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Old 7th May 2014, 01:22 PM   #1
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Default XY board bridging for guitar amp

Hi everyone, I'm back on this interesting forum because I've just bought a pair of XY poweamp boards.

here's the board: http://www.ebay.it/itm/390327322345?...84.m1497.l2648

Concerning the components I've found a lot of information in internet and on this forum too.

I would like to ask if would be possible to bridge XY boards...

I'm looking to build a mono guitar amplifier for 8 ohm cabinet, is it possible with those boards?

I would like to get an output power between 70w and 100w, and I was thinking that bringing the boards might help me...

thank you in advance... and sorry for my "dirty" english" ;-)

Last edited by ciscothehellspawn; 7th May 2014 at 01:30 PM.
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Old 7th May 2014, 03:15 PM   #2
AndrewT is online now AndrewT  Scotland
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70W to 100W into 8ohms after bridging is equivalent to 35W to 50W into 4ohms for each of the two halves.
This is certainly a doable target.

I suggest you start with building an unbalanced to balanced line level stage.
This will allow a long cable from your playing location to wherever your amplifiers are.

The outputs of the balanced stage is exactly what the two amplifier halves need to give the balanced output (bridged, but better)
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Old 9th May 2014, 09:04 AM   #3
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Thank you for your reply! I understood your reasoning, but I'm not so expert on this subject! Did you mean to do something like this "crappy" design I've made?

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Old 9th May 2014, 09:41 AM   #4
AndrewT is online now AndrewT  Scotland
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The output side looks like a parallel set up.

The input side is not balanced.
It looks like an attenuator for an unbalanced connection.
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Old 9th May 2014, 10:56 AM   #5
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can u tell me how to balance the input?
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Old 14th May 2014, 02:50 PM   #6
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find drv134pa then positiv output to amp board 1 input ,negative output to amp board 2 input,amp 1 output to plus speaker terminal , amp 2 output to minus speaker terminal (not gnd!) that should do it
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Old 14th May 2014, 05:32 PM   #7
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thank you so much... I'm so newbie, and I dint'n know about the drv134pa!

I've just started to read the datasheet, and I'll post a schematic soon.

I've read about the IC power supply range: between +-4,5 and +-18. I was thinking to use a 300VA tranformer for the boards, to get about +-35v DC. Do you think I need to build another power supply for the driver?
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Old 14th May 2014, 05:48 PM   #8
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find regulator lm7805 if my memory serves me well its fixed 15v positive and his complement pair for -15v that should be it
http://www.fairchildsemi.com/ds/LM/LM7805.pdf
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Old 14th May 2014, 10:24 PM   #9
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The DRV134 mates with the OPA134; however, unless your power amplifier can mimic the OPA134, at least so far as input section, then, there are much better options if you avoid the DRV134, which is not really made for use as a power amp bridge adapter. Basically, use the DRV134 if convenience is the main concern, but avoid it if you want music instead.


Here's a bit from Rod Elliot: Bridging Adapter For Power Amps

And attached is even more variety of purpose made bridge adapters, all of which may outperform the DRV134 on practical audio quality but not convenience.
Attached Images
File Type: gif JRC Phase Splitter.gif (5.0 KB, 26 views)
File Type: gif OP275 Phase Splitter.gif (2.7 KB, 26 views)
File Type: jpg APEX Bridge.jpg (108.1 KB, 26 views)
File Type: jpg Fet Phase Inverter - Ken Peter.jpg (192.5 KB, 26 views)
File Type: jpg T-Network-Bridged.jpg (29.2 KB, 14 views)
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Old 14th May 2014, 10:32 PM   #10
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Quote:
Originally Posted by ciscothehellspawn View Post
Thank you for your reply! I understood your reasoning, but I'm not so expert on this subject! Did you mean to do something like this "crappy" design I've made? IMG_0231.JPG
Actually, here is the crappy/easy way to bridge amplifiers: Simplest Ever Bridging Adapter for Amplifiers <--link
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