Internal power supply and PSU mod

The upper 15AC will be connected to the D1 anode.

I wonder though; 0v is that connected to 220v GND? (I mean, chassis is connected to gnd and pots and what not will touch schassis).

Thank you for your reply !

xlarge wrote:The upper 15AC will be connected to the D1 anode.

OK, thank you ! I was thinking that would result 15 + 15 = 30 V

I didn't understand the question in your second sentence...

It will.

You want:
+15V referenced to 0V
-15V referenced to 0V
potential difference is 30V

My question about gnd and 0V was aimed at the originator of this mod.

I've pm:ed that person to but no answer as of yet.

Hi xlarge,

Sorry for the late reply, I didn't spot the pm...

So, the 230V gnd will be wired to the chassis. I used one of the mounting screws of the C14 socket. The 0V connection goes also to there via the loop breaker.
See pictures 8-10 on the Imgur album: http://imgur.com/a/IeBch#8

Hope this helps.

Kind regards, Jeroen

Kickass, thanks Jeroen!

What is the transformer part number (which shop was it bought from) in the original post?

I used this: http://www.digikey.com/product-detail/en/0/1295-1065-ND

Make sure that whatever you choose has 2 15VAC secondaries and at least 15VA

I ordered my transformer at Reichelt at the time. You need indeed 2x 15VAC with atleast 500mA per secondary.

EchoBoy wrote:@deejayraoul: Did you keep the external supply option to make a SNR comparison between external and internal supply?

I did not have time to investigate on my hum issue yet. Sorry Jeroenbvo for not having replied earlier.
In my case the hum is present on all outputs, whether instruments are played or not. This hum also exists with the external supply but >10dB quieter which makes it acceptable.
For now I suspect radiation from the toroidal transformer.

I kept my external power supply, didn;t do any scientific comparison, but it was obvious.
I gues i need to
find a shieldedtransformer (wich would be quie hard as the transformer hardly fits in the metal case at the moment)
ór
find a way to shield this transformer (does anyone know of a safe way/material to do this?)
ór
deal with the noise
ór
go back to the external power supply.

i have 2 yoctos here, exact same internal psu, using similar connection like discussed in this topic. one has very loud interference on the congas, the other is a bit less, but its still there.
Listen here: https://soundcloud.com/rvooh/david-yoct ... se/s-tdo8y (I go from LC to MC, then HC, each time i turn tune from min to max)

Doesn't anyone have a working solution for this by now?