Hate to ruin the scam, but the heat dissipated is gonna be the same -
experience, not Bob."HH" <hh@hotmail.com
"Rob Judd" <judd@ob-wan.com> wrote in message
news:3F782F29.18BE4D97@ob-wan.com...
I have only one word for you: PT78T112V
Rob
VK3XVK
Hate to show my ignorance, but what is a PT78T112V?
I have searched the web and nothing shows up.
HH
** It was the PT boat that Bob Kennedy commanded after the PT109
ank -
wasn't it?
.......... Phil
Very droll, Phil.However it was Jack Kennedy that went through this
The PT78STxxx product line is a switch-mode drop-in replacement for LM78xx
Indeed they are. However the price, from Farnell, of $59.12
quantities. Not LM78xx series for sure, but how much heat do you want?
Fark, that IS nice
Either way, a lower Vin from another wall wart would be a simpler fix."Mike Harding" <mike_harding1@nixspamhotmail.com> wrote in message
news:lpvjnv8lcgof2ma76ogqlpta4a1ql3uq20@4ax.com...
On Wed, 1 Oct 2003 09:11:12 +1200, "Ken Taylor" <ken123@xtra.co.nz
wrote:
The PT78STxxx product line is a switch-mode drop-in replacement for
LM78xx
technology. From Power Trends, a TI division.
http://focus.ti.com/lit/ds/symlink/pt78st112.pdf
Nice devices.
Indeed they are. However the price, from Farnell, of $59.12
each is not!
Mike Harding
US$9 (a bit less) from TI (qty:25) or about US$14 from Arrow in single
quantities. Not LM78xx series for sure, but how much heat do you want?
Absolutely!On Wed, 1 Oct 2003 12:09:04 +1200, "Ken Taylor" <ken123@xtra.co.nz
wrote:
"Mike Harding" <mike_harding1@nixspamhotmail.com> wrote in message
news:lpvjnv8lcgof2ma76ogqlpta4a1ql3uq20@4ax.com...
On Wed, 1 Oct 2003 09:11:12 +1200, "Ken Taylor" <ken123@xtra.co.nz
wrote:
The PT78STxxx product line is a switch-mode drop-in replacement for
LM78xx
technology. From Power Trends, a TI division.
http://focus.ti.com/lit/ds/symlink/pt78st112.pdf
Nice devices.
Indeed they are. However the price, from Farnell, of $59.12
each is not!
Mike Harding
US$9 (a bit less) from TI (qty:25) or about US$14 from Arrow in single
quantities. Not LM78xx series for sure, but how much heat do you want?
Either way, a lower Vin from another wall wart would be a simpler fix.
"budgie" <budgie@nowhere.cantech.net.au> wrote in message
news:3f7a601b.1181192@news.cantech.net.au...
On Wed, 1 Oct 2003 12:09:04 +1200, "Ken Taylor" <ken123@xtra.co.nz
wrote:
"Mike Harding" <mike_harding1@nixspamhotmail.com> wrote in message
news:lpvjnv8lcgof2ma76ogqlpta4a1ql3uq20@4ax.com...
On Wed, 1 Oct 2003 09:11:12 +1200, "Ken Taylor" <ken123@xtra.co.nz
wrote:
The PT78STxxx product line is a switch-mode drop-in replacement for
LM78xx
technology. From Power Trends, a TI division.
http://focus.ti.com/lit/ds/symlink/pt78st112.pdf
Nice devices.
Indeed they are. However the price, from Farnell, of $59.12
each is not!
Mike Harding
US$9 (a bit less) from TI (qty:25) or about US$14 from Arrow in single
quantities. Not LM78xx series for sure, but how much heat do you want?
Either way, a lower Vin from another wall wart would be a simpler fix.
Absolutely!
Ken
(Please post followups or tech enquires to the newsgroup)Thanks to all, after reading your responses, it would seem that I will have
to resort to 2 x plug packs, one 24v & 12v.
I appreciate your input
Harry Harms
"Ken Taylor" <ken@home.nz> wrote in message
news:b%veb.164517$JA5.4057339@news.xtra.co.nz...
"budgie" <budgie@nowhere.cantech.net.au> wrote in message
news:3f7a601b.1181192@news.cantech.net.au...
On Wed, 1 Oct 2003 12:09:04 +1200, "Ken Taylor" <ken123@xtra.co.nz
wrote:
"Mike Harding" <mike_harding1@nixspamhotmail.com> wrote in message
news:lpvjnv8lcgof2ma76ogqlpta4a1ql3uq20@4ax.com...
On Wed, 1 Oct 2003 09:11:12 +1200, "Ken Taylor" <ken123@xtra.co.nz
wrote:
The PT78STxxx product line is a switch-mode drop-in replacement for
LM78xx
technology. From Power Trends, a TI division.
http://focus.ti.com/lit/ds/symlink/pt78st112.pdf
Nice devices.
Indeed they are. However the price, from Farnell, of $59.12
each is not!
Mike Harding
US$9 (a bit less) from TI (qty:25) or about US$14 from Arrow in single
quantities. Not LM78xx series for sure, but how much heat do you want?
Either way, a lower Vin from another wall wart would be a simpler fix.
Absolutely!
Ken
US$9 (a bit less) from TI (qty:25) or about US$14 from Arrow in single
quantities. Not LM78xx series for sure, but how much heat do you want?
They're shiploads cheaper form the US (like everything else), 80+%
Sometimes you don't have the option. I use the PT78ST105H in myOn Wed, 1 Oct 2003 12:09:04 +1200, "Ken Taylor" <ken123@xtra.co.nz
wrote:
"Mike Harding" <mike_harding1@nixspamhotmail.com> wrote in message
news:lpvjnv8lcgof2ma76ogqlpta4a1ql3uq20@4ax.com...
On Wed, 1 Oct 2003 09:11:12 +1200, "Ken Taylor" <ken123@xtra.co.nz
wrote:
The PT78STxxx product line is a switch-mode drop-in replacement for
LM78xx
technology. From Power Trends, a TI division.
http://focus.ti.com/lit/ds/symlink/pt78st112.pdf
Nice devices.
Indeed they are. However the price, from Farnell, of $59.12
each is not!
Mike Harding
US$9 (a bit less) from TI (qty:25) or about US$14 from Arrow in single
quantities. Not LM78xx series for sure, but how much heat do you want?
Either way, a lower Vin from another wall wart would be a simpler fix.
One question is why is the heat from the 7812 such a problem? If you
can mount it on a metal frame or some such it can source up to about
1.5A into a load, almost any regulator is going to produce heat if you
draw current through it - getting rid of the heat is the problem it
seems to me. 7812's can handle up to around 35VDC (AIR) input voltage
and you could add a dropping resistor in series with the front end of
the regulator to reduce the heat generated in the 7812...
John :-#)#
On Wed, 01 Oct 2003 10:23:18 GMT, "HH" <hh@hotmail.com> wrote:
Thanks to all, after reading your responses, it would seem that I will
have
to resort to 2 x plug packs, one 24v & 12v.
I appreciate your input
Harry Harms
"Ken Taylor" <ken@home.nz> wrote in message
news:b%veb.164517$JA5.4057339@news.xtra.co.nz...
"budgie" <budgie@nowhere.cantech.net.au> wrote in message
news:3f7a601b.1181192@news.cantech.net.au...
On Wed, 1 Oct 2003 12:09:04 +1200, "Ken Taylor" <ken123@xtra.co.nz
wrote:
"Mike Harding" <mike_harding1@nixspamhotmail.com> wrote in message
news:lpvjnv8lcgof2ma76ogqlpta4a1ql3uq20@4ax.com...
On Wed, 1 Oct 2003 09:11:12 +1200, "Ken Taylor"
ken123@xtra.co.nz
wrote:
The PT78STxxx product line is a switch-mode drop-in replacement
for
LM78xx
technology. From Power Trends, a TI division.
http://focus.ti.com/lit/ds/symlink/pt78st112.pdf
Nice devices.
Indeed they are. However the price, from Farnell, of $59.12
each is not!
Mike Harding
US$9 (a bit less) from TI (qty:25) or about US$14 from Arrow in
single
quantities. Not LM78xx series for sure, but how much heat do you
want?
Either way, a lower Vin from another wall wart would be a simpler
fix.
Absolutely!
Ken
(Please post followups or tech enquires to the newsgroup)
John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games)
www.flippers.com
"Old pinballers never die, they just flip out."
Nope. The heat dissipated is STILL (Vin-Vout)*Ipass. You have broken