Anodising Alep5 : what color ???

[jacco vermeulen]

Yellow pages.
Price often depends how much you are in a hurry, this small stuff often goes in an empty space between a big order.
As with chroming, price usually is determined by the volume size.

 

[Berry]

You can also do it my way, I used aluminium witch is blown with sand. If you know some one with a compressor and an old paint brush. Just open the end of the paint brush a little bit more.

 

[ElectroNick]

Update !

Well, tonight i ripped the Aleph apart and started measuring.

First thing : the 50 Hz i heard, is actually the 100 Hz from de power-supply. On the scope i see a triangular voltage of 300 mV. Disconnecting a channel gives me still a 170 mV of ripple on the capacitors.

Results of this ripple is a 30 mV ripple on the output. That's the "humm" i heard

Now what ?

1) Get rid of the 4x47000uF and place more capacity ?
2) place inductors between the caps ? (CLC) -> value suggestions...?
3) or try a resistor ? (CRC) -> value suggestions...?

Hope to hear from you......

Grtz,
Nick

ps: how about the original Aleph 5 ? They have less capacity and less humm

 

[Fox]

CRC

Hi Nick,

I am sure you heard form PSU-designer of Duncan Amps. With this piece of software you can simulate the impact of various filter configurations on the power supply ripple.

For my Aleph 5 monoblocks I have opted for a CRCC-filter with each C being 22.000 uF and the R 0,39 Ohm (10 Watt). The amps are deathly quiet.

Hope this helps,

JP

 

[jacco vermeulen]

Wim,

i have really good experiences with Intertechnik torobar's for CLC filters.
William too, he recently confirmed that torobar's can deliver plenty current before saturating.
Small, easy to buy around the corner, a lot cheaper than regular coils.
A lot more expensive than a plain resistor though, cheapest is Schuro in Germany, 12.37 Euro ex. for a 2.2 mH/0.12 Ohm.
(imo, still a very good investment for the returns, 300mV ripple is not a healthy thing for your PS capacitors)

 

[jacco vermeulen]

Sorry Nick, i was just reading Wim's posting.
(anyone here can tell you i am a nut with a certificate to proove it)
That, and i should be wearing my reading glasses, sitting on the computer.

 

[ElectroNick]

I'll go shopping for some high-power resistors.
Cheaper than buying those exotic coils....

Will get back on this tonight (hopefully)

Grtz,
Nick

 

[ElectroNick]

I did a test with the progam "PSU Designer II" and came to it that i should use a CRC power supply.

I added 2 x 68000uF and 2 x 0,47Ohms to the existing 4x47000uF caps.
The humm is a lot less, still something audiobile though....

This week i'll create a new capacitor bank with those stubbies i have laying around

My idea is to use CCRC ( all 68mF and 0,47Ohms)

Keep you posted....

Grtz,
Nick

 

[rinox]

I don't know if you have tried but for me the best solution is to make a stellar ground to eliminate any ground loops.... simply use the chassis for the ground, I'm sure you' ll resolve the problem.

Off topics: I loooooooooooooove The Netherlands, simply incredible place and a lot of lovely folks.

 

[Fox]

Be sure that the love goes both ways, especially when it concerns your pastas and pizzas

 

[ElectroNick]

@ rinox

i know grounding is important, but my problems are not related to ground-isues.
A test with a multichannel scope reveilled a hum (100Hz) in phase with the ripple on the power caps.

I made a little error while calculating the wattage of those resistors.....

I2xR gives me over 10W

So.......

Grtz,
Nick

ps : anybody had problems with "normal" rectifiers ? I hope no special care is needed for those guys !

 

[acaudio]

[Bps : anybody had problems with "normal" rectifiers ? I hope no special care is needed for those guys ! [/B]

have a look at single pulse max.peak. (turn on!), or use a secondary softstart or inductor/resistor in series with rectifier

Adam

 

[jacco vermeulen]

I2xR gives me over 10W

Why those coils make sense !
Why dont you flogg a couple of those big 68000 cans and buy coils to build a CLC ?
(imo) with the ripple of a CRC from the bias current of the Aleph 5 it is a shame of those expensive capacitors