Need input buffer design or ideas for icepower 125asx2 in BTL mode. - Page 2

katarakt · 29th July 2011, 09:06 AM

stokessed, thanks for information.

As StigErik has no problems running these with a miniDSP i think there'll be no problem with this input impedance. I'm going to build 2 (later +2 = total 4) subs controlled with one miniDSP.

stokessd · 29th July 2011, 11:06 PM

If you are building subs, you have no problems with the dropping input impedance at higher frequencies regardless of input circuit

Sheldon

toufu · 30th July 2011, 02:22 AM

Would a b1 buffer suitable here?

Tangman · 10th August 2011, 04:45 PM

Hi Everyone -- long-time lurker and 1st time poster.

I've never built anything before unless it was made of wood, so there's my skill level. This site has always yielded good and/or interesting info which helped guide my hardware purchases, but I've never (yet) dived into an electronics project.

So, I don't know if anyone cares to help me with my ignorance (it's a big job!) but I'm wondering about the DIY possibilities of these 125asx2 modules. After reading the datasheet it seems easy enough to assemble a stereo version, but I'm confused about bridging them. I was under the impression it was a matter of a jumper to switch from SE to BTL, but That's obviously wrong. Is there a nutshell explanation someone can give me of what physically needs to happen to these modules to render them "BTL"? Does it take another version of the board entirely, or an add-on of some sort?

JensRasmussen · 20th August 2011, 07:42 PM

Quote:

Originally Posted by Tangman

Hi Everyone -- long-time lurker and 1st time poster.

I've never built anything before unless it was made of wood, so there's my skill level. This site has always yielded good and/or interesting info which helped guide my hardware purchases, but I've never (yet) dived into an electronics project.

So, I don't know if anyone cares to help me with my ignorance (it's a big job!) but I'm wondering about the DIY possibilities of these 125asx2 modules. After reading the datasheet it seems easy enough to assemble a stereo version, but I'm confused about bridging them. I was under the impression it was a matter of a jumper to switch from SE to BTL, but That's obviously wrong. Is there a nutshell explanation someone can give me of what physically needs to happen to these modules to render them "BTL"? Does it take another version of the board entirely, or an add-on of some sort?

BLT means that the two channels will have to work 180 derees out of phase. To get them to do this, you must build a phase inverter circuit and feed the output from this to one of the inputs. The other input should recieve the original signal directly.

You will only get one BLT channel pr. ASX2 board.

Warm regards
\\\Jens

katarakt · 3rd February 2013, 10:44 PM

I want to start my 125ASX2 project and want them to run in BTL mode. Can someone take a look to my picture i've modified if this wiring from a balanced source is correct? I'm not an expert in this kind of stuff:

JensRasmussen · 5th February 2013, 09:07 AM

Katarakt,

Yes, this should work fine :-)

BTW: I have designed a Phono -> Balanced converter PCB that fits the ASX2 series nicely.....

\\\Jens

katarakt · 5th February 2013, 03:35 PM

Great, thx a lot!

Phono to Balanced converter sounds great, do you have a picture? Is it small?

dannyss21 · 13th February 2013, 11:46 AM

Jens,
I'd also be interested in getting more info on your PCB.

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29th July 2011, 09:06 AM	#11
katarakt diyAudio Member Join Date: Jun 2011	stokessed, thanks for information. As StigErik has no problems running these with a miniDSP i think there'll be no problem with this input impedance. I'm going to build 2 (later +2 = total 4) subs controlled with one miniDSP.

29th July 2011, 11:06 PM	#12
stokessd diyAudio Member Join Date: Nov 2002 Location: Fort Wayne, IN	If you are building subs, you have no problems with the dropping input impedance at higher frequencies regardless of input circuit Sheldon

30th July 2011, 02:22 AM	#13
toufu diyAudio Member Join Date: Jun 2008 Location: San Francisco	Would a b1 buffer suitable here?

10th August 2011, 04:45 PM	#14
Tangman diyAudio Member Join Date: Aug 2011 Location: Maine	Hi Everyone -- long-time lurker and 1st time poster. I've never built anything before unless it was made of wood, so there's my skill level. This site has always yielded good and/or interesting info which helped guide my hardware purchases, but I've never (yet) dived into an electronics project. So, I don't know if anyone cares to help me with my ignorance (it's a big job!) but I'm wondering about the DIY possibilities of these 125asx2 modules. After reading the datasheet it seems easy enough to assemble a stereo version, but I'm confused about bridging them. I was under the impression it was a matter of a jumper to switch from SE to BTL, but That's obviously wrong. Is there a nutshell explanation someone can give me of what physically needs to happen to these modules to render them "BTL"? Does it take another version of the board entirely, or an add-on of some sort?

3rd February 2013, 10:44 PM	#16
katarakt diyAudio Member Join Date: Jun 2011	I want to start my 125ASX2 project and want them to run in BTL mode. Can someone take a look to my picture i've modified if this wiring from a balanced source is correct? I'm not an expert in this kind of stuff:

5th February 2013, 09:07 AM	#17
JensRasmussen diyAudio Member Join Date: Jul 2002 Location: Denmark - Jutland	Katarakt, Yes, this should work fine :-) BTW: I have designed a Phono -> Balanced converter PCB that fits the ASX2 series nicely..... \\\Jens

5th February 2013, 03:35 PM	#18
katarakt diyAudio Member Join Date: Jun 2011	Great, thx a lot! Phono to Balanced converter sounds great, do you have a picture? Is it small?

13th February 2013, 11:46 AM	#19
dannyss21 diyAudio Member Join Date: Nov 2011	Jens, I'd also be interested in getting more info on your PCB.