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Old 17th March 2005, 04:14 PM   #1
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Default My car audio amplifier

Hi!

This is my first car audio amplifier prototype, it's based on the TL598 pwm controller and the OPA549 power op-amp, supply rails run at +/- 29V (regulated), the heatsink/chassis can't disipate the heat for long periods at rms-power tests, but the amplifier can deliver 75Wrms@4ohms for a short time.

The pictures are very bad, but at least shows the amplifier



Click the image to open in full size.


Click the image to open in full size.
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Old 18th March 2005, 05:17 PM   #2
TO-3 is offline TO-3  Peru
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Looks good. Do you have a lid? I'd put a fan on it and use forced-air cooling. Maybe that will help.
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Old 19th March 2005, 11:39 PM   #3
JZatopa is offline JZatopa  United States
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That looks great!!! I second the fan idea. Use a small fan and underpower it so it is quieter. You could even use two in a puch pull configuration.

How does it sound?
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Old 20th March 2005, 02:27 AM   #4
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It is very beautiful and simple as it should be.

If you can make a amplifier to give 800watts rms at 4 ohms i will buy it
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Old 20th March 2005, 02:28 AM   #5
JZatopa is offline JZatopa  United States
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If he could get 80wrms a chan. and make it sound great I would love to try to build something like this.
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Old 22nd March 2005, 06:32 PM   #6
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In a few days I will reply in more detail, sorry, this days I can't.


Greetings from Mťxico.

Juan Carlos
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Old 24th March 2005, 03:16 PM   #7
TO-3 is offline TO-3  Peru
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I should have seen this before. Do you have hold-down bars for your power devices? You probably won't even need a fan(o dos) if you can press those bad boys to the sink.
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Old 31st March 2005, 06:31 PM   #8
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Quote:
this days I can't
Sorry, I meant ďthese daysĒ


Yes, I have a lid for the amplifier (and better pictures):

Click the image to open in full size.


The lid assembly isnít finished yet, thatís the reason why you donít see any screws .

A fan isnít considered because at normal listening tests (music) the amplifier doesnít get too hot .


How does it sound?, mmm, I can only say that sounds good to me, youíll see I donít have much listening experience with ďreference equipmentĒ, also as you can read, my english is not good (not as good as I wish) so, I have a lot of ideas that I donít know how to translate properly (Iím working on it but any help will be welcome).


I do have bars to press the power devices (the pictures in the first post shows an unfinished interior)

Click the image to open in full size.

The bad news:

The supply was not stable (at 1Khz and producing 75Wrms@4 ohms on a single channel it was), I did the feedback compensation wrong (anyway it is only a prototype so it worked for that purpose) and burnt the mosfets twice (one time at continuous power test, trying to get the same 75Wrms@4ohms but this time at 20Hz and the other at full music power test with both channels driven), so a new design is coming soon.


Juan Carlos
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Old 31st March 2005, 08:15 PM   #9
maylar is offline maylar  United States
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Very nice. What did you use for a fuse socket?
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Old 4th April 2005, 03:54 PM   #10
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I took the fuse socket idea from an old sony amplifier.

With a couple of faston connectors like these:

Click the image to open in full size.


I removed the plastic cover, soldered a pair of wires (as indicated in the next picture) and bended the part "a" and the wires so I could solder the connectors in a through hole fashion.

Click the image to open in full size.


That way, the socket (or better said each connector) is fixed firmly to the pcb
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