V
Vexator
- Jan 1, 1970
- 0
How could I regulate 190 V DC whit a 78xx? I knew these devices can be used
at this high voltage.
at this high voltage.
From: "Vexator" [email protected]
Date: 9/11/2004 3:09 AM Central Daylight Time
Message-id: <[email protected]>
How could I regulate 190 V DC whit a 78xx? I knew these devices can be used
at this high voltage.
Vexator said:How could I regulate 190 V DC whit a 78xx? I knew these devices can be used
at this high voltage.
I figured he was thinking of the LM317, which because of its differentCFoley1064 said:I believe you mean "Memento Audere Semper" (remember always to be daring or
audacious). That's what happens when you copy mottoes off statues.
The LMXX regulators are good for 35V maximum input voltage. You could shoehorn
one into a scheme for a 190VDC linear regulator, but it would be more trouble
than it's worth. Even as a reference voltage, you'd have to provide a
preregulator to keep from smoking it.
It's possible you saw a 7812 or 7805 as the IC that provided the low voltage
power for the control circuitry in the high voltage power supply you were
looking at.
Be careful. High voltage kills.
Chris
I believe you mean "Memento Audere Semper" (remember always to be daring or
audacious). That's what happens when you copy mottoes off statues.
Vexator said:How could I regulate 190 V DC whit a 78xx? I knew these devices can
be used
at this high voltage.
You are correct sir. "In God We Trvst."Joe McElvenney said:Hi,
The script on Roman statues would have used the letter 'V'
not 'U'
A 'smilee' on the other hand would not be found there unless
it was spray-painted on.
Cheers - Joe
From: "Vexator" [email protected]
Date: 9/12/2004 4:54 AM Central Daylight Time
Message-id: <[email protected]>
thanks all. Now I understand.
example:
I need 190VDC, so using a 7824 and Im going to put one 166V zener between
common and gnd, is it ok?
Vexator said:How could I regulate 190 V DC whit a 78xx? I knew these devices can be used
at this high voltage.
--
MEMENTO AVDERE SEMPER
Giovanni (Italy)
.
Uhm, do you really think that one has to be "wild and crazy" to created an......... those Romans were wild and crazy guys.
The only "limit" on either is the voltage across the chip itself. You couldI figured he was thinking of the LM317, which because of its different
arrangement, can regulate much higher voltage. I'm not sure of the limit.
I'm sure it's spelled out in the datasheet.
I can corroborate this. When I was in the USAF as an electronics tech, weAgain, please be careful here. The switch and 1/4A fuse above are not
optional. Even isolated high voltage can be dangerous. If you don't know
what
you're doing, stop and find out. The "stupid" questions are only stupid
if you
don't know and _don't_ ask them. Have somebody else in the room while
you're
fiddling who knows where the switch is. And do remember Nikolai Tesla's
advice, and use one hand to grab your belt behind your back whenever the
voltage is on.
No. But it helpsGene said:Uhm, do you really think that one has to be "wild and crazy" to created an
empire that lasted 1,000 years?
Gene