Reference "Design Help" thread in rar+p

Thanks for any advice you may have.
--
Say no to institutionalized interference.
Just say NO to HD/IBOC!

"Brenda Ann" wrote in message
...

Reference "Design Help" thread in rar+p

Thanks for any advice you may have.

Just noticed I forgot to draw in the caps across the diodes in the
schematic. There is a .047/630V cap across each diode.

As others in the other group have mentioned, you're pushing your luck with
600V diodes. They have over 700V on them (or they would have if things were
working right). Replace them with 1000V diodes. This also means you need
to replace those capacitors with 1000V capacitors, preferably AC rated.

As someone else said, you have a major problem with the power supply. The
output voltage should be much higher.

--
Jim Mueller

To get my real email address, replace wrongname with eportiz. Then replace
nospam with sacbeemail.

"Brenda Ann" wrote in message
...

"Brenda Ann" wrote in message
...

Reference "Design Help" thread in rar+p

Thanks for any advice you may have.

Just noticed I forgot to draw in the caps across the diodes in the
schematic. There is a .047/630V cap across each diode.

"Jim Mueller" wrote in message
...
As others in the other group have mentioned, you're pushing your luck with
600V diodes. They have over 700V on them (or they would have if things
were working right). Replace them with 1000V diodes. This also means you
need to replace those capacitors with 1000V capacitors, preferably AC
rated.

As someone else said, you have a major problem with the power supply. The
output voltage should be much higher.

--

I think I have kenned out what that problem IS. It's not a 250-0-250.. it's
a 125-0-125 on the secondary.. which would output pretty much what I'm
getting.

"Brenda Ann" wrote in message
...

"Jim Mueller" wrote in message
...
As others in the other group have mentioned, you're pushing your luck
with 600V diodes. They have over 700V on them (or they would have if
things were working right). Replace them with 1000V diodes. This also
means you need to replace those capacitors with 1000V capacitors,
preferably AC rated.

As someone else said, you have a major problem with the power supply.
The output voltage should be much higher.

--

I think I have kenned out what that problem IS. It's not a 250-0-250..
it's a 125-0-125 on the secondary.. which would output pretty much what
I'm getting.


This is my transformer. From Mouser

http://www.hammondmfg.com/pdf/5c0030.pdf #261G6
261G6 45250V C.T.@ 130 ma 6.3V @ 2A 1 4.00 2.50 2.63 3.56 2.0

"Brenda Ann" wrote in message
...

"Brenda Ann" wrote in message
...

"Jim Mueller" wrote in message
...
As others in the other group have mentioned, you're pushing your luck
with 600V diodes. They have over 700V on them (or they would have if
things were working right). Replace them with 1000V diodes. This also
means you need to replace those capacitors with 1000V capacitors,
preferably AC rated.

As someone else said, you have a major problem with the power supply.
The output voltage should be much higher.

--

I think I have kenned out what that problem IS. It's not a 250-0-250..
it's a 125-0-125 on the secondary.. which would output pretty much what
I'm getting.


change it to a bridge rectifier across the whole 250V winding, and
everything should work fine!


This is my transformer. From Mouser

http://www.hammondmfg.com/pdf/5c0030.pdf #261G6
261G6 45250V C.T.@ 130 ma 6.3V @ 2A 1 4.00 2.50 2.63 3.56 2.0

"Brenda Ann" wrote

As others in the other group have mentioned, you're pushing your luck
with 600V diodes. They have over 700V on them (or they would have if
things were working right). Replace them with 1000V diodes. This also
means you need to replace those capacitors with 1000V capacitors,
preferably AC rated.

As someone else said, you have a major problem with the power supply.
The output voltage should be much higher.

--

I think I have kenned out what that problem IS. It's not a 250-0-250..
it's a 125-0-125 on the secondary.. which would output pretty much what
I'm getting.


This is my transformer. From Mouser

http://www.hammondmfg.com/pdf/5c0030.pdf #261G6
261G6 45250V C.T.@ 130 ma 6.3V @ 2A 1 4.00 2.50 2.63 3.56 2.0



What is the modulation transformer you're using?

If it's a mains transformer it could be going into saturation. Proper
modulation transformers are designed to accomodate a d.c. bias through the
windings which normally requires an airgap in the core. In an ungapped core
the dc bias will drive the core somewhere up the BH curve and the effects
will be exactly as you describe - clipping on one of the peaks