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
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
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
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
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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)
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)
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
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
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.
Off topics: I loooooooooooooove The Netherlands, simply incredible place and a lot of lovely folks.
@ 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 !
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 !
ElectroNick said:[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
Attachments
ElectroNick said: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
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