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Old 29th August 2004, 12:00 AM   #11
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Quote:
Originally posted by Lars Clausen
Hi Ed

I would love to see there the input wires end up, since you have connected both the + and - input to the cable.
I have seen some examples where people have used the - input of the module for GND. That goes wrong!
Oh, I wired all three inputs up because I was originally going to put on a balanced jack, and then into the PC or hifi system. However, first I wanted to try it with something less expensive, so the extra white wire is just snipped short and taped, and an RCA jack was added so that I could connect directly to the source equpment with no other interconnect required.

I wasn't sure if the amp needed the -ve tying to ground or anything clever, but since the "cookboox" doesn't require it I assumed it would be OK to even connect it up, but just leave it floating at the far end of the cable.

In retrospect, whatever was the cause of blowing the module it was extremely fast because I never saw the blue LED light up. I only realised it was even there when I wired up the second module. Does this offer any clues as to what I did wrong..?

Thanks

Ed W
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Old 30th August 2004, 12:33 PM   #12
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With regard to my last questions about heat output, this is the layout I think I might want to use to minimise wire lengths, etc. Any advice on whether this will work well, and most importantly will I be able to dissipate the heat with just that thin bit of aluminium strapped to the bottom of the proposed steel case? (it's only about 1mm thick)

Drilling some holes in the aluminium sheet is presumably a good idea also...

There will of course be 4 amps in the final install, although they aren't all shown here.

Click the image to open in full size.
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Old 31st August 2004, 03:04 AM   #13
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Hi,

Interesting thread. As a newbie to DIY audio, just wondering if any of your amp modules are suitable for use in car audio applications? Presumably they just need the power supply sorted out from 12V to whatever it is they are running at?
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Old 22nd October 2004, 02:59 PM   #14
wytco0 is offline wytco0  United Kingdom
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Default LC Audio Predator Power Supply

ewildgoose or anyone else who has used the LCaudio Predator power supply !

Do you have any instructions for how to connect t up? I have just received the last one they had in stock but it does not have any instructions on what connections go where, I have asked them for a datasheet or instructions but they don't seem to have one.

I was hoping to use the supply with a centre tapped transformer but I don't know how to connect it or if it will work.

The board seems to have almost not indications of what is what on it and I am not even sure where the DC connections are !

Any help gratefully received.

Thanks.
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Old 22nd October 2004, 08:20 PM   #15
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Turn the board over and look at the bottom. You will see 6 small holes (two lots of three). These are positive, ground and negative. There is also a small hole above the negative for the 20v feed.

See here:
http://www.lcaudio.dk/predpsu3.jpg
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Old 22nd October 2004, 09:21 PM   #16
wytco0 is offline wytco0  United Kingdom
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Thanks ewildgoose,
very useful, any idea about the AC side? there are 2 banks of screw connector each with 4 connections but no markings other than one says Trafo 1 and the other trafo 2.

One other point the -ve connection near the middle of the board seems to be under the cap? how did you manage to solder that one?

Did you get any instructions with your board?

Thanks

Tim
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Old 22nd October 2004, 09:31 PM   #17
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See the link I sent...? Try changing the number on the URL and see the other pictures. I think that answers your questions? Also, see the traces on the bottom of the board. Basically you just need to wire up two ac inputs (two of each inputs on each block are shorted to each other)

It's scary when you first look at it, but just turn it over, examine the traces, and use a meter, and it should be pretty obvious after a bit of study.

As for soldering, solder to the underside of the board, then you don't have access problems.

Ed
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Old 22nd October 2004, 09:36 PM   #18
wytco0 is offline wytco0  United Kingdom
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Ed, I did look at the other pics but I want to use a centre tap transformer which is why I was digging a bit more?

Thanks for your help

Tim
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Old 22nd October 2004, 10:46 PM   #19
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No idea what that means, sorry. Why not post a new question instead of using this thread?

There was a proposal to start a new Zappulse builders thread. I think you should start one with this question (name the thread appropriately) and give a little background on your project. We can kickoff from there. Drop Lars a note to say that you have done it, and he should monitor it as well and drop you replies back there

Hope this helps?

Ed
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Old 23rd October 2004, 02:13 PM   #20
subwo1 is offline subwo1  United States
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Default Input Shunts

ewildgoose

If you are using the speaker drive output of your computer, I would like to suggest soldering a 1k resistor across the input connections of your amp modules.
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