Sure Electronics New Tripath Board tc2000+tp2050

[dr_vega]

Originally Posted by ElFishi

What thickness is the wire on Arjen's cores and what size are the toroids?

I'll check the wire and toroid size when I get home this afternoon.

-dr_vega

[dr_vega]

Originally Posted by Nisbeth

Been listening a little more to my amp (pics posted a few pages back).I like what I hear, but I can't say I like the, rather bad, turn-on thump I get in my speakers. Is there any way to cure this?

/U.

You can add a timing circuit to either mute the amps or activate relays to disconnect the speakers during turn-on. You should be able to find circuit diagrams pretty easily on the web.

Or you can add a soft-start bypass to the turn-on switch. That's easier and is better for your caps and amps. Again, circuit diagrams are available around the web.

-dr_vega

[ElFishi]

Originally Posted by dr_vega

Arjen's toroids are wound single-layer. The core is red which may make it look like there is another layer, but there isn't. It's a tight fit and I had to work the coils tightly together to get 330 degree coverage. They come pretty well filling up the whole 360 degrees.

-dr_vega

Thanks for the swift response. May I come back though?
Looking at the picture Arjen posted on ebay

I can see that there are windings that pass through the hole and have close contact with the toroid. And there are windings that pass the inside of the core on top of other windings and do not make contact with the inside of the core. This I would call second layer. The question on the knitting pattern is now, do first and second layer alternate while going around the toroid or is there a first layer wound around 360 degrees of the core and then another layer added going around the core a second time.

Even though I am not sure I fully understood you answer, the fact that you are able to free up 30 degree of coverage would mean that first and second layer alternate.
Do your cores resemble the picture at ebay? I have a hard time to believe that with this wire gauge you could press the windings together such that 30 degrees are left open.

Cheers

[nrg2009]

Gents,

I fixed my ground issue, and how SWEET it is. Very, very nice, works great. I ordered my 2nd board. You're all invited for a beer and a listening session.

[dr_vega]

Originally Posted by ElFishi

Do your cores resemble the picture at ebay? I have a hard time to believe that with this wire gauge you could press the windings together such that 30 degrees are left open.

Cheers

My cores are the same as the picture. The last couple of windings are loose and and cross over each other. After I had dressed the windings there were no more crossovers, it is entirely single-layer. I was only able to get a minimun of clear space on the inside of the toroid, almost none. The 30 degrees is on the outside of the toroid. So I guess I don't really have a gap in the windings at all.

-dr_vega

[cheric]

Audio1st,
I received the Meanwell 24V / 6A PS today. When I connected it to the TK2050 board by itself, everything was working fine at the set voltage. But when I added the 2-6800uf power caps to the screw-in terms, the voltage dropped to about 6 volts. Any way to fix this?
Thanks in advance.
/j

[ElFishi]

Nisbeth and Cheric,

both of your issues can be solved with a soft start circuit that slowly fills your caps before the amp comes on.
The SMPS sees a short circuit when a large current flows to fill the caps and goes down in safe mode delivering only ~5V.
Attached you find a sketch of my poor man's version of a soft start circuit.
I use it with the exact Mean Well SMPS and the sure board and it works.
I have roughly 20mF near the amp.

[cheric]

ElFishi,
My biggest problem is with the power caps. Every time I added a power cap, I would loose a channel (CH1). Only with the MW 24v/6a that the voltage would drop, the other three different power supplies stayed stable, just no channel one.

[ElFishi]

I can explain the drop in the voltage of the Mean Well SMPS when it sees to much capacitance across its output. The same happens with mine. That's why I added the relay.
I cannot explain you losing a channel with the caps. I am at a loss what your problem is there.

[audio1st]

I agree with ElFishi, my power supply didn't like the extra capacitors so I simply only added an extra 3,300uF. I also have no idea why you lose one channel?