facing the footswitch, and in that case D would be at the left handside, I'd conclude I have to actually invert the pad. Am I wrong?
Curiously, https://forum.pedalpcb.com/threads/six-string-stinger.7608/ also shows pads with reversed D and S on the pad.
what do you mean? i check the continuity between the transistors and the smd pins.
ICTRock
Well-known member
let's take the opportunity to expand your ability to help yourself. product datasheets. http://www.experimentalistsanonymous.com/diy/Datasheets/J201.pdf
This includes pinouts for both package types. Also, those electrical characteristics further down the datasheet become important not only in circuit design but, more relevant around these parts, parts substitution.
Last edited:
ICTRock
Well-known member
if I can't introduce chaos then what's the point of all this?
I changed the link for the paint by numbers crowd
Last edited:
jwyles90
Well-known member
Building pedals has quite the steep learning curve. "Introducing chaos" for someone who's just trying to ask a question doesn't feel all that helpful
ICTRock
Well-known member
would you like a hug?
It Was a joke, no harm intended by ICTRock!
jwyles90
Well-known member
Well shoot, I guess I do need a hug then.
I'm curious where claudio has gone????
jwyles90
Well-known member
He fell down the pinout rabbit hole
Similar threads
