Re: gEDA-user: wrong pinout lm7912 symbol
Hi John, On Saturday 15 September 2007 15:03, John Luciani wrote: On 9/15/07, Werner Hoch [EMAIL PROTECTED] wrote: You should be fairly safe with the pinouts of the LM79xx and LM78xx since they are older parts and the variety of power dissipation packages is small. There's a TO92 package out there, too. Is the TO92 package for LM79xx or for an LM79Lxx? Maybe it was a LM79Lxx. The dropout voltage on the LM79xx series is fairly high. I would be surprised to see it in a TO92 package. The voltage drop does not care for low current applications, only the power does. Regards Werner ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: wrong pinout lm7912 symbol
Hi Ales, On Tuesday 11 September 2007 21:06, Ales Hvezda wrote: How do you know that this pinout is correct? What other packages does an lm7912 come in other than TO-220? There isn't a footprint= attribute in the original symbol. My concern is breaking existing user schematics. You're right, but changing the pinnumbers without setting the footprint might cause confusion the next time someone stumbles over the pin numbers. You should be fairly safe with the pinouts of the LM79xx and LM78xx since they are older parts and the variety of power dissipation packages is small. There's a TO92 package out there, too. Werner, please feel free to push this fix into the repository. Also, thank you for setting the footprint= and symversion= attributes. The symversion= attribute will alert any existing users that this symbol has changed. Yes, symversion is always a good thing. Regards Werner ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: wrong pinout lm7912 symbol
On 9/15/07, Werner Hoch [EMAIL PROTECTED] wrote: You should be fairly safe with the pinouts of the LM79xx and LM78xx since they are older parts and the variety of power dissipation packages is small. There's a TO92 package out there, too. Is the TO92 package for LM79xx or for an LM79Lxx? The dropout voltage on the LM79xx series is fairly high. I would be surprised to see it in a TO92 package. (* jcl *) -- http://www.luciani.org ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: wrong pinout lm7912 symbol
If someone are about to fix these regulators in the distro, perhaps it vas an idea to drop the net=GND:2 for the 78xx 79xx. Reason: One are free to put the gnd pin on top of a couple of 1N4148's to raise the output voltage. tir, 11 09 2007 kl. 07:21 +0200, skrev Bert Timmerman: T 1600 1100 8 10 0 0 0 0 1 pins=3 T 1600 900 8 10 0 0 0 0 1 net=GND:2 --8-- -- Best whishes Vy 73 de OZ1GNN Christian Treldal ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: wrong pinout lm7912 symbol
On Tue, 2007-09-11 at 13:59 -0400, Ales Hvezda wrote: If someone thinks the attached symbol is ok, I'm pushing it to the repo. How do you know that this pinout is correct? What other packages does an lm7912 come in other than TO-220? There isn't a footprint= attribute in the original symbol. My concern is breaking existing user schematics. -Ales ... They used to be available in TO-3, didn't they? -- Greg Yes, but with a bit different numbering scheme. Usually the pins in TO3 LM/uA7800 are numbered in the following way: transistor BASE pin 1 --- INPUT transistor EMITTER pin 2 OUTPUT transistot COLLECTOR pin 3 GND This is different than in TO220. Some manufacturers does not use pin numbers but only pin names. The TO3 in PCB m4 library has a bug, pins 1 and 2 are swapped so EMITTER is pin 1 and BASE is pin 2. Shall we correct this? There are also LM78Lxx that comes in TO92 (most popular), TO39, SO8, SOT89 ... , each with different pinning! Wojciech ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: wrong pinout lm7912 symbol
There are also LM78Lxx that comes in TO92 (most popular), TO39, SO8, SOT89 ... , each with different pinning! thanks for the tip - I actually needed a small package version of the 5volt version but didn't locate one! gene ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: wrong pinout lm7912 symbol
That pinout is correct for a LM7912 TO-220. You are thinking of the LM7812 positive voltage regulator. Here's the correct pinout for both positive and negative regulators, with link to data sheets: Pinout for LM7812 1. Input 2. Ground 3. Output http://www.onsemi.com/PowerSolutions/product.do?id=MC7812 Pinout for LM7912 1. Ground 2. Input 3. Output http://www.onsemi.com/pub/Collateral/MC7900-D.PDF I know it's correct because my breadboard didn't power up correctly. That's when I checked the pinout on the schematic and found the mistake. gene ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: wrong pinout lm7912 symbol
On 9/11/07, gene [EMAIL PROTECTED] wrote: That pinout is correct for a LM7912 TO-220. You are thinking of the LM7812 positive voltage regulator. Here's the correct pinout for both positive and negative regulators, with link to data sheets: Pinout for LM7812 1. Input 2. Ground 3. Output http://www.onsemi.com/PowerSolutions/product.do?id=MC7812 Pinout for LM7912 1. Ground 2. Input 3. Output http://www.onsemi.com/pub/Collateral/MC7900-D.PDF I know it's correct because my breadboard didn't power up correctly. That's when I checked the pinout on the schematic and found the mistake. Sorry about that. You are correct. When I quickly mis-read your email I thought you were stating the gEDA pinout not the correct pinout. (* jcl *) -- http://www.luciani.org ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: wrong pinout lm7912 symbol
how can the library get corrected, so that nobody runs into trouble? div ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: wrong pinout lm7912 symbol
Hi carzrgr8, On Tuesday 11 September 2007 18:51, [EMAIL PROTECTED] wrote: how can the library get corrected, so that nobody runs into trouble? Wait till one of the developers correct it and puts it to the repo ;-). If someone thinks the attached symbol is ok, I'm pushing it to the repo. Regards Werner lm7912-1.sym Description: application/sym-geda ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: wrong pinout lm7912 symbol
If someone thinks the attached symbol is ok, I'm pushing it to the repo. How do you know that this pinout is correct? What other packages does an lm7912 come in other than TO-220? There isn't a footprint= attribute in the original symbol. My concern is breaking existing user schematics. -Ales ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: wrong pinout lm7912 symbol
On Tue, Sep 11, 2007 at 07:17:08AM -0400, John Luciani wrote: Pinout for LM7812 1. Input 2. Ground 3. Output http://www.onsemi.com/PowerSolutions/product.do?id=MC7812 Only for the TO92, right? The TO220 doesn't match. I have different symbols for the two for 7805. -- Ben Jackson AD7GD [EMAIL PROTECTED] http://www.ben.com/ ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: wrong pinout lm7912 symbol
On 9/11/07, Ales Hvezda [EMAIL PROTECTED] wrote: If someone thinks the attached symbol is ok, I'm pushing it to the repo. How do you know that this pinout is correct? What other packages does an lm7912 come in other than TO-220? There isn't a footprint= attribute in the original symbol. My concern is breaking existing user schematics. You should be fairly safe with the pinouts of the LM79xx and LM78xx since they are older parts and the variety of power dissipation packages is small. Some of the SMD versions require that you use pin four (the tab) as an electrical connection (since there is no external connection for pin 2). These should probably be separate symbols. (* jcl *) -- http://www.luciani.org ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: wrong pinout lm7912 symbol
On Tue, 2007-09-11 at 13:59 -0400, Ales Hvezda wrote: If someone thinks the attached symbol is ok, I'm pushing it to the repo. How do you know that this pinout is correct? What other packages does an lm7912 come in other than TO-220? There isn't a footprint= attribute in the original symbol. My concern is breaking existing user schematics. -Ales ... They used to be available in TO-3, didn't they? -- Greg ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: wrong pinout lm7912 symbol
On 9/10/07, gene [EMAIL PROTECTED] wrote: In gschem version 20070526, the symbol lm7912 has incorrect pinout. Assuming it's TO-220, pinout should be: 1. GND 2. INPUT 3. OUTPUT but the symbol in library has pin2 1 and 2 reversed. That pinout is correct for a LM7912 TO-220. You are thinking of the LM7812 positive voltage regulator. (* jcl *) -- http://www.luciani.org ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: wrong pinout lm7912 symbol
Hi all,
I think Gene is right.
In the git.gpleda repo lm7912-1.sym gives:
Pin #1 - IN
Pin #2 - GND
Pin #3 - OUT
Which is just like any TO220 LM78xx would be :-(
Kind regards,
Bert Timmerman.
--8--
v 20031231 1
T 900 100 9 8 1 0 0 0 1
7912
B 300 300 1000 600 3 0 0 0 -1 -1 0 -1 -1 -1 -1 -1
T 1600 1300 8 10 0 0 0 0 1
device=7912
P 300 600 0 600 1 0 1
{
T 100 650 5 8 1 1 0 0 1
pinnumber=1
T 100 650 5 8 0 0 0 0 1
pinseq=1
T 400 600 9 8 1 1 0 0 1
pinlabel=IN
}
P 800 0 800 300 1 0 0
{
T 700 100 5 8 1 1 0 0 1
pinnumber=2
T 700 100 5 8 0 0 0 0 1
pinseq=2
T 656 401 9 8 1 1 0 0 1
pinlabel=GND
}
P 1300 600 1600 600 1 0 1
{
T 1430 650 5 8 1 1 0 0 1
pinnumber=3
T 1430 650 5 8 0 0 0 0 1
pinseq=3
T 948 600 9 8 1 1 0 0 1
pinlabel=OUT
}
T 1400 1000 8 10 1 1 0 6 1
refdes=U?
T 1600 1100 8 10 0 0 0 0 1
pins=3
T 1600 900 8 10 0 0 0 0 1
net=GND:2
--8--
-Oorspronkelijk bericht-
Van: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Namens John Luciani
Verzonden: dinsdag 11 september 2007 5:36
Aan: gEDA user mailing list
Onderwerp: Re: gEDA-user: wrong pinout lm7912 symbol
On 9/10/07, gene [EMAIL PROTECTED] wrote:
In gschem version 20070526, the symbol lm7912 has incorrect pinout.
Assuming it's TO-220, pinout should be:
1. GND
2. INPUT
3. OUTPUT
but the symbol in library has pin2 1 and 2 reversed.
That pinout is correct for a LM7912 TO-220.
You are thinking of the LM7812 positive voltage regulator.
(* jcl *)
--
http://www.luciani.org
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