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Making car amplifier SMPS with tl494 + DC Protection
Making car amplifier SMPS with tl494 + DC Protection
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Old 30th August 2004, 08:23 AM   #121
Spiro007 is offline Spiro007  Australia
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Hi risto
I do not have any ready designs for sub woofer but have software. let me know your speaker parameters, and i can post the box for it.
Also I built your SMPS, very good will run without heatsinks on the mosfets without load, no heat until load.
I am using mosfets IRFZ48N /0.018ohms 50 AMPS. But the capacitance on the gate is high. can I replace the 100ohm resistors with something smaller like 47 ohms or even less??

Thanks
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Old 30th August 2004, 11:10 PM   #122
Risto80 is offline Risto80  Macedonia
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Question Hello

I plan to by USBLASTER speacker 12 inch. its only 35 euro.
The only things I know about this subwoofer is from the usblaster site the name for this sub. is usb-2932.Specifications are:
Size 30 cm
Dual voice coil sub
Max. Input power 2000 W
Rated Input power 400 W
Sensitivity 90 dB
Frequency response 22 Hz-1 Khz
Impedance 2x4ohm

With Inductance loop
Edge Rubber surround
Cone Injection
Magnet 50 Oz
Please sorry for my bad english but I dont know what is capacitance?
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Old 31st August 2004, 04:30 AM   #123
2pist is offline 2pist  United States
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Spiro, I use a similar design with 4 IRFZ20's driven directly from a SG3525 and use 47 ohm gate resistors and it works great.

Risto, Capacitance is the property of an electric conductor that characterizes its ability to store an electric charge. So using a lower value resistor can increase switching efficiency by decreasing the effect that gate lead capacitance has on switching times.
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Old 3rd September 2004, 02:50 PM   #124
Caiofrv is offline Caiofrv  Brazil
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Default Congratulations!

Congratulations Risto! Very nice project! How much cost your AMP?
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Old 4th September 2004, 06:06 AM   #125
2pist is offline 2pist  United States
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Here is a pic of my latest smps complete with transformer purchased from Zagisrule on this forum.
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Old 4th September 2004, 06:10 AM   #126
2pist is offline 2pist  United States
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Here's the amp almost finished!
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Old 4th September 2004, 08:02 AM   #127
di4kata is offline di4kata  Bulgaria
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Hi Risto! I'm interested in the schematic for the pcb you have recently posted and the specification for it
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Old 5th September 2004, 09:04 AM   #128
robin2d is offline robin2d  Bangladesh
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Default How to build Feritte toroid 4 SMPS with tl494+DC protection

there is a feritte toroid in SMP Sschematic . I did not know hou to making this Feritte toroid core . I want to build SMPS for 300w-400w car amp.

I have some unused PC power supply (230v 235w 4A) and i see some(3) core there (see attach pic). my question is
is this feritte toroid ?
and may i use this feritte toroid in SMPS without modefication?
There is 3 feritte toroid and which one i can sued? (biggest one?)

Any one suggest plese.

Regards
Robin
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File Type: jpg f core# 1.jpg (36.6 KB, 3597 views)
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Old 5th September 2004, 12:50 PM   #129
djQUAN is offline djQUAN  Philippines
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the cores are too small for a SMPS. even the biggest one is still too small. you need a core of atleast 1.5" in diameter for a 200 watt PSU.

and also, the cores are powdered iron. you need ferrite. the toroids you mentioned can be used as input filtering so that your amp SMPS will not put spikes or noise into the car electrical system.
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Old 5th September 2004, 08:40 PM   #130
raidfibre is offline raidfibre  United States
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The cores are designed to be used for DC filter inductors, as their yellow color code indicates.
If they were the right type, the power handling ability would be more dependent on switching frequency rather than "how big it is"
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