Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: kagliostro on December 25, 2023, 05:19:28 am

Title: Does an arrangement of PS like this give galvanic isolation to the circuit ?
Post by: kagliostro on December 25, 2023, 05:19:28 am

To me seems that as the heater of the rectifier is feed via a galvanic insulated winding the circuit result to be galvanically isolated but only partially because if plate and cathode of the rectifier shorts the circuit will be directly connected to the line

(so I think this configuration is unsafe)

Your opinion ?

Thanks

Franco

p.s.: Obviously if not preceded by an insolation transformer ad suggested on the schematic

Title: Re: Does an arrangement of PS like this give galvanic isolation to the circuit ?
Post by: sluckey on December 25, 2023, 08:12:20 am

The circuit is ALWAYS connected to the line! The only danger from a shorted rectifier is to the filter caps.

Title: Re: Does an arrangement of PS like this give galvanic isolation to the circuit ?
Post by: kagliostro on December 25, 2023, 12:13:19 pm

Thanks Steve

Franco

Title: Re: Does an arrangement of PS like this give galvanic isolation to the circuit ?
Post by: PRR on December 25, 2023, 04:30:12 pm

That drawing is incomplete. Electricity comes off the power line, through the rectifier, to filter caps and to tubes, and then.... where?? A ground symbol? But we know the power company gets ALL their electrons back. So we must assume the ground symbols *also* return to the power company. They usually do, for general safety against lightning and leaks.

However "isolé du réseau" means "isolated site". If that is true, the electrons never come back. It won't work at all.

Title: Re: Does an arrangement of PS like this give galvanic isolation to the circuit ?
Post by: kagliostro on December 25, 2023, 06:40:44 pm

It means insulated from line, I suppose using an insulation transformer and this doubles doubts about that PS


Franco