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Chip Amps Amplifiers based on integrated circuits

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Old 28th September 2003, 01:34 PM   #21
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Maybe you should try posting this kinda stuff in the SMPSU section...I dun really like to deal with them...and I haven built or tried one yet...so before I continue...get your PSU up and running good first...I also see that you like to post in the SwitchMode Group...(yahoo)...I currently have an account there...perhaps you can post and get answers there..while I chip in to help a bit...most importantly ...get the PSU section up and running...an Amp without a PSU is like a car without an engine...
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Old 28th September 2003, 01:38 PM   #22
MaXiZ is offline MaXiZ  Italy
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Quote:
an Amp without a PSU is like a car without an engine...
Right.
Thanx for ur help anyway!
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Old 28th September 2003, 01:52 PM   #23
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I would think ur amp is ok...but the PSU section is broken from the pics you posted..perhaps you can post some pictures of ur SMPSU...or izzit on another thread?? Maybe you can get a cheap0 4A 2x 30VAC Trafo...doesn't have to be really good...rig up a simple PSU...with some caps and a rectifier...then test away...once the power amp section is ok...proceed to fixing ur SMPSU...I think the schematic on Rod's site..at
http://sound.westhost.com/project89.htm
is really good...I haven tried it personally...but I do know a few people here have...so give it a shot...you might want to use parts from ur previous SMPSU...
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Old 28th September 2003, 02:08 PM   #24
MaXiZ is offline MaXiZ  Italy
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Quote:
or izzit on another thread??
http://www.diyaudio.com/forums/showt...581#post242577
Quote:
think the schematic on Rod's site
If you notice the final part is exactly the same.. Except for the sg3525 that my supplier finished... Well he have only one but i burned it so i've to use the sg3524.. not the best choice i know!
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Old 28th September 2003, 02:14 PM   #25
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Hmmm...you got a scope?? Might wanna look at the wave forms at the output of that controller IC...
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Old 28th September 2003, 02:18 PM   #26
MaXiZ is offline MaXiZ  Italy
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I don't own one.. Is so important to have a perfect square wave?
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Old 28th September 2003, 02:28 PM   #27
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I guess so...and the SG3525 can be "purchased" for free...check it out at
http://www.onsemi.com/site/products/...G3525A,00.html
Click on the samples button...fill in the necessary details registeration form etc...you get 20 for free...hehehe...you are probably wondering why I didn't tell you earlier...you do have to wait for the chip to arrive at your doorstep though...
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Old 28th September 2003, 02:37 PM   #28
mcp is offline mcp  United States
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Quote:
Originally posted by MaXiZ
At http://www.ampslab.com/ia502schema.htm is reported to use the 142/147 and u say to don't use them.. why?
Look closely at the output section. Your schematic does not drive power darlingtons.

Quote:
And i saw "input sensitivity 1v".. This mean that if my car stereo give and output of 30mV@360mA i can't hear nothing. Right?
This chip is not meant for cars.
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Old 28th September 2003, 03:13 PM   #29
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Quote:
This chip is not meant for cars.
SO i need a preamp right?
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Old 28th September 2003, 03:26 PM   #30
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it might not be for a car...but it CAN be modded for a car...the input of a volt is pretty normal...
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