Problems with diode, lm337 and opamp symbols

Bug #911692 reported by Erik Keever on 2012-01-04
12
This bug affects 2 people
Affects Status Importance Assigned to Milestone
gEDA
Undecided
Unassigned

Bug Description

There are two diode symbols in geda with opposite directions, however they mark the same pins as anode/cathode; Revised diode-3.sym is attached.

The LM337 negative regulator symbol assumes the same pinout as LM317 positive regulator; Correct lm337-1.sym is pasted due to there being only 1 attachment.

opamp-1.sym and opamp-2.sym both have no pins assigned beyond the default numbering 1-5. If aop-std is supposed to be the single opamp, it should be so marked; If they are to stay, they should be indicated as not being the amp-on-board symbols. In all cases, the positive and negative power rails are _not_ marked, which is treachery waiting to happen if someone flips the symbol to have - on top as is common for negative gain circuits.

v 20100214 2
B 300 300 1400 1000 3 0 0 0 -1 -1 0 -1 -1 -1 -1 -1
P 300 800 0 800 1 0 1
{
T 100 800 5 10 0 0 0 0 1
pinnumber=2
T 100 900 5 10 1 1 0 0 1
pinseq=2
T 600 700 9 10 1 1 0 6 1
pinlabel=Vin
}
P 2000 800 1700 800 1 0 0
{
T 1900 900 5 10 1 1 0 6 1
pinnumber=3
T 1900 700 5 10 0 0 0 0 1
pinseq=3
T 1300 700 9 10 1 1 0 0 1
pinlabel=Vout
}
P 1000 0 1000 300 1 0 0
{
T 1100 100 5 10 1 1 0 0 1
pinnumber=1
T 200 100 5 10 0 0 0 0 1
pinseq=1
T 1000 400 9 10 1 1 0 3 1
pinlabel=Adjust
}
T 300 1400 9 10 1 0 0 0 1
LM337
T 300 1700 8 10 0 0 0 0 1
device=LM337
T 1700 1400 8 10 1 1 0 6 1
refdes=U?

Erik Keever (ekeever1) wrote :
Peter TB Brett (peter-b) on 2012-11-17
tags: added: symbols
Lawrence Hallman (m1cr0macr0) wrote :

In the directory file:///usr/share/gEDA/sym/diode/:

diode-1.sym (Cathode =pin 2)
diode-2.sym (Cathode =pin 2)
diode-3.sym (Cathode =pin 1)

After some searching, I found that some mfg's mark the Anode as Pin 1 but in many others, it the Cathode
In PCB, the footprint diode_lay 300.fp marks the cathode as pin 1. Glad I examined the PCB layout before and caught this before sending a run into production as I am reading in many places that Pin 1 is always Cathode. I can see where diode-1.sym and diode-3.sym are opposites to work around this but perhaps the pins be shown to help avoid confusion for users who may be unaware of these differences.

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