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Old 24th September 2009, 07:10 PM   #521
ElFishi is offline ElFishi  Europe
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Quote:
Originally Posted by SimonKit View Post
A question: do I need something additional when using Mean Well SP-200-24. E.g. to protect the amp while starting up for the inrush current. I never used SMPS for an amplifier.
Depends on the size of the tank caps you use. Too much capacitance and the SMPS will trip when switched on. With post #513 I posted a simple soft start that uses the tank caps as "C" in an RC-circuit to slowly fill the caps. You can ignore the rhs of the schematic.
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Old 25th September 2009, 05:29 AM   #522
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Quote:
Originally Posted by ElFishi View Post
Depends on the size of the tank caps you use. Too much capacitance and the SMPS will trip when switched on. With post #513 I posted a simple soft start that uses the tank caps as "C" in an RC-circuit to slowly fill the caps. You can ignore the rhs of the schematic.
OK thanks!
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Old 25th September 2009, 08:38 AM   #523
Nisbeth is offline Nisbeth  Denmark
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Has anybody experiemented with a fully passive soft-start circuit? I am thinking it must be possible to make a passive circuit that mutes the amp at turn-on and then slowly demutes it. I would really like to get rid of the ugly turn-on thump I have, but making an active solution with relays seems overkill to me. Any ideas/experience out there?

/U.
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Old 25th September 2009, 10:58 AM   #524
dr_vega is offline dr_vega  United States
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Quote:
Originally Posted by Nisbeth View Post
Has anybody experiemented with a fully passive soft-start circuit? I am thinking it must be possible to make a passive circuit that mutes the amp at turn-on and then slowly demutes it. I would really like to get rid of the ugly turn-on thump I have, but making an active solution with relays seems overkill to me. Any ideas/experience out there?

/U.
Simplest is probably a three position switch: Off; soft start; full power.

To turn it on, switch to soft start, wait 5 seconds, switch it to full power.

-dr_vega
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Old 25th September 2009, 11:28 AM   #525
sendler is offline sendler  United States
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Default TP2050 pin 24?

Quote:
Originally Posted by ElFishi View Post
So I completed the list of mods and things around the board I did. Maybe you find that interesting.

- re-wired pins 24 on both TP2050s to 21,22 (Vdd) instead of gnd
.
What does this change?
__________________
Scott
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Old 25th September 2009, 12:26 PM   #526
ElFishi is offline ElFishi  Europe
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Quote:
Originally Posted by sendler View Post
.
What does this change?
Nuttin.
I did it b/c the TK2050 datasheet says
Quote:
For parallel mode operation, the TK2050 can be configured as a single full bridge with double current capability by connecting the CONFIG pin to the Vdd pin of the TP2050.
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Old 25th September 2009, 12:35 PM   #527
Nisbeth is offline Nisbeth  Denmark
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Quote:
Originally Posted by dr_vega View Post
Simplest is probably a three position switch: Off; soft start; full power.

To turn it on, switch to soft start, wait 5 seconds, switch it to full power.

-dr_vega
Maybe I am being dense, but how would you enable the soft start mode?

/U.
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Old 25th September 2009, 01:00 PM   #528
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Originally Posted by Nisbeth View Post
Has anybody experiemented with a fully passive soft-start circuit?
Could a thermistor work for this purpose ?
http://bit.ly/4BuHe
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Old 25th September 2009, 01:30 PM   #529
Nisbeth is offline Nisbeth  Denmark
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Probably not. I was thinking more along the lines of a simple RC-based circuit to mute the amp when power is applied and then slowly unmute as the cap is charged, but I am not really sure how to make it work.

/U.
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Old 25th September 2009, 03:30 PM   #530
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I got my board a few weeks back & have been using a 12v 2A SMPS brick from an external hard disk, but just this morning the UPS man came with the linear power supply I grabbed off eBay for 13 delivered.

It's a Power-One CP162-A, rated to push 24v @ 5A. Manual says you can adjust the output up to 29v @ 3A. It's a bit bigger than I was expecting...

Click the image to open in full size.

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Haven't tested it yet as I'm not sure which output terminals I should use? It didn't come with a schematic & all I can find online is the data sheet for the range, which just tells you the ratings of each model. Anybody help me out? The output terminals are pictured beneath.

Click the image to open in full size.

I'm guessing I use "+24V OUT" to connect to the amp's "VCC" & "24V RTN" to the amp's "GND"? But I'm not sure why some of the terminals are bridged, which is worrying me - I don't want to risk a 13000uF cap exploding & taking my head off!
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