DIY phonostage.

[mac72]

DDCR is the way of decoupling mains ground from star/chassis with network diode-diode-cap-resistor ,

[RothwellAudio]

The chassis needs to be connected to mains earth for safety. That's always true if there's mains voltage inside. The chassis should not be decoupled from mains earth.
The circuit's 0V is another matter. That could be left completely unconnected to the chassis, but it's convenient to use the chassis for screening the circuit, in which case something like your "DDCR" would be useful, but it's there to decouple 0V from mains earth and the chassis, not to decouple mains earth from the chassis!

[mac72]

That's correct , please disregard decoupling mains ground bit

[sq225917]

Sadly they're spoken for.

I run a four wire connection between the psu chassis and the amp chassis. 3 wires are +/0/- and the 4th (Grey) is the chassis ground which comes in from the amp chassis and meets the star earth in the PSU chassis. The star earth is also the PE. In the amp chassis all sockets are isolated from the chassis. Signal 0v does not join the chassis or mains/PE at any point. My tonearm body is earthed to the chassis gnd on one of the amp channels. So signal is floating from mains gnd, always seemed better, lower noise than running a DDRC as a lift.




I don't run the common mode choke 0v node back to the star earth, this only ever coupled noise.

[Bksabath]

Simon sorry
On the Calvins no 27 homes resistor under the inductance ?

[sq225917]

It's under the pcb

[337alant]

It's under the pcb

Like this

IMG_2910 by Alan Towell, on Flickr

Alan

[sq225917]

I think he means on the Calvins, 27r.

I have caddock 10r in the psu, after the choke. You can just see them.

[sq225917]

....resistors after the choke in the psu...not before as shown in both of our psu's.

[sq225917]

I need to put a transformer order in with Farnell so I'll order 50 j107 as well. Should be here Tuesday I'll send them out with your PF5102 boys....