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Old 13th February 2011, 03:20 PM   #1351
sendler is offline sendler  United States
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Location: ny
Default Sorry

I tried those. They don't sound quite as good. If you read through my posts in the Sure 2X100 thread you will see all of the coils I tried. It almost looked like Wurth was going to drop the WE-PD line of coils as they were out of stock for quite a while last year. Thankfully most of the big online distibutors have them again.
.
Quote:
Originally Posted by Centvrion View Post
I'm sorry, but I'm interested in output coils too...
I've to place an order to a local e-shop, but it hasn't got the Sendler's WE-PD of that inductance value...it has only WE-HCC series ("High current") there is any difference? Are not even better? They have a max current of 13-15A and a lower series resistance... I've found these: 7443330470 and 7443320470
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Old 13th February 2011, 06:55 PM   #1352
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Thank you sendler, very kind!
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Old 13th February 2011, 09:53 PM   #1353
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Just today finally testing TK2050 v1 & v2 assembled I found that something is not going fine with them (both).

- I hear a big noise (thump ??) when switching-off the amps.
- All channels have background noise, but right tweeter (on v2) is too high
- Tested DC offset and set them near "0"; noise still there.
- v1 remains "on" even if I switch onboard switch off
- I found "78M05 transistors" on both amps (v1 & v2) have middle leg broken (I'll try to post a photo later)

First time I switch them on for testing all seemed to be fine; no switch-on/off thump and not background noise. All connections have been made in order, so I don't see what was wrong!

Any idea of what happened?
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Old 14th February 2011, 09:13 AM   #1354
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Quote:
Originally Posted by GaloDourado View Post
Just today finally testing TK2050 v1 & v2 assembled I found that something is not going fine with them (both).

- I hear a big noise (thump ??) when switching-off the amps.
- All channels have background noise, but right tweeter (on v2) is too high
- Tested DC offset and set them near "0"; noise still there.
- v1 remains "on" even if I switch onboard switch off
- I found "78M05 transistors" on both amps (v1 & v2) have middle leg broken (I'll try to post a photo later)

First time I switch them on for testing all seemed to be fine; no switch-on/off thump and not background noise. All connections have been made in order, so I don't see what was wrong!

Any idea of what happened?
FYI, I'm using 2xMeanwell SMPS 27v 350 (one for each board).

Is it safe to keep amps running this way?

Pics from Tk2050 v2 added (v1 is exactly the same)

Click the image to open in full size.
Click the image to open in full size.

Last edited by GaloDourado; 14th February 2011 at 09:17 AM. Reason: More questions
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Old 14th February 2011, 09:56 AM   #1355
alkasar is offline alkasar  France
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Quote:
Originally Posted by GaloDourado View Post
- I found "78M05 transistors" on both amps (v1 & v2) have middle leg broken (I'll try to post a photo later)
78M05 is the voltage regulator that provides 5V to the chips. Middle leg is GND, same as dissipator. Since dissipator is soldered to the board GND, the middle leg is not necessary. My early T2 board is the same and works perfectly.

I don't know where your issues come from, but it is not from this cut leg.
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Old 14th February 2011, 10:14 AM   #1356
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Quote:
Originally Posted by alkasar View Post
78M05 is the voltage regulator that provides 5V to the chips. Middle leg is GND, same as dissipator. Since dissipator is soldered to the board GND, the middle leg is not necessary. My early T2 board is the same and works perfectly.

I don't know where your issues come from, but it is not from this cut leg.
Tks alkasar.

I know nothing abt electronics. I've related this because it's the only extrange thing I've found in the plate; rest visually seems to be ok.

Maybe someone (hifimediy himself) have any idea where theese ugly things come.

PD. Excuse my bad english... I can not always find the right words to explain myself clearly!
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Old 14th February 2011, 10:34 AM   #1357
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Join Date: Dec 2010
Hello,

Just wanted to know (didn't find it mentioned anywhere) if the T2 100W at 4Ohm amp is stable at 2Ohms..... assuming it is used with a reasonably good PSU like a meanwell 27V SMPS.

It so happens that I might have to connect two 4ohm woofers (8 inch) in parallel.

Thx.
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Old 15th February 2011, 06:21 PM   #1358
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Join Date: Sep 2010
Quote:
Originally Posted by GaloDourado View Post
Just today finally testing TK2050 v1 & v2 assembled I found that something is not going fine with them (both).

- I hear a big noise (thump ??) when switching-off the amps.
- All channels have background noise, but right tweeter (on v2) is too high
- Tested DC offset and set them near "0"; noise still there.
- v1 remains "on" even if I switch onboard switch off
- I found "78M05 transistors" on both amps (v1 & v2) have middle leg broken (I'll try to post a photo later)

First time I switch them on for testing all seemed to be fine; no switch-on/off thump and not background noise. All connections have been made in order, so I don't see what was wrong!

Any idea of what happened?
Anyone can help?
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Old 15th February 2011, 06:58 PM   #1359
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It's quite probable that on/off relays passed to better life! Go to Hifimediy and try to follow the same tip for T1 board. About the transistors...I'm sorry but I don't know!
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Old 16th February 2011, 08:40 AM   #1360
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I've been rechecking all connections and found 1 mistake:

- Ground was inverted in 01 loudspeaker between tweeter and woofer (I mean, line was ok in both drivers, but tweeter ground was to woofer, and woofer ground was to tweeter).

Once wiring was done ok:
1. Background noise disappeared
2. Onboard switch on T1 is now working again
3. Shutdown pop noise is still there

Any advice on point 3?

PD: Loudspeakers are driven active, woofers by T1 and tweeters by T2.
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