I'm not understanding something here. You want to design a power supply that
protects against reverse voltage and overvoltage. OK. Is this power supply a
battery or are you actually building a power supply that runs from the wall
outlet?

The requirements are quite different, depending on what you are trying to
achieve.

Jim



Richard Hosking
shared these priceless pearls of wisdom:

-Dear all
-I want to design a power supply for a low power rig with protection for
-reverse and overvoltage.


Jim Weir, VP Eng. RST Eng. WX6RST
A&P, CFI, and other good alphabet soup

Jim
The rig will be powered from a 12V source eg battery/AC wallwart
/whatever. However, internally the rig needs various voltages, including
1.8V for logic and -12V. I want to ptotect against inadvertent
overvoltage or reverse voltage. I want it to be as efficient as
possible, so I dont want to use a linear regulator. SMPS seems the
obvious choice. I may well shield the PSU section, and isolate the
ground etc to reduce noise. I was seeking advice from the experts here
as to whether the idea is feasible and whether there is a redaymade
solution.

Richard

Jim Weir wrote:
I'm not understanding something here. You want to design a power supply that
protects against reverse voltage and overvoltage. OK. Is this power supply a
battery or are you actually building a power supply that runs from the wall
outlet?

The requirements are quite different, depending on what you are trying to
achieve.

Jim



Richard Hosking
shared these priceless pearls of wisdom:

-Dear all
-I want to design a power supply for a low power rig with protection for
-reverse and overvoltage.


Jim Weir, VP Eng. RST Eng. WX6RST
A&P, CFI, and other good alphabet soup

This may need re-stating. The reverse polarity protection goes IN THE
RADIO, not the power supply. Right fellas?
--
Steve N, K,9;d, c. i My email has no u's.


??? Fort Hose... ??? Cute also:

When the clock gets near 12:00 I stick my head in teh co-workers office &
say
Djeet Jet? If the response is no, then;"Tsqueet!"



"Jim Weir" wrote in message
...

I'm not understanding something here. You want to design a power supply
that
protects against reverse voltage and overvoltage. OK. Is this power
supply a
battery or are you actually building a power supply that runs from the
wall
outlet?

The requirements are quite different, depending on what you are trying to
achieve.

Jim



Richard Hosking
shared these priceless pearls of wisdom:

-Dear all
-I want to design a power supply for a low power rig with protection for
-reverse and overvoltage.


Jim Weir, VP Eng. RST Eng. WX6RST
A&P, CFI, and other good alphabet soup

Jim
The rig will be powered from a 12V source eg battery/AC wallwart
/whatever. However, internally the rig needs various voltages, including
1.8V for logic and -12V. I want to ptotect against inadvertent
overvoltage or reverse voltage. I want it to be as efficient as
possible, so I dont want to use a linear regulator. SMPS seems the
obvious choice. I may well shield the PSU section, and isolate the
ground etc to reduce noise. I was seeking advice from the experts here
as to whether the idea is feasible and whether there is a redaymade
solution.

Richard

Jim Weir wrote:
I'm not understanding something here. You want to design a power supply that
protects against reverse voltage and overvoltage. OK. Is this power supply a
battery or are you actually building a power supply that runs from the wall
outlet?

The requirements are quite different, depending on what you are trying to
achieve.

Jim



Richard Hosking
shared these priceless pearls of wisdom:

-Dear all
-I want to design a power supply for a low power rig with protection for
-reverse and overvoltage.


Jim Weir, VP Eng. RST Eng. WX6RST
A&P, CFI, and other good alphabet soup

This may need re-stating. The reverse polarity protection goes IN THE
RADIO, not the power supply. Right fellas?
--
Steve N, K,9;d, c. i My email has no u's.


??? Fort Hose... ??? Cute also:

When the clock gets near 12:00 I stick my head in teh co-workers office &
say
Djeet Jet? If the response is no, then;"Tsqueet!"



"Jim Weir" wrote in message
...

I'm not understanding something here. You want to design a power supply
that
protects against reverse voltage and overvoltage. OK. Is this power
supply a
battery or are you actually building a power supply that runs from the
wall
outlet?

The requirements are quite different, depending on what you are trying to
achieve.

Jim



Richard Hosking
shared these priceless pearls of wisdom:

-Dear all
-I want to design a power supply for a low power rig with protection for
-reverse and overvoltage.


Jim Weir, VP Eng. RST Eng. WX6RST
A&P, CFI, and other good alphabet soup