Problems with diode, lm337 and opamp symbols
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
gEDA |
New
|
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?
tags: | added: symbols |
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.