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Cheers mate, sorry to hear about all that... What you could do is measure some stuff while it is in the box, like output resistances and whether there is some offset voltage when you turn it on...

It is nice to have adjustable high and lowpass, cutting lows will clean up the 'satellite' speakers. The point of the filter I proposed is that it also makes L+R mono signal, but that can off course...

Maybe this is simpler for you:
http://www.ebay.com/itm/Low-Pass-Volume-Controlled-Preamplifier-Board-for-Subwoofer-/110918399787?pt=LH_DefaultDomain_0&hash=item19d340772b

Two cinch in and one...

You need a power supply with it and then it is simple, apply stereo line signal audio and then there is a mono output. I don't have a picture, maybe the seller has it...

This would work:
http://www.ebay.com/itm/NE5532-Low-pass-Filter-Subwoofer-Process-Circuit-Frequency-Volume-For-Amplifer-/280938795796?pt=US_Home_Audio_Amplifiers_Preamps&hash=item416941d314

And...

Did you also use mica or any other form of insulation? The chip MUST NOT make electric contact to the case...

And yes you can measure whether there is a poor contact. Any place where there is poor...

Beep tones come from the modulator, for instance when there is lack of current. In an extreme case it could be due to poor heatsinking. If that is the case it must be too hot to place your finger on...

With input cabling attached and without as well?

Only the Tripath chip would be damaged.

The later rev. has a jumper next to the socketed 74HC chip, this must also be closed. When unsure just look up the TAA4100A datasheet and hardwire the AM...

Next time place a 24V truck interior lighting bulb (soffitten) in series dude!! That's not holy, but will be miuch safer than have unlimited current supply from batteries! They are just about the...

Definitely! These little ones don't like a hard pounding! ;)

And then what drivers will you use? THe SPH-30X is rather perfect for the job as it is so light and rugged and loud, but it is not the...

Cheers, it is sealed. Still features amazing low frequency response. It also performs very well as mini boombox when placed on the floor, the output level it can reach is literally a jaw dropper for...

okiedokie, solved, didn't know I could have 1000 messages!!

Wouldn't pry around in this corpse any further and build the others first. Will be a breeze to repair this one after the smell of success... Trust me, been there....

That's lovely, I want one!

You dont need the leds and the 5V must indeed be connected straight to the sleep pin... iirc you need to connect 5v to two other pins...

I cant see where it went wrong, the soldering doesnt look...

No, if it works the amp kit is fine, all you need is get the same diodes...

That's 60K and 59.9K then.... that's good...

The offset voltage could be due to a tolerance in the output clamping diodes (SMD diodes), but I doubt it will be worth swapping these if you find them...

Ah well, in series is like train carriages are connected and parallel is like a car crossing the track. The filter is simply a common mode inductor that is placed in the positive (and if there is a...

Simple, speake outputs on the amplifier, the large screw terminals, four contacts in a row. Measure the resistance over these with no speakers connected and amplifier off. Usually this measures about...

On an asymmetric power supply amplifier VCC is the supply voltage of the whole amplifier, which indeed is VNN and VPP on a symmetric powered amplifier.

In this case they mean to place an L/C...

No, I mean the resistance over the speaker outputs. Then best set the meter to a range of 50K or 100K....

It is not completely dramatic, but certainly on the edge... It could point to some kind of problem or potential problem. How do your output resistances measure when the amplifier is off and...

You only need to disconnect two of the four wires. If you pull just one plug on a loudspeaker it cuts out right? That's all there is needed...

I used RT424 type relays. These are reliable, compact...

It is sometimes case dependent and it is always more complicated to do it exactly right so that it works in every situation.

Shielding is grounded somewhere. Best is not to ground shielding at...