UcD400 Q & A

[FransDHT]

And this is the other one: Front and rear of one side to one supply and front/rear of the other side and center to the other supply:

[Jan-Peter]

Gaincalculating of the UcD;

Gain=(1+2*A/B)*D/C

Please see picture.

In the current module, the values are;
A= 1000 ohm
B= 560 ohm
C= 1800 ohm
D= 8200 ohm

Thanks to Bruno.

Regards,

Jan-Peter

[Bruno Putzeys]

Originally posted by FransDHT
And this is the other one: Front and rear of one side to one supply and front/rear of the other side and center to the other supply:

Well at least you'd go for an arrangement which is left/right symmetrical.

1) The trivial case is one power supply for everything.
2) Front channels on one, remainder on the other.
3) Rear channels on one, remainder on the other.

I don't think there is much difference between 1, 2 and 3. A three-supply arrangement can make a difference: FL and RL have their own supply, the remainder shares the third.

Personally I wouldn't bother with intermediate arrangements. Either I'd have one supply for 5 channels or I'd have 5 mono blocks.

[FransDHT]

Bruno,

Since I will have two 500VA transformers and two sets of rectifier/BCC-cap (all supplied by Jan-Peter), will nickywicky's solution be the best? Will I need additional components for that solution?

How would that supply look in schematics?

Thanks for the help so far!

Frans

[Bruno Putzeys]

Originally posted by FransDHT
Bruno,

Since I will have two 500VA transformers and two sets of rectifier/BCC-cap (all supplied by Jan-Peter), will nickywicky's solution be the best? Will I need additional components for that solution?

Since it is already decided you will be using two supplies, I'd go for one supply for left/right, an other for the two rears and center.
Under the presumption that most of the power will be in the front channels this will give you the best reserve.

[ewildgoose]

Hi, What exactly is Jan-Peter supplying in his powersupply kits?

Is it:
- 2x 10,000 caps
- single rectifier
- anything else?

Do these rectifiers benefit from bypassing with a small cap?

Would there be any benefit in a high end setup (using only a single transformer) from:
a) using two power supplies, one for each channel
b) using two rectifiers, one for each power rail

Thanks

[Jan-Peter]

Ewildgoose,

In the kit we have;
500VA toroidel transformer for 230V and 115V mains, gives 2x57VDC.
10.000uF / 63V BC Components capacitor (056 series, 2222.056.58103)
KBPC3502 bridge rectifier.
4x 100nF MKP capacitor.

Regards,

Jan-Peter

[Bruno Putzeys]

Originally posted by ewildgoose

Would there be any benefit in a high end setup (using only a single transformer) from:
a) using two power supplies, one for each channel
b) using two rectifiers, one for each power rail

a: yes. The improvement in stereo imaging is clearly noticeable, and therefore worthwhile
b: no, but. You can use lower voltage rectifiers, making the use of schottky diodes practical. If you're using non-schottky rectifiers, don't bother.

[FransDHT]

Hi,

Just returned from a visit to hypex to collect my 5 UcD400's and the power supplies. They were just testing the modules (nrs 049-053) so I had time for a chat. Very nice!

Jan-Peter suggested to use them balanced, but my pre-pro (Linn 5103) doesn't have a balanced output. He suggested to mak a cable with on one end XLR and on the other end RCA, with the - connected to ground at the RCA-side. What type of cable can I use for this? It needs at least 3 leads, can I for example connect the outer shielding to - at the XLR-side and to ground at the RCA-side?

Frans

[Bruno Putzeys]

Originally posted by FransDHT
It needs at least 3 leads, can I for example connect the outer shielding to - at the XLR-side and to ground at the RCA-side?

You need only 2 leads, not 3. The third "lead", which connects pin 1 to ground, is the shield itself. Ask for "microphone cable" in an electronics store.