Audiosector newb questions.... searched for hours

dennis_6 · 17th November 2009, 06:08 AM

I am seriously considering purchasing a Audio Sector LM4780 kit, however the schematic posted on Peter Daniel's website is a little confusing. It shows bridged and stereo mode as the same circuit. Not really understanding how that can be. I am looking to get a 120 watts per channel using two LM4780 boards. One board bridged for the Left channel, one bridged for the right. They will be driving a pair of Cerwin Vega Ve12F speakers with 8ohm impedances. My preamp has balanced xlr and TRS outputs only.

Does anyone have pictures of completed configurations such as this, to get me on the right path. I have probably spent five hours reading through threads here, before registering to find out how the bridged mode is using a left and right channel input/output. Only the parallel schematic looks close, but that wouldn't give me the 120 watts per channel into 8 ohms that I need.

Any help is greatly appreciated.

peranders · 17th November 2009, 06:59 AM

The pcb can be used bridged mono, or stereo

You can even connect the two channels in parallel.

dennis_6 · 19th November 2009, 02:58 AM

Thanks, I guess I will just buy the pcb and see if I can figure out the bridged wiring. I hope it comes with better schematics than the website.

Peter Daniel · 19th November 2009, 04:16 AM

You can see it better here: AudioSector-chip amp kits, dacs, chassis

dennis_6 · 19th December 2009, 08:14 AM

Think I got the wiring now, the XLR provides the inverted signal and the outputs are tied together. Anyone have a recommendation for the voltage and wattage of the transformer? I am planning on using one rectifier board and one transformer driving both the bridged channels. (both boards in bridged mode)

littlerick · 20th December 2009, 07:44 PM

If you go to the Audiosector part of forum there are lots of links and info. Kit is nice, and Peter Daniels is awesome with his help.

Peter Daniel · 20th December 2009, 07:55 PM

I would go with 400VA unit with voltage ranging approx 2 x 22 V AC.

dennis_6 · 20th December 2009, 10:31 PM

Thank you sirs.

17th November 2009, 06:08 AM	#1
dennis_6 diyAudio Member Join Date: Nov 2009	Audiosector newb questions.... searched for hours I am seriously considering purchasing a Audio Sector LM4780 kit, however the schematic posted on Peter Daniel's website is a little confusing. It shows bridged and stereo mode as the same circuit. Not really understanding how that can be. I am looking to get a 120 watts per channel using two LM4780 boards. One board bridged for the Left channel, one bridged for the right. They will be driving a pair of Cerwin Vega Ve12F speakers with 8ohm impedances. My preamp has balanced xlr and TRS outputs only. Does anyone have pictures of completed configurations such as this, to get me on the right path. I have probably spent five hours reading through threads here, before registering to find out how the bridged mode is using a left and right channel input/output. Only the parallel schematic looks close, but that wouldn't give me the 120 watts per channel into 8 ohms that I need. Any help is greatly appreciated.

17th November 2009, 06:59 AM	#2
peranders Electrons are yellow diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 3	The pcb can be used bridged mono, or stereo You can even connect the two channels in parallel. __________________ /Per-Anders (my first name) or P-A as my friends call me BPA300 Group Buy Round 4, SMD-kit and DRV134 pcb. Not too late to sign up. Sign up HERE

19th November 2009, 04:16 AM	#4
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	You can see it better here: AudioSector-chip amp kits, dacs, chassis __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

20th December 2009, 07:55 PM	#7
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	I would go with 400VA unit with voltage ranging approx 2 x 22 V AC. __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

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19th November 2009, 02:58 AM	#3
dennis_6 diyAudio Member Join Date: Nov 2009	Thanks, I guess I will just buy the pcb and see if I can figure out the bridged wiring. I hope it comes with better schematics than the website.

19th December 2009, 08:14 AM	#5
dennis_6 diyAudio Member Join Date: Nov 2009	Think I got the wiring now, the XLR provides the inverted signal and the outputs are tied together. Anyone have a recommendation for the voltage and wattage of the transformer? I am planning on using one rectifier board and one transformer driving both the bridged channels. (both boards in bridged mode)

20th December 2009, 07:44 PM	#6
littlerick diyAudio Member Join Date: Nov 2009 Location: Lincolnshire UK	If you go to the Audiosector part of forum there are lots of links and info. Kit is nice, and Peter Daniels is awesome with his help.

20th December 2009, 10:31 PM	#8
dennis_6 diyAudio Member Join Date: Nov 2009	Thank you sirs.

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