Arjen Helder's 2050 boards

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#121
whaleman said:
...
If you use 2 bridges, then do not connect the bridge grounds together, keep them both totally separate, and hopefully you have 2 sets of secondaries on your transformer, or 2 transformers to feed each bridge individually...
Click to expand...

Yes this makes sense !
You have definitely solved my headache !
Thank you ! 🙂

That was what I was supposing but I had only seen schematics for solid state amps with positive and negative voltage.

I will try with two C-L-C filters, and probably some decoupling caps.

Simulations in PSUD2 give quite good results in noise filter, and ripple current attenuation.

So, this is the schematic I will built.
Hope this will help some other beginners like me.
filter CLC.jpg
 
#122
daminos said:
Yes this makes sense !
You have definitely solved my headache !
Thank you ! 🙂

That was what I was supposing but I had only seen schematics for solid state amps with positive and negative voltage.

I will try with two C-L-C filters, and probably some decoupling caps.

Simulations in PSUD2 give quite good results in noise filter, and ripple current attenuation.

So, this is the schematic I will built.
Hope this will help some other beginners like me.
View attachment 203780
Click to expand...

That is a nice schematic, now those two capacitors are 22 uF or 22,000 uF? If 22 uF, then you are not providing additional power reserve than to what is on board already--which may be enough. But I like to have reserve power just for peace of mid that loud transients will be well supplied. Just a thought--not expert advise or anything like that.
 
#125
whaleman! im confused,ive been looking for the ideal power supply for these two mono blocks for a while now. ive always wanted a toroidal supply (i dont know why) but according to arjen the boards draw 5A each ??? what toroid did you use with both secondary's capable of this kind of current ?? do you have a link to what you purchased ??
as i want to get cracking in my next build and i dont want to use a smps if i can avoid it 😱)
 
#126
onis_uk said:
according to arjen the boards draw 5A each ??? what toroid did you use with both secondary's capable of this kind of current ?? do you have a link to what you purchased ??
Click to expand...

With this you get 2 x 18v / 8.3A each
Talema TRT300218 :: Talema Transformers :: Transformers :: Passive Components :: Electronic Parts :: Banzai Music

.. or 2 x 18v / 4.44 A each with this:
Talema TRT225218 :: Talema Transformers :: Transformers :: Passive Components :: Electronic Parts :: Banzai Music
 
#132
onis_uk said:
whaleman! im confused,ive been looking for the ideal power supply for these two mono blocks for a while now. ive always wanted a toroidal supply (i dont know why) but according to arjen the boards draw 5A each ??? what toroid did you use with both secondary's capable of this kind of current ?? do you have a link to what you purchased ??
as i want to get cracking in my next build and i dont want to use a smps if i can avoid it 😱)
Click to expand...

Sorry to take so long to reply, the email notifications on this thread have not been working. I used this toroidal with two 18 V secondaries at 6.94 Amps each. Your problem is finding one at 230V and not the 120 rated here. Avel Y236651 250VA 18V+18V Toroidal Transformer | Parts-Express.com

A 25V rated secondary is too high for the Helder monoblock. Mine ended up yielding over 37 DC volts (due to the 1.41 X factor for converting AC to DC).
 
#134
ArjenShenzhen said:
Nicely Done Whaleman! looks supurb!

for a comparison between the two TK2050's, the sound on the new version is slightly better due to a beefier layout of the tracks, 3mm on both sides on 2 ounce copper thickness, more true holes, and the use of 5X 6uF 50V ceramic caps on the power line just on the other side of the IC to provide the fast fuel for the IC, ive noticed this pushes the performance further, also allowing for less distortion.

in total the total resistance and inductance on the board has been reduced by around 200%, to just a few mOhms in total, i think its the best the TK2050 can do at the moment, and i will also experiment later with some other end stage IC's for some more power.

Greetings and to all you guys, Merry Christmas!
Click to expand...

Arjen, any updates? Itching for the next amp 😀 Pictures please...
 
#138
Grounding

Confused about grounding the modules...

On the Arjen modules...
the RCA input Signal reference,
the Power input reference,
and the 4 screws for mounting the board in the chassis
... are all grounded together on the board.

So, I assume that it is a star ground on board.

Two things :
1 - As the 4 screws lead to safety ground on the chassis, it would maybe better to setup the board with nylon screws, and wire the board to safety ground in a single point of contact ?

2 - With metal screw, the 2 boards will be grounded together by the chassis safety ground. Is it the good setup ?
 
#139
daminos said:
Confused about grounding the modules...

On the Arjen modules...
the RCA input Signal reference,
the Power input reference,
and the 4 screws for mounting the board in the chassis
... are all grounded together on the board.

So, I assume that it is a star ground on board.

Two things :
1 - As the 4 screws lead to safety ground on the chassis, it would maybe better to setup the board with nylon screws, and wire the board to safety ground in a single point of contact ?

2 - With metal screw, the 2 boards will be grounded together by the chassis safety ground. Is it the good setup ?
Click to expand...

I get good results by not grounding anything in the traditional chassis ground way. The speaker grounds can not be shared for one. I would try to isolate the chassis from everything else, especially if you use metal screws to hold the boards down.

Been looking for those nylon screws everywhere, the mounts are even harder to find.
 
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