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Old 19th May 2010, 01:18 PM   #121
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Default Update on the boards

Hi everyone, an update on the boards:

Jean-Paul, who was one of the lucky two that got one of the first boards I sent out some weeks ago, pointed out to me yesterday that one resistor gets quite warm, and its a bit close to some 100uf caps. We discoverd that this is because the board is using 12V relays, and this resistor is dropping the voltage so it is acceptable for the 12V relays. Jean-Paul proposed that it would be better to use 24V relays which would need a smaller voltage drop by this resistor, hence less heat. I discussed this with hifimediy, and he pointed out that the 24V relays would give a smaller input voltage range. But anyway we decided to go for 24V relays. He had already some boards finished, but said it would only be 2-3 days delays if changing to the 24V relays, so I thought most people would think it is worth waiting another 3 days to get a less hot resistor.

The new input voltage range will be in the range of 24-33VDC, have to confirm this with hifimediy when he knows the exact specs for the 24V relays.

If you want or need to use higher or lower voltages you can simple change this one resistor (R36) to another value. I can supply more information on this when its confirmed.

So, this means i will have the first boards in about 3 days. Sorry for the extra delay, but as it was only 3 days in question, and as the result might be better, I thought everyone would be happy to wait.
Thanks to jean-paul for pointing this out.

Regards,

Steinar
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Old 19th May 2010, 02:34 PM   #122
teamacc is offline teamacc  Netherlands
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Why not put 2 12v relays in series? That way you will have less voltage to drop, but the same amperage.
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Old 19th May 2010, 03:56 PM   #123
zdr is offline zdr  Belgium
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Anyone knows anything about this baby:

eBay.be: 2*100w 4? TK2050 Class-D Audio Amplifier Board-improved (objet 380233022408 Fin: 19-mai-10 20:23:28 CEST)

Last edited by zdr; 19th May 2010 at 04:12 PM.
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Old 19th May 2010, 04:19 PM   #124
sendler is offline sendler  United States
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Default Kidding?

You are kidding right?
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Sure Electronics New Tripath Board tc2000+tp2050
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Old 19th May 2010, 05:44 PM   #125
zdr is offline zdr  Belgium
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Nope, I just dropped by, I usually hang around analogue forums
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Old 19th May 2010, 05:58 PM   #126
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Quote:
Originally Posted by teamacc View Post
Why not put 2 12v relays in series? That way you will have less voltage to drop, but the same amperage.
Hifimediy mentioned that solution first.
Would it be as stable as having 24V relays in parallel?
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Old 19th May 2010, 06:58 PM   #127
teamacc is offline teamacc  Netherlands
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It might actually be more stable, as the 12v relays might even switch at 8v, meaning 16v is enough.
It requires just as much current through the resistor as a single 12v relay, but the required voltage drop is less than half, thus less heat.
It might even save you a diode, as they both can be on the same diode
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Old 20th May 2010, 07:52 PM   #128
von Ah is offline von Ah  United States
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Default HP smps +32V

Based on the anecdotes of the big sure tk2050 thread, I've found an inexpensive HP SMPS to power this board. Is this thing feasible?
Do I need + and - 32V, or is +32V enough?
Forgive my noobish question.
I am excited to play with this board.
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File Type: jpg HPSMPS1.jpg (181.3 KB, 856 views)
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Old 20th May 2010, 08:11 PM   #129
teamacc is offline teamacc  Netherlands
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Just + will do, no need for negative voltage

The psu looks a little undersized, you might wanna upgrade to more amperes, but some beefy buffer caps might do the job just as well.
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Old 20th May 2010, 08:14 PM   #130
sled108 is offline sled108  United States
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I use this one... It works great and I got it for $12...Good Luck..
HP A/C POWER ADAPTER D135 D145 7110 7130 C7296-60024 - eBay (item 330351604514 end time Jun-07-10 11:55:58 PDT)
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