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Re: PCB schematic design issues #gettingstarted

 

Having a look to the supposed to be the two TO-92 (package with Transistor EBC pins in-line)
in there on your PCB (extracted from your png file):
image.png

Have a look to KiCad's 'footprint library':
image.png
You shall then see this (by searching for TO92 possibilities, so as to select the 'best one which could fit your need'):

image.png

For? TO92 '3 pins in-line' (double-clicking on the different items in the list to show the pads footprints):
image.png? probably the one you are using (and normally with no difficulty to solder...)

or
could select a 'larger footprint one' (if you still worry about the one you are using):
?image.png image.png (both of these footprints having the 'same pitch'...)


You could also use the following one (which could be better if you are 'not confortable in soldering')
but for TO92 package 'with not in-line pins'.
If you have already procured your TO92's with in-line pins, to bend the pins before being able to insert the parts and then solder each of these pins...

image.png

With hope it will help (or answer your coach's fears, if any ?).

KR
GerardFX





Le?jeu. 17 f¨¦vr. 2022 ¨¤?17:26, Andrew Armstrong <andrew@...> a ¨¦crit?:

The normal way to allow enough space between tht transistor terminals, unless you have a *very* high tech PCB fabrication system, is to offset the middle (usually base) connection vertically. I would suggest the TO-92L_Wide footprint if you are going to etch your own PCB. If so, then it would also be advisable to edit the footprint for your PCB (and save it in a new library for future use), so that there is a little more copper around the holes. That will make hand-drilling less likely to destroy the pad.

Also, double check that the numbering of the transistor terminals on the schematic symbol matches the data sheet and footprint, because a few TO92 transistors have the collector in the middle.

hth

Andrew

On 16/02/2022 18:32, sean.buchinger@... wrote:
Hello, I'm new to using this software and pretty much everything that has to do with PCB design and manufacturing products. I'm currently trying to design and build a flashing LED circuit for an engineering project. The issue I'm inquiring about has to do with the closeness of the THT pads for my two transistors. When I printed out the trace on a piece of paper from a PDF format, the pads are extremely close together and my engineering teacher is concerned that this will hinder the traces and will make it very difficult to produce a working circuit. There is an attached screen shot of the PDF. 
-- 
e: andrew@...

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