I will try to find T130-2 (ebay). From my calculation uH=(Al x turns^2)/1000
20uH=(11 x 43^2)/1000, then I need 43 turns on this core?
Thanks
20uH=(11 x 43^2)/1000, then I need 43 turns on this core?
Thanks
I find in my contry ferite cores
1)HD12412
2)HD32283
3)HSD3606
4)HSD3622
Can I use any of them for uotput coil?
Thanks, Nikola
1)HD12412
2)HD32283
3)HSD3606
4)HSD3622
Can I use any of them for uotput coil?
Thanks, Nikola
I want to know friends place in the use of test triangle wave, square wave frequency is much。
This frequency adjustment element is.
This frequency adjustment element is.
I have no idea what are they, Google finds nothing. You should provide a link or a description!
Yes.
Those seem to be inductors, not cores. Maybe ferrites, but i'm not convinced. If they are really ferrites, you have to brake them parts.
Dzony988:
Have you measured your switching freq yet? The original schemetic with the original phase lead network gives a switching freq of 120kHz. The corner freq (-3dB) of your filter is about 50kHz (at 4.5 Ohm), this means about 20dB filtering only, very poor. The 1mm gap could be enough to protect your core from saturation, but you can have a very high ripple current at the inductor.
Have you measured your switching freq yet? The original schemetic with the original phase lead network gives a switching freq of 120kHz. The corner freq (-3dB) of your filter is about 50kHz (at 4.5 Ohm), this means about 20dB filtering only, very poor. The 1mm gap could be enough to protect your core from saturation, but you can have a very high ripple current at the inductor.
Lorylaci:
I dont know my switching freq, because i don't have osiloskope or other instruments... In original schematic output filter has 30uH and capacitor 1.5uF. On my amp output filter has 20uH (24 turns on t106-26 with gap 1mm) and 1uF. Output coil and core are very very hot (on high power on 4ohms speakers with +-50V, output coli after several minutes begins to smell the heat).
Sound is great, output transistors are cold even on high power and I have full audio spectar.
What are you suggest that I do?
Important to me is a great strength, a little heat and a full range of audio spectar and classic sound quality, I dont need absolute Hi-Fi, I need for the parties 🙂
Thanks
I dont know my switching freq, because i don't have osiloskope or other instruments... In original schematic output filter has 30uH and capacitor 1.5uF. On my amp output filter has 20uH (24 turns on t106-26 with gap 1mm) and 1uF. Output coil and core are very very hot (on high power on 4ohms speakers with +-50V, output coli after several minutes begins to smell the heat).
Sound is great, output transistors are cold even on high power and I have full audio spectar.
What are you suggest that I do?
Important to me is a great strength, a little heat and a full range of audio spectar and classic sound quality, I dont need absolute Hi-Fi, I need for the parties 🙂
Thanks
Dzony988:
In the feedfack, try to change capacitor C1 (330p, mica) to 150p or 100p (you can use ceramiic or anything). This should turn your switching freq from 120kHz to about 200-230kHz. This would improve filtering from 20dB to about 30dB.
In the feedfack, try to change capacitor C1 (330p, mica) to 150p or 100p (you can use ceramiic or anything). This should turn your switching freq from 120kHz to about 200-230kHz. This would improve filtering from 20dB to about 30dB.
Ok, I'll do this. And with that changes, can I use my output coil 20uH with 24 turns gap 1mm T106-26 and output cap 1uF, whether the temperature is reduced?
Thanks
Thanks
Did somebody designed short Circuit / Overcurrent and Undervoltage protection.
Does somebody have ideas ?
I think this should be important !
Does somebody have ideas ?
I think this should be important !
Pafi, man, you cant belive where I live. 😀
I can find anything, tube 70 yeras old but iron powder or ferite no. We still live in the middle eighties 🙂)
I will try to break up PC ferite core
I can find anything, tube 70 yeras old but iron powder or ferite no. We still live in the middle eighties 🙂)
I will try to break up PC ferite core
In the middle eighties I disassembled TVs from the 60's, and I found ferrite cores in it...
Good decision! Heat it first!
Hi Pafi,
can you make a measurement of your ferite EE core. i got below sketch of my E core
thanks,
coolet
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