What is EI72? 7x2 cm coil crossection in the laminations?
Anyway, that's certainly too large for me; I'd like about 1 mH, as the capacitance multiplier in the next stage takes leftover ripple down several orders of magnitude.
Anyway, that's certainly too large for me; I'd like about 1 mH, as the capacitance multiplier in the next stage takes leftover ripple down several orders of magnitude.
MCM Electronics carries air core inductors that i've used before. I just checked and they have 1.00 mH and 1.50 mH in stock. The part i used
was the 2.00 mH that Mr. Pass recommended in the SOZ article. Some people complain that they look cheap, but they've worked fine in my ZEN, Aleph 2, and Aleph-X amps.
MCM Electronics
just do a search for air core inductor.
was the 2.00 mH that Mr. Pass recommended in the SOZ article. Some people complain that they look cheap, but they've worked fine in my ZEN, Aleph 2, and Aleph-X amps.
MCM Electronics
just do a search for air core inductor.
An air cored inductor would need more turns and thus would have larger DCR for the same wire gauge.
Any help calculating EI core for a 1 mH? I have access to various old transformers as well as a manual winder.
Any help calculating EI core for a 1 mH? I have access to various old transformers as well as a manual winder.
Hi
I started out with 47mf 0.11 Ohm 47mf 0.11 Ohm 47mf.
With 9A and the resistors get realy hot.
Then I change to a I Coil from intertechnik 1.5mH
http://intertechnik.de/index.html/J...lMjZiJTNE.html?basis=78&detail=3761&suchwort=
The temperature of the coil is 100 C and I have 20mVTT rimple at 9A
Rob
I started out with 47mf 0.11 Ohm 47mf 0.11 Ohm 47mf.
With 9A and the resistors get realy hot.
Then I change to a I Coil from intertechnik 1.5mH
http://intertechnik.de/index.html/J...lMjZiJTNE.html?basis=78&detail=3761&suchwort=
The temperature of the coil is 100 C and I have 20mVTT rimple at 9A
Rob
For my Aleph-X's I used the Hammond 156B Open Choke. 1.5mH 0.07ohm, rated for 5A. Cheap and relatively small too.
Rob, what was the power of your 0.11 Ohm resistor ?
I want to use 2 resistors (CRCRC), one 1.5Ohm / 50W and one 1Ohm / 50W. It is less expensive than a choke (for me). (about 50€ for the resistor and the heatsink and for 2 amp with 4.5A of bias).
The ripple will be of 2mV.
I want to use 2 resistors (CRCRC), one 1.5Ohm / 50W and one 1Ohm / 50W. It is less expensive than a choke (for me). (about 50€ for the resistor and the heatsink and for 2 amp with 4.5A of bias).
The ripple will be of 2mV.
Hi,
are you shure it is less expensive? You´ll need a bigger transformer, bigger heatsinks and you will draw more current (so your electricity bill will be higher). The temperature inside your case will also be higher.
The Torobars cost around 13€ a piece depending on source and will give a better result.
William
are you shure it is less expensive? You´ll need a bigger transformer, bigger heatsinks and you will draw more current (so your electricity bill will be higher). The temperature inside your case will also be higher.
The Torobars cost around 13€ a piece depending on source and will give a better result.
William
Hi william and Thanks for your repply,
If the torobar is at this price, that's great !
But Is it easy to buy it ? (for france)
What model do you advise me for 4.5A / 20V and 50mV ripple max ?
If the torobar is at this price, that's great !
But Is it easy to buy it ? (for france)
What model do you advise me for 4.5A / 20V and 50mV ripple max ?
Hi,
the 2.2mH would be enough. You could probably even go for the 3.3mH but I don´t think this is necessary.
You can have a look with PSUdesigner to see what the difference would be.
I´m not shure if they are easy to buy in France. Just try. If it doesn´t work I could order them and sent them to you but this would cost twice the postal fees......
Be shure to use the right values for the impedance of the caps and transformer. If you want I could sent you the file from my Aleph-X psu.
William
the 2.2mH would be enough. You could probably even go for the 3.3mH but I don´t think this is necessary.
You can have a look with PSUdesigner to see what the difference would be.
I´m not shure if they are easy to buy in France. Just try. If it doesn´t work I could order them and sent them to you but this would cost twice the postal fees......
Be shure to use the right values for the impedance of the caps and transformer. If you want I could sent you the file from my Aleph-X psu.
William
Thanks,
I will try to buy it.
You can send me your Aleph-X psu file.
What do you want to say when you're talking about the impedance of the caps ?
the ESR ?
I will try to buy it.
You can send me your Aleph-X psu file.
What do you want to say when you're talking about the impedance of the caps ?
the ESR ?
I've found this :
http://www.riviera-acoustics.com/catalog/product_info.php?products_id=911&language=en
It's a 2.2mH HQ-Ferrite Core Inductor 2.01mm² with
an impedance of 0.1Ohm.
Is it correct ?
(Thanks for your PSU file)
http://www.riviera-acoustics.com/catalog/product_info.php?products_id=911&language=en
It's a 2.2mH HQ-Ferrite Core Inductor 2.01mm² with
an impedance of 0.1Ohm.
Is it correct ?
(Thanks for your PSU file)
Hi,
I´m not shure these work. It is important that the saturation current is high enough. The Torobars have one over 10A.
You must look at the intertechnik site for more technical details.
William
I´m not shure these work. It is important that the saturation current is high enough. The Torobars have one over 10A.
You must look at the intertechnik site for more technical details.
William
I see.
Is it this one you advise :
http://www.intertechnik.de/index.ht...MjZiJTNE.html?basis=71&detail=46471&suchwort=
Is it this one you advise :
http://www.intertechnik.de/index.ht...MjZiJTNE.html?basis=71&detail=46471&suchwort=
yes,
that´s the one. I just had a look myself but this is the only coil they spec the saturation current (11,7A) for (in the german pdf).
I know I looked quite a long time before I bought them.
William
just found the value for the HQ58 in their catalogue: 6.98A
This could be enough although I don´t think they specify for DC current.
that´s the one. I just had a look myself but this is the only coil they spec the saturation current (11,7A) for (in the german pdf).
I know I looked quite a long time before I bought them.
William
just found the value for the HQ58 in their catalogue: 6.98A
This could be enough although I don´t think they specify for DC current.
HI
I would like to ask for help from those who also used the Kristijan type pc boards for the Aleph X .
I'm in the proces to put these the amp together , I already have the transformer , I put together the heatsinks , I populated the pc boards . Just I have to mount the transistors , mosfets and ready to fire it up .
I would like to know wich transistors , mosfets must be matched using the Kristijan boards , and how close to match .
Thanks
Regards
I would like to ask for help from those who also used the Kristijan type pc boards for the Aleph X .
I'm in the proces to put these the amp together , I already have the transformer , I put together the heatsinks , I populated the pc boards . Just I have to mount the transistors , mosfets and ready to fire it up .
I would like to know wich transistors , mosfets must be matched using the Kristijan boards , and how close to match .
Thanks
Regards