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Planning to build benchtop 500V tube PSU, help needed.

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001:

--- Quote from: Wolfgang on December 17, 2018, 12:57:19 pm ---Hi,

I will post a floating design in a few days, sorry for the delay.

--- End quote ---

Any news? Please

Best Wishes  :-+

Wolfgang:
Hi,

I know I am late, but the upcoming holidays dont leave so much time for my hobby.

Anyway, I would like to prod along the schematics in my website below:

https://electronicprojectsforfun.wordpress.com/power-supplies/high-voltage-lab-power-supplies/a-250v-150ma-variable-linear-power-supply/

This is a true floating design that worked very well (using semiconductors only).

Your PSU has some extra requirements:

- no silicon, glass only - IIRC one of your last comments.
- voltage setting from 0 to 500V
- amps up to 100mA
- foolproof, robust, all components run safely below their maximum ratings.

Consequences are:

- a lot of transformers for the aux voltages plus the heaters (alternative is a custom made transformer for everything in 1 core)
- data will be not as good as the semiconductor design (ripple rejection, stability, out voltage accuracy, ...) .
  It will be perfectly usable for tube circuits, however.

What holds me up the most is getting useful SPICE models of the tubes I wanted to use.

I have started a webpage showing what has been done so far at:

https://electronicprojectsforfun.wordpress.com/power-supplies/high-voltage-lab-power-supplies/an-all-tube-500v-100ma-regulated-power-supply/

Nice holidays
  Wolfgang


TERRA Operative:
Wow, awesome work so far! No rush, I'm on holiday too. :)

A couple silicon diodes in the design would be ok if absolutely necessary, as the original schematic has a few, but transistors are too new-fangled for the 60's style. :D
I can get a custom transformer made, but if it can be made with an off the shelf transformer/transformers, it'd make it much easier for others to make their own.

I think the simpler, the better. My use case for this is only for powering tube based projects, so looser output parameters for ripple, regulation, etc are fine.

001:

--- Quote from: Wolfgang on December 23, 2018, 01:14:50 am ---
This is a true floating design that worked very well (using semiconductors only).

--- End quote ---

Awesome work!

Looks very interesting. Can You tell how it works and why so many TL431 used?

Thanx


UPD : Sorry. Is CNY17 wiring correct at diagram? Is it good idea change 1000pF caps with 100pF? Thanx

UPD2: What the usage difference with Yours awesome second project https://electronicprojectsforfun.wordpress.com/power-supplies/high-voltage-lab-power-supplies/a-500v-30ma-variable-linear-power-supply/

UPD3: Sorry for my delight and curiosity! Can You post diagram for https://electronicprojectsforfun.wordpress.com/power-supplies/high-voltage-lab-power-supplies/a-dual-120v200ma-linear-power-supply/ and https://electronicprojectsforfun.wordpress.com/power-supplies/high-voltage-lab-power-supplies/a-275v-50ma-fixed-linear-power-supply/ ?

UPD4: Does You use supressor diode like reference voltage sourse here? https://electronicprojectsforfun.wordpress.com/power-supplies/high-voltage-lab-power-supplies/a-1kv-50ma-linear-power-supply/

Happy Christmas too!

coppercone2:

--- Quote from: David Hess on December 11, 2018, 07:01:47 pm ---For practical reasons I would use silicon diodes to replace the rectifier tube and zener diodes to replace the voltage reference tube.

The same configuration with a single pass transistor and single transistor error amplifier was common in early power supplies.

--- End quote ---

careful making parts choices because of heat. I think mr. carlson measured those tube regulators to be something like 90ppm/c and they worked better then a zener diode as a regulator in the tube chassis (as a mod). he warned about this.

I would agree with the silicon diodes.

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