Making car amplifier SMPS with tl494 + DC Protection

[leinahtan]

i made the same SMPS TL494CN based but why is it that my toroidal core heats up and i mean hot

can anyone post some pictures of your transformer so that i may have some idea about it

i am beginning to lose my patience and almost 10 pcs of different sizes was used but cant find the bastard problem.

pls help

 

[2pist]

Whats your switching frequency?

 

[raidfibre]

You need less flux density in your core. It is saturating.

 

[leinahtan]

my switching frequency is 50khz at pin 5 of TL494

here is the schema by the way

its from jbl actually been posted long time ago

 

[palesha]

Can't see thumbnails.

After i shut down Zone alarm pro, i am able to see thumbnails.
How to on Zone alarm pro & also see thumbnails?

 

[shon35us]

Zip files

I can't seem to open any of them. I thinking about doing something like what you have built but using the LM3886 chips, all though I'm not sure if this is a good idea

 

[shon35us]

Where con you buy the core at?

You stated that you use an ETD core, from where, I did a google search and came up with like 10,000 hits. Any suggestion?

 

[luka]

try to find your local dealer, or as many do: order them on internet.

 

[luka]

try farnell

 

[ThSpeakerDude88]

ok I'm ready to build one of these....


I want to power a gainclone type amp with it.

I'll need , +/- 30v right? I will only need a 300 watt psu or so, as I am only gonna need 60 watts per channel ( x2 ) but I might want to add two more channels.
I can't decide on a design.. I have seen a few variations online. Is Rod Elliots good? ( I trust his projects a lot, just making sure though) will the toroid core he sugguests work ok for this wattage?


Also, how in the world can you make a pcb for something like this?

as I understand, the tracks need to be huge to carry the amount of current needed. Id be using radio shack copper pcbs and home etchant...if thats a good idea, if not ill send out to have some made.

 

[2pist]

Thats exactly what I did. Except Radio shack only has double sided board around here so I ordered some online. If I still had a functioning scanner I would upload my artwork. I used Rod's design and it works great.

 

[moray james]

TL494 SMPS schematic

Please see attached file. ddd

 

[MHFidelity]

and if I wanted a which trsformatore escape to 420v 200mA using and like?

 

[kalmara]

Hello, I want to ask for the file smps.zip...
What is the maximum power of this SMPS with only one IRFZ44N on each rail, and how can I calculate the windings for the ferrite trafo (can I use R34-Kashke ?) for my voltages (ex. +/-35V) ?

 

[sachserjuris]

Protel viewer

Dear Mr. Risto80

Congratulations!! Great page about TL494 and SMPS. I build some projects too. But, in this moment, I need the Protel viewer. How can I do to download it?

Thank you very much.

Sachserjuris

 

[sachserjuris]

ESP SMPS

Hello Mr. Sergio

Very good your SMPS design with SG3525. I build it, but only with four IRFZ44N less regulation and old toroid of car amp. I want build eight mosfets. No problem with drivers??

Thank you very much.

Sachserjuris

 

[luka]

For eight mosfets you will need buffers for driving gates. One for each side.

 

[sachserjuris]

Buffers

Hello Mr. Luka

The SG3525 is driving the Mosfet gates with NPN/PNP BC547/557. Is it the buffer you talk? It´s the same drivers in Sergio´s design in ESP what I use. About Protel format/viewer software, do you Know how I do to free download in the WEB?

Thank you very much

Sachserjuris
From Brazil

 

[luka]

yes this two tranzistors are buffers, needed for larger gate capacitance, larger current is needed for same results.

What kind of files do you need to see?
I hope this will help

 

[sachserjuris]

valveaudio

Dear Mr. Luka

I want to download the valveaudio archives in protel format.
It´s dowloaded in html format and don´t in protel. Why this!!
I don´t understand. Help me.

Thank you very much.

Sachserjuris