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Old 14th November 2002, 11:03 PM   #21
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Going with 4mH air core inductors for the above PS could be very expensive. The only way I can see to keep inductor DCR very low is to go with 12 guage foil inductors that are about $49 USD a piece. Click the image to open in full size.

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Dan
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Old 14th November 2002, 11:06 PM   #22
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Sorry, here is the link I messed up.

Foil Inductors

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Dan
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Old 14th November 2002, 11:20 PM   #23
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I will do the same with my PS for my Aleph 4.

4 x 3.9mH = $200


Good things are costly.

Trigon.
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Old 14th November 2002, 11:29 PM   #24
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Good things are very costly! $200 USD will be $320 in Canadian Tire money plus PST and GST = $370CAN.

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Dan
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Old 14th November 2002, 11:35 PM   #25
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Quote:
Originally posted by dantwomey
Going with 4mH air core inductors for the above PS could be very expensive. The only way I can see to keep inductor DCR very low is to go with 12 guage foil inductors that are about $49 USD a piece. Click the image to open in full size.

Regards,
Dan
Hi,

I am planning to build my Aleph5 with dual mono power supply (500 VA 30 V trafo + 8 * 22000 uF/63 V for each channel)

If I use the powercircuit of Kristijan ( http://web.vip.hr/pcb-design.vip/power-5.html ) I guess I need 2 air cores of 3.9 mH for each channel (so 4 in total).

What quality must I buy? I can buy a 1.4 mm 3.9 mH air core (0.67 ohm) for 11.50 euro (about $11) at my local speaker buildingshop. Isn't that good enough?

A 2 mm air core (0.40 ohm) will cost me € 29.50 euro each

I could also buy something called "ferrocore" which will cost me euro 9.50 (1.4 mm, 0.33 ohm).
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Old 14th November 2002, 11:37 PM   #26
fcel is offline fcel  United States
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Trigon,
I've read that for those old (never used) capacitors, initially you charge it up slowly or something of that saying.
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Old 14th November 2002, 11:43 PM   #27
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Slightly off topic. It seems that a well known amplifier manufacturer has a different point of view on dual power supplies.

"The 350A utilizes a dual mono design topology. This gives the amplifier better isolation between channels. Soundstage imaging is improved, offering true soundstage width and depth. Instrument placement and layering are more accurate. Each channel shares a common 2000 VA toroidal transformer. By using a larger sin-gle transformer, rather than 2 smaller ones as in typical dual mono designs, stronger and cleaner bass is maintained."

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Dan
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Old 14th November 2002, 11:56 PM   #28
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Good things are very costly! $200 USD will be $320 in Canadian Tire money plus PST and GST = $370CAN.

Dan that's it For couple of Amps that should do it.

By using a larger sin-gle transformer, rather than 2 smaller ones as in typical dual mono designs, stronger and cleaner bass is maintained."

Dantwomey I will be using PLITRON 1.5kW 2 x 40V for each channel of my Aleph 4


I've read that for those old (never used) capacitors, initially you charge it up slowly or something of that saying.

Fcel Yes I will try to do the exact same thing, run the setup with resistor and DC (battery) and charge them slowly and discharge them again trough the resistor. This will do the job I hope.

Trigon
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Old 15th November 2002, 01:06 AM   #29
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Quote:
Originally posted by trigon
Good things are very costly! $200 USD will be $320 in Canadian Tire money plus PST and GST = $370CAN.

Dan that's it For couple of Amps that should do it.

Trigon,

If this is the case, you should seriously consider using better caps and spend your money there and not on coils. What about nice Nichicon Super-Throughs, possibly the best large electrolytic capacitor made today? This way your Canadian Tire money will be better spent and the sonic improvement will be greater too. Those inductors are nice to use in speaker networks, but overkill IMO in power supplies. BTW, I still have 4 of them sitting in my drawer (2uH).
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Old 15th November 2002, 01:18 AM   #30
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Hi Peter.

What would you recommend for 3.9mH aircore inductors in PS for Alephs. I would greatly appreciate advice and saved money for Nichicon Super-Throughs caps.

Trigon.
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