Car AMP7, AMP15 and Truepath

[V-bro]

Hi,

I have connected up a circuit that creates 2x40Vdc, 1x10Vdc and 1x5Vdc out of 10-15Vdc.

AND IT WORKS!

And it can deliver a LOT of current...

Have been bench testing it on AMP7 at full power and there's fine audio and stable rail voltage...

Got this chunk of PCB and a core for the toroidal transformer from a friend. Put all the other parts together myself...

It uses a 3525 switcher at 45Khz...

Now it's just a matter of boxing it up and I've got a BRUTAL car amplifier![}]













------X-max. can be several meters on any driver, too bad it can be done only once...------

[mikechw]

wow... how much current does it draw from a car battery ??

Does anyone know how much current can a normal car battery handle ?

[Scratchy]

V-bro, you make me sick..... []

***It's so easy, everyone should be doing it***

[V-bro]

It's sick indeed isn't it?!

It draws 1A on average, 250mA at idle and i can see peaks of 3,5A but the meters in my lab supply are rather slow...

quote:Originally posted by mikechw

wow... how much current does it draw from a car battery ??

Does anyone know how much current can a normal car battery handle ?

A car battery delivers several hundreds of amperes on starting up your car...

------X-max. can be several meters on any driver, too bad it can be done only once...------

[krilli]

Nice,
what kind of case did you have in mind?

[V-bro]

I may hook up a Truepath after all. Just because it has a blue PCB just like the converter

And it's more compact....

------X-max. can be several meters on any driver, too bad it can be done only once...------

[karsk]

Such a power supply should Jan have as an kit option, it`s not many places that sells smps kits for cars.. i only know about coldamps version, but that is pricy! But maybe it`s hard to get working for the hobbyist??

[col_s]

maybe not hard to get working, but possibly very dangerous!

here's a design that uses the same chip as v-bro's board above:

http://sound.westhost.com/project89.htm

[V-bro]

Indeed such a kit would be nice and not half as dangerous as a mains SMPS, but the transformer is a hard to source part. The UC3525 can be adjusted in frequency and the transformer needs to suit the frequency or vice versa. It's not rocket science to wind your own on a toroidal core just like this one, but it's not rocket science to build a working AMP6 either and still a few people manage to mess it up...

quote:Originally posted by krilli

Nice,
what kind of case did you have in mind?

A die cast box like I always (almost always) use...

I hooked up a Truepath, the AMP7 didn't fit in the designated box and the blue PCB's just look cool together. (not that anyone cares because the box is gonna be closed anyway...)

Not completely finished yet, but working VERY well. Here it is:




















------X-max. can be several meters on any driver, too bad it can be done only once...------

[djQUAN]

dang. the converter looked like it was made for the case! still thinking of how I'm gonna proceed with mine. I recently got a bandsaw so cutting heatsinks and aluminum railing for cases should be easier.