Have a look at the datasheet of the Talema CM chokes. It specifies an inductance at 10 kHz - for good reason. I seriously doubt you will get any useful inductance at 50 Hz from those babies. Remember: Those coils get their large inductance from a trick: The two reverse currents form two magnetic fields which compensate one another, and the resulting field ist very low - so you can get large inductances with tiny, but highly permeable cores. This will work for low energy high frequency stuff, but I doubt it will do as a ripple killer.
I can measure inductance at several frequencies and look but i think you are right. The ferrite material is optimized for higher frequencies so back they go, BEFORE the diodes.
I think we have discussed that before. Anyway, an CLC filter can be setup with common mode chokes but i am afraid the core has to be from iron or even better audio range material.
I think we have discussed that before. Anyway, an CLC filter can be setup with common mode chokes but i am afraid the core has to be from iron or even better audio range material.
I am on my way to find the Onkyo common mode supply. It is described in this file but the
"more2 button that promises to describe the circuit does not work..Onkyo Grand Integra M-510 on TVK
"more2 button that promises to describe the circuit does not work..Onkyo Grand Integra M-510 on TVK
Here is some more. Can not find a circuit diagram though. Had it some years ago.ONKYO Grand Integra M-510
I do filter after the rectifiers. See my picture of the Opus Magnum Preregulator.
If that makes a big difference i can not tell. I only heard the Paradise that way.
The on board regulation is extremely well engineered by Frans so. You can expect excellent results without enormous precautions. On the other hand you will be astound what some will build. Holger´s multiple CLCLC for example. Andres is even working on a battery supply ! And that despite the HQ shunts, RC on board, current mirrors and other measures that make the Paradise technically immune to PSU ingress. Everybody will tell you that his solution is the best and so it should be. Have fun !!!!
If that makes a big difference i can not tell. I only heard the Paradise that way.
The on board regulation is extremely well engineered by Frans so. You can expect excellent results without enormous precautions. On the other hand you will be astound what some will build. Holger´s multiple CLCLC for example. Andres is even working on a battery supply ! And that despite the HQ shunts, RC on board, current mirrors and other measures that make the Paradise technically immune to PSU ingress. Everybody will tell you that his solution is the best and so it should be. Have fun !!!!
ONKYO M-510 Service Manual free download,schematics,datasheets,eeprom bins,pcb,repair info for test equipment and electronics
Here you can download the service manual. The common mode coils are visible but the circuit diagram is jammed. I had a very nice simplified schematic that also had a good explanation. Sorry, i lost it or can not find it. Cello used coils in the PSU of Power Amps too. This is very effective but expensive so rarely seen.
Here you can download the service manual. The common mode coils are visible but the circuit diagram is jammed. I had a very nice simplified schematic that also had a good explanation. Sorry, i lost it or can not find it. Cello used coils in the PSU of Power Amps too. This is very effective but expensive so rarely seen.
I am far from stating mine is the best solution but using a simple hexfred bridge before 15000u smoothing Nichicon caps allready makes it sing.
I believe some coils would improve on this thou.
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Now a different story... I am using an old Micro TT that I found in the house I am now living in... It needed some work ... cleaning, new belt, bearing tightening and motor refurbishing. Now it works and sounds very good indeed. It is a very well built machine but an entry level with a very torquy motor that produces some vibration and noise.
Today I decided to experiment it connected to my Ricgeddon (a 220 to 110v 500VA toroid followed by some resistors to lower mains from 220 to around 80vac).
Now the platter takes some more time to reach full speed but does not need a hand start. The good news are: I do not hear or feel any more motor noise.
Results are incredible... micro detail much more aparent, bass more pronounced and a sense of ease on the presentation.
Those who have ac motors should try this simple trick... it is incredibly effective.
Today I decided to experiment it connected to my Ricgeddon (a 220 to 110v 500VA toroid followed by some resistors to lower mains from 220 to around 80vac).
Now the platter takes some more time to reach full speed but does not need a hand start. The good news are: I do not hear or feel any more motor noise.
Results are incredible... micro detail much more aparent, bass more pronounced and a sense of ease on the presentation.
Those who have ac motors should try this simple trick... it is incredibly effective.
I also found a violin hehe
It seems no one cares about turntables around here and this is really a rare find.
PS: I believe the idea to reduce AC voltage came from Naim for the Linn.
It works perfectly with Rega TT also.
It is incredibly effective.
PS: thank you for for the talema tip. I will try it and report the results.
It seems no one cares about turntables around here and this is really a rare find.
PS: I believe the idea to reduce AC voltage came from Naim for the Linn.
It works perfectly with Rega TT also.
It is incredibly effective.
PS: thank you for for the talema tip. I will try it and report the results.
Had another thought on this common mode choke thing and talked to a good friend of mine, someone who knows a lot more about chokes than me.
To put it short: Forget it. You can't use common mode chokes in the DC section of the PSU (aka behind the rectifier).
The reason for this is simple: common mode chokes are for filtering common mode components. The ripple currents on the plus and the minus lines of a PSU aren't common mode - they are just the opposite (given an identical load in both lines). So you might have the brillant idea to reverse one of the coils to have common mode ripple.
The problem is: if you do so, you also reverse one of the DC currents through the core. So both DC components won't compensate any more, they will add up.
Which leads to massive saturation of that tiny core. Result: Your inductance is gone. Your common mode choke won't do any harm, but it won't have any effect on the signal at all.
Forget about common mode chokes, use seperate chokes for each of the two power lines.
To put it short: Forget it. You can't use common mode chokes in the DC section of the PSU (aka behind the rectifier).
The reason for this is simple: common mode chokes are for filtering common mode components. The ripple currents on the plus and the minus lines of a PSU aren't common mode - they are just the opposite (given an identical load in both lines). So you might have the brillant idea to reverse one of the coils to have common mode ripple.
The problem is: if you do so, you also reverse one of the DC currents through the core. So both DC components won't compensate any more, they will add up.
Which leads to massive saturation of that tiny core. Result: Your inductance is gone. Your common mode choke won't do any harm, but it won't have any effect on the signal at all.
Forget about common mode chokes, use seperate chokes for each of the two power lines.