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Old 30th July 2007, 04:23 PM   #101
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Hi,
Anyone tried THAT 1646 balanced line driver?

http://www.thatcorp.com/datashts/1600data.pdf

I bought some at eBay for my active crossover. They work very good, IMHO. I did not try the "common mode off-set reduction" tip, yet.

The other chips are difficult to get.

M
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Old 31st July 2007, 09:25 AM   #102
digi01 is offline digi01  China
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I got some information from a german diyer about TAHT1646.I just buy few from ebay too,the chip is a good pin to pin alternative of drv134.but it is a bit costly.

thank you Dave(Dataman19),the input is very useful

to Junior,
the 300ohm resistor on my board was left for circuit debug.you can check drv134 datasheet page 9,10 for the details.
you can leave out it in general purpose.


Zang
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Old 20th July 2008, 11:59 PM   #103
nickytl is offline nickytl  Ireland
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Default would this work

Hi,
A complete beginner here but any advice would be great thanks.
I want to be able to connect a tape deck, cd player and phono preamp to a pair of active speakers. The speakers only have balanced inputs XLR.
For a bit of a project I was thinking I would build a BLD with a source selector switch on the input.
I was wondering though would I be able to get away with using the +12V and -12V on an ATX PC power supply? Ive a box of them here pulled from old PCs. Would I need to add extra regulation and if so does anyone have a link they could send my to.
The other question is would this approach wind up worse in terms of noise than just using an unbalanced passive solution?


Any ideas would be welcome
all the best
N
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Old 21st July 2008, 12:46 PM   #104
Dxvideo is offline Dxvideo  Turkey
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I think PC type SMPS s are too noisy for that operation.
You must build a dedicated linear PSU for this, IMO..
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Ozgur
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Old 29th August 2008, 07:50 PM   #105
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I vuilt two of these boards and when I fire them up I get -15V on the negative pin of the DIP8 socket, but a whopping +30V on the positive pin. Im inputing that voltage so it seems as though my input passes through unregulated. Now this happens on both so what could cause this? A faulty regulator, maybe, but two of them? I used TO92 style regulators with heatsinks mounted on them.
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Old 1st September 2008, 11:37 PM   #106
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Ok, so I tried running the board from an 18V supply, but the + side is still not regulating. Im not sure what is happening here. Any ideas would be welcome.
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Old 2nd September 2008, 08:26 AM   #107
digi01 is offline digi01  China
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turn the positive regulator 180 degree.there are pins different of TO220 and TO92.
the attached is a pins direction.


H.B.
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File Type: gif regulated_pins.gif (11.6 KB, 1141 views)
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Old 2nd September 2008, 10:04 AM   #108
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Quote:
Originally posted by digi01
turn the positive regulator 180 degree.there are pins different of TO220 and TO92.
the attached is a pins direction.


H.B.

Thanks, but Im running with the L78L15 and it have the reverse pinout from the LM78LXX TO92 regulator and the same as the To220 regulator. At least according to the datasheet. This was the first thing I checked, but I didnt switch it around since the datasheet indicated the correct pin layout.
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Old 2nd September 2008, 10:56 AM   #109
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I desoldered that sucker, not an easy feat, and sure enough you were right. It works now, so I guess the datasheet from my supplier is wrong or I didnt get the correct regulator. Thanks for your help.
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Old 5th September 2008, 07:51 PM   #110
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Got both boards to work now, but the volume is much lower in one of them. Any ideas as to why that could be?
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