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Chip Amps Amplifiers based on integrated circuits

BALANCED LINE DRIVER,PCB layout share
BALANCED LINE DRIVER,PCB layout share
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Old 5th September 2008, 08:32 PM   #111
MrMajestic is offline MrMajestic  Sweden
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Im a dummie, I wired the input voltage terminals incorrectly and now I probably have two toasted regulators.
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Old 2nd November 2008, 12:28 AM   #112
gaborbela is offline gaborbela  Canada
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Hello Zang
Do I have to use for the balanced driver a regulated power supply or just any power supply will do the job.
I ask these because the balanced pre driver it uses +/-15V and you regulated power supp voltage min18V .
Do I miss something here?
Or the regulated power supply for the amplifier not for the pre balanced driver .
Please let me know .
Thanks
Greetings
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Old 11th November 2008, 12:51 AM   #113
digi01 is offline digi01  China
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Hi Gabor,
You can use any power supply do the job,+/-18VDC to +/- 30VDC.
The driver board have include a couple of fixed regulator on the +/- rails(LM18L15,LM79L15).

Zang
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Old 11th November 2008, 01:27 AM   #114
gaborbela is offline gaborbela  Canada
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Thanks Zang
Greetings
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Old 7th February 2009, 05:28 PM   #115
juluska is offline juluska  Ukraine
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Default balanced line driver for BPA300

I'm preparing a BPA300 amplifiers ( http://www.shine7.com/audio/bpa300_2.htm) and i need a balanced line driver.
Can i buy a pair of these pcbs for dvr134? How?
What is the proper voltage and VA rating transformer?
And what about the rectifier bridge?
Are not necessary bigger filter capacitors before the regulation?
Thanks
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Old 7th February 2009, 05:43 PM   #116
MrMajestic is offline MrMajestic  Sweden
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Default Re: balanced line driver for BPA300

Quote:
Originally posted by juluska
I'm preparing a BPA300 amplifiers ( http://www.shine7.com/audio/bpa300_2.htm) and i need a balanced line driver.
Can i buy a pair of these pcbs for dvr134? How?
What is the proper voltage and VA rating transformer?
And what about the rectifier bridge?
Are not necessary bigger filter capacitors before the regulation?
Thanks
They are available at www.assemblycraft.com
The need +-18V DC or +-15 if you bypass the onboard regulators.
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Old 13th February 2009, 02:41 AM   #117
samsagaz is offline samsagaz  Argentina
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i cant find the datasheet the purpose of the optional Resistors :S

Can someone please tellme what is the purpose of these?
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Old 13th February 2009, 10:14 AM   #118
CJ900RR is offline CJ900RR  Sweden
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Default Re: balanced line driver for BPA300

Quote:
Originally posted by juluska
I'm preparing a BPA300 amplifiers ( http://www.shine7.com/audio/bpa300_2.htm) and i need a balanced line driver.
Can i buy a pair of these pcbs for dvr134? How?

I know that several people uses this solution whit the DRV134 and similar circuits to bridge their amplifier, but I would not recommend it.

Quote:
DRV134 datasheet
The DRV134 (and DRV135 in SO-8 package) converts single-ended, ground-referenced input to a floating differential output with +6dB gain (G = 2).
The BPA300 (and almost every other LM3xxx-based amplifiers) have a unbalanced, single-ended input. To bridge this amplifiers you need to convert one unbalanced signal to one unbalanced, non-inverted and one unbalanced, inverted signal. The signals need to be unbalanced, referenced to ground, and not a floating differential signal.

The DRV134 is not suitable for the job and there can be issues when using it for that. The job can easily been done with a dual OP-amp and some resistors instead.
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Old 13th February 2009, 11:04 AM   #119
juluska is offline juluska  Ukraine
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I'm a beginner, how can a do this easily. Is there any kit, pcb, schematic?
thanks
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Old 13th February 2009, 11:39 AM   #120
CJ900RR is offline CJ900RR  Sweden
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See this website. Both schematic shown there works like a charm!

http://sound.westhost.com/project14.htm
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