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An easy one to start

http://www.quarter-wave.com/Project05/Project05.html

Yes, measuring bridged amps is a bit tricky.

However with ARTA you can make many other things, even measure the inductance of coils. At the moment I'm more interested to loudspeakers in room...

Here is the measurement box. With this you can use Arta software

http://www.fesb.hr/~mateljan/arta/support.htm

and a sound card to take a whole bunch of measurements: Thiele Small parameters...

Isn't the schematic in the download section?

I suppose you are using a +/-26VDC PS, in that case -16V is VN10. Faulty diodes, caps, traces in the output stage?

-19V looks like the VN10 voltage (I don't remember the pin number) that is 10V more positive than VNN (-30V in your amp). Maybe a short in the output stage components?

Really nice [8D][8D] this is a reference compact amp.

Interesting the 1K2 resistors, maybe these are necessary for every SMPS. How are connected?

Really nice [8D][8D] this is a reference compact amp.

Interesting the 1K2 resistors, maybe these are necessary for every SMPS. How are connected?

Usually it is 3%. Tell us the how much it is so we can do another payment.

Usually it is 3%. Tell us the how much it is so we can do another payment.

Can you share your (tested) solution?

For who want to try a simple and cheap solution there is the Velleman K4700 board. It delays output speaker relays on startup and disconnects them on power off. Besides it has another interesting...

Nobody tried DS1802, just Jan, but he was not satisfied as the chip integration needed more research, probably those resistors. My hint is to study the reference design for DS1802 and try with a...

Hi Tim,

I'm in for 16 pieces. So now the GB is for 88 :D

UK: Plim (10)
UK: Rephlex (10)
NL: V-bro (20)
NL: Knorfski (10)
FI: Tuo (10)
BE: Abelma (12)

I don't know so much about SMPS, but I read many times that big caps are dangerous for the SMPS and for themselves. :(

Congratulations [8D]

Waiting for final amp pictures in the gallery.....

I don't think it is a good idea an SMPS with AMP15. The amp has 2 big bulk caps that will not like the high switching frequency of the SMPS: charge and discharge many thousands times each second.
...

Until you have 1.1V on R42 the chip is still alive. It is a reference voltage produced internally. So the problem is elsewhere: what about to post a bigger and clearer picture of your board?

It looks strange you have 4 left caps... The ones you mounted looks right.

A quick summary:

- you have 5V on J10 and what on C63 and C60?
- the amp unmutes: the led goes off and you get 0mV...

In the kit there are only 2 ceramic caps with short legs: these are the two rated 100V.

Well, something is cured :) don't discourage.

Looking at the bottom of your board... did you mount the two small 100V caps in the pads with white circles? I can't see them. The caps must be...

You have no jumpers on J8! Please solder the jumpers on pins 2-3 and 4-5.

Yes, of course, some signal must reach input resistors :)

I checked now my old board: positive (there is a + on the pcb) of C36 is connected to R51 and C35 to R32. The two jumpers are between 2-3...

I built a couple of AMP5 years ago. I remember there were a couple of jumpers to solder to bypass the volume control chip, that is missing. Check if there is continuity from each input to input...