Adret 104 voltage reference schematic ?

[Overspeed]

Hello

Does some one have a schematic , this Voltage source is still in use in some lab performances are impressive but as that old ??

Perhaps with the schematic and the components available in 2024 that possible to built a clone ?

There is also a 103 model for both current and voltage source.

Regards
OS

[Overspeed]

Hello

I link the patent ( in French )

Adret works following schematic Fig 2 ( Figure = picture )

Regards
OS

[Overspeed]

Hello

This forum subject is linked :

https://www.eevblog.com/forum/projects/making-a-pwm-based-voltage-standard/

But no circuit schematic is provided

Regards
OS