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Old 7th April 2004, 10:25 PM   #11
Risto80 is offline Risto80  Macedonia
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Thumbs up About Feritte turns

Hello

1.The output voltage depens os turns on feritte core.The
calculating is this Ns/Np=Vo/8,8
Were:
Ns-Secondary voltage
Np-Primary turns usualy 4x4 turns
And you will get 13.6 turns better 2x14 turns

2. The 4n35 is a voltage regulator,You can not take off becous the schematic of smps is based on 4n35.You can use other schematic of smps and then you can not use 4n35 but the schematic about sg3525 is different.

I use this amplifier about 5 mounts for my subwoofer 300W and is sound very good,like my car amplifier Kenwood-719.No difference in sound ,just put input fuse about 15A and secondary fuses about 3 Amps.And some kind of speaker protection like dc-protection
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Old 7th April 2004, 11:27 PM   #12
Grucho is offline Grucho  Croatia
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Default Re: About Feritte turns

Hi.

Can you tell me why have you separeted primary ground (battery ground) and secondary ground ?

Secoundary ground is connected to amplifier ground, and amplifier ground is connected to input audio cable ground, and input audio cable ground is conected to battery ground trough CD-player.

heh I hope you understand what I'm talking about .
You have : Sec.gnd->Audio.gnd->Batt.gnd .
So why not connecting them directly at PCB ??

Greetings from Croatia
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Old 8th April 2004, 04:41 AM   #13
tool49 is offline tool49  Canada
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Hi, nice work!

I have a question concerning the filter inductor. I got some ITL501 core to do the transformer somewhat similar to the one you've built, but I can't seem to find any good high current filters. What are the ones you use? To be able to get around 350W out of the power supply, the input filter inductor needs to be able to conduct a whoping 30 amps. For the output filter, the current is still high overing around 5A but way easier to find already made filters from the likes of Digi-Key.

On another note, in the schematic, the base of the transistor in the 4N25 isn't connected to anything, is this right? Shouldn't it be connected to ground?

Thanks,
Sébastien
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Old 9th April 2004, 09:46 PM   #14
Grucho is offline Grucho  Croatia
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Hi.

I use filters from old PC power supply.
Check http://valveaudio.tripod.com/ , for calculations.
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Old 11th April 2004, 04:09 AM   #15
tico70 is offline tico70  Costa Rica
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Default ITL501 free samples

Hey guys...I visited the WILCO website and they are offering samples of the ITL-501 toroid...they will give you 5 samples (good isnt )

According Rod Elliots website, this core can be used for the SMPS trasnformer.

I ordered my samples today lets see if they send them.
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Old 14th April 2004, 12:13 AM   #16
Risto80 is offline Risto80  Macedonia
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Thumbs up Re:Conect primaru ground with sek.ground?

Hello

For input and output filter you can use cores from old pc supply.
And for connecting the primary ground and secondary ground direct on PCB is not corect. Becouse Direct DC ground can lead to storing/whine.
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Old 14th April 2004, 12:38 PM   #17
Grucho is offline Grucho  Croatia
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Hi Risto80.

Can you send audio amp schematics ?


Greetings
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Old 17th April 2004, 06:03 PM   #18
Risto80 is offline Risto80  Macedonia
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Default Car Amplifier schematic+Preramplifier

Ok here it is the car amplifer schematic + preamplifier
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Old 17th April 2004, 11:40 PM   #19
Grucho is offline Grucho  Croatia
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Hi.

Thanks for schematics, very simple

I have couple of questions .

1) How is this your amplifier good for normal speakers, not subwoofers .

2) I noticed that your schematics and pcb of smps are different in one inductor. You are using one separate inductor only for supply for sg3535 . Why is that ?

I ask that beacause whithout that inductor I'm having problems, one capacitor even exploded here and sg3525 got dead But that happened with heavy load on spms .

Also I have feeling that sg3525 is having problem with direct driving mosfets . I think Ill use transistors to drive mosfets in my new pcb.

Bye
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Old 18th April 2004, 12:35 AM   #20
Risto80 is offline Risto80  Macedonia
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Thumbs up Re Questions

1.This amplifier is good for any speacker.I used for subwoofer becouse the output tranzistors are very strong-150W.I you like to use with car speakers about 200W per speacker you can use smaller output tranzistors like tip35c/36c,the supply is the same.If you like to use this amplifier in bridged mode on 4ohm speacker the supply can be +/-25V.
2.Yes on schematic I hevent put the inductor for sg3525.This inductor is 100uH and is recomendet for suppluing the sg3525.With this inductor the whole smps is more stable.
3.If you use just two pairs of irfz44n or buzz1 you can use direct from driving from sg3525.But if you use more then 3 pairs you can use tranzistors.Download this smps pdf document and use that kind of tranzistors.
4.Grucho do you have any car amplifier schematic,or car amplifier service manuals about Kenwood.If you have please send me on my e-mail risto44091@hotmail.com.Then I will send you lot of matirials for making car amplifier.

Sorry for my bad english
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