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Simplistic Mosfet HV Shunt Regs
Simplistic Mosfet HV Shunt Regs
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Old 3rd April 2020, 11:21 PM   #6101
Salas is offline Salas  Greece
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Simplistic Mosfet HV Shunt Regs
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Originally Posted by morpheous View Post
Mains 235v and at the secondary 196v
The sim gives similar DC results to what you get for 196V AC & 54R secondary resistance
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Old 4th April 2020, 11:35 AM   #6102
morpheous is offline morpheous  Italy
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Hi Salas,

finally, I combine two 82 ohm 2W resistors in parallel found in the parts bin and now I set the V-Out to 260V e the I-Out to 20ma
Is the resistance value too small?
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Old 4th April 2020, 12:38 PM   #6103
Salas is offline Salas  Greece
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Simplistic Mosfet HV Shunt Regs
No, I wouldn't say uselessly small, its doing some useful filtering still. If you will need more mA CCS for the preamp its another thing. You will be forced to lower the R even more. Even little is good for at least opposing rectification's EMI. In general to be on the safe side, when buying HV rail transformers for future projects use ballpark calculation for expected DC=ACx1.3. If proving some excess you can burn it on R, if proving short due to losses you can't do something.
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Old 4th April 2020, 02:29 PM   #6104
morpheous is offline morpheous  Italy
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Thanks Salas,

My fault, in this case, is DC=ACx1,4.... for the future DC=ACx1.3
Now, I'm waiting for Salas SSLV1.3 Ultra-BIB Tea Bag already send to me I need for 12.6 and 6.3 and ready to go
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Old 6th April 2020, 05:43 PM   #6105
morpheous is offline morpheous  Italy
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Hi Salas,

a question, below there is my transformer, I use only one of 200V RED ( in Italian Rosso ) to connect to rectification with Black ( Nero)
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File Type: jpg IMG_1663 copy.jpg (377.1 KB, 121 views)
File Type: jpg IMG_1665.jpg (646.8 KB, 115 views)
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Old 7th April 2020, 06:41 AM   #6106
Salas is offline Salas  Greece
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Simplistic Mosfet HV Shunt Regs
It has 200V secondary between Rosso Nero. Has 400V between Rosso Rosso. Confirm with ACV meter 200V between one red and the black. Be careful not to accidentally touch the naked end of wires when measuring. Bianco is 0V for heaters.
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Old 7th April 2020, 02:03 PM   #6107
euro21 is offline euro21  Hungary
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Simplistic Mosfet HV Shunt Regs
This is 220V primary transformer, so secondary would be 213.6V AC (at 235V input).

With this transformer you are in the low side of raw supply voltage.
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File Type: jpg 210V AC PSU test.jpg (145.2 KB, 112 views)

Last edited by euro21; 7th April 2020 at 02:06 PM.
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Old 7th April 2020, 02:07 PM   #6108
Salas is offline Salas  Greece
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Simplistic Mosfet HV Shunt Regs
If accurate to its label
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Old 7th April 2020, 02:42 PM   #6109
morpheous is offline morpheous  Italy
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In the picture the input ( blue voltmeter ) and the output from transformer the other voltmeter
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Old 7th April 2020, 02:54 PM   #6110
Salas is offline Salas  Greece
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Simplistic Mosfet HV Shunt Regs
Little bit over 1.1 AC ratio when unloaded. Better without center tap, quad bridge to save on peak inverse voltage across the diodes IMO.
 

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