Have you tested whether the Power Thermistor "alone" can survive a mains short to PE, blow the mains fuse and allow time for the arc to extinguish?
If not, then you are guessing !
And after all that can you test whether the Power Thermistor can be reused, or must be binned after the test?
If you search my name you will find my report on the testing of the "Disconnecting Network". Not only did it survive, the tiny 100nF cap and the 600mW resistor were both undamaged.
If not, then you are guessing !
And after all that can you test whether the Power Thermistor can be reused, or must be binned after the test?
If you search my name you will find my report on the testing of the "Disconnecting Network". Not only did it survive, the tiny 100nF cap and the 600mW resistor were both undamaged.
Dear Zen Mod,
What cascoding input Jfets' how matching should look like between 2SK170(Q1)//2SK170(Q1.1)/2SJ74(Q2)//2SJ74(Q2.1)
Thanks. Raoul
ZM - That's the part numbering scheme on the store F5T boards.
Aft, you want all four as close as possible. I''m not sure what a good Idss match is, but I suspect .2mA or closer should be decent. Minor variations between the SK and SJ pairs can be trimmed out with P3, so get the SKs to match each other and SJs to match each other more closely then work on SK to SJ.
Aft, you want all four as close as possible. I''m not sure what a good Idss match is, but I suspect .2mA or closer should be decent. Minor variations between the SK and SJ pairs can be trimmed out with P3, so get the SKs to match each other and SJs to match each other more closely then work on SK to SJ.
PSU CRC filter dimension
I have a question regarding the resistors in my psu crc filter.
How so I select the right value?
My psu looks like: 2 x 800VA (24V sec.) feeding in total ~350kuF using Tea-Bag boards.
Can someone explain how I calculate the correc value!?
Thanks,
Mallard
I have a question regarding the resistors in my psu crc filter.
How so I select the right value?
My psu looks like: 2 x 800VA (24V sec.) feeding in total ~350kuF using Tea-Bag boards.
Can someone explain how I calculate the correc value!?
Thanks,
Mallard
that's the compromise between ripple taming and ,say, speed of spoon-feeding last caps
say that's nothing wrong with 0R1
say that's nothing wrong with 0R1
ZM, thanks for your reply! Is there any rule of thumb how to calculate it?
The only thing I found was: the best way to find correct valus is to simulate it. But I don't have such simulator.
The only thing I found was: the best way to find correct valus is to simulate it. But I don't have such simulator.
xformer is 400VA , presuming that you are living in Vaterland , with 230Vac mains , that means that inclusion of 10R NTC in mains side of xformer , will allow use of (400VA/230V) 2A to 2A5 slow blow fuse
175mF per PSU leg is on limit ( for 400VA Donut ) , judging only by gut , without any calc
make it CRC (with 0R1 as R ) with 1/3 of C as first and 2/3 of C as final cell
175mF per PSU leg is on limit ( for 400VA Donut ) , judging only by gut , without any calc
make it CRC (with 0R1 as R ) with 1/3 of C as first and 2/3 of C as final cell
I need to correct you, I'm using 800VA donuts, these are more sweeter 😉
Furthermore I'm using Tea-Bags PSU pcb so it is CCRCC.
Furthermore I'm using Tea-Bags PSU pcb so it is CCRCC.
sorry , my mistake
then , with 800VA Donut , that amount of capacity is fine
that change fuse value - needing something in range of 800/230 , so 4A seems fine
then , with 800VA Donut , that amount of capacity is fine
that change fuse value - needing something in range of 800/230 , so 4A seems fine
And actually I planned to use CL30 NTC which has 2.5R and 8A. (like Mr.Pass recommended it)
But wat does it mean for the R ind the CCRCC configuration? Still .1R ok?
But wat does it mean for the R ind the CCRCC configuration? Still .1R ok?
NP is using CL60 , in 115Vac mains area
my experience is that 10R NTC is better for this side of Big Splash , juicing 230Vac from wall
regarding CRC - no matter what size of cap bank is in question , I can't stand more than 0R1 in line
if Donut/Graetz size permits , I'm not using it at all
my experience is that 10R NTC is better for this side of Big Splash , juicing 230Vac from wall
regarding CRC - no matter what size of cap bank is in question , I can't stand more than 0R1 in line
if Donut/Graetz size permits , I'm not using it at all
Pass uses one CL60 for each 115Vac Primary.
In a 220/240Vac supply you still use one CL60 in each 110/120Vac Primary.
i.e. use two CL60 in series to feed the two series connected primaries in a 220/240Vac supply.
In a 220/240Vac supply you still use one CL60 in each 110/120Vac Primary.
i.e. use two CL60 in series to feed the two series connected primaries in a 220/240Vac supply.
In the NPs F5T article is stated:
CLC? Go for it. The thermistor in series with the primary is familiar, and I
recommend the CL30 type. Of course this shows the 120V AC version. For
240V the primary coils are wired in series and the fuse value is halved.
So is there anything what speakes against CL30 from your perspective?
CLC? Go for it. The thermistor in series with the primary is familiar, and I
recommend the CL30 type. Of course this shows the 120V AC version. For
240V the primary coils are wired in series and the fuse value is halved.
So is there anything what speakes against CL30 from your perspective?
The cold resistance is too low.
I would guess that 4 in series would be required for effective current limiting during the start up. But then I don't have the money to squander on 4 CL30 for each big transformer.
I would guess that 4 in series would be required for effective current limiting during the start up. But then I don't have the money to squander on 4 CL30 for each big transformer.
This PSU Simulator is for only one positive rail. But one can play with different configurations and learn :
http://www.duncanamps.com/psud2/