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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

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Old 29th September 2019, 04:07 PM   #81
meanie is online now meanie  Singapore
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I am happy using them with the Yarra preamp ps.
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Old 30th September 2019, 11:28 AM   #82
Harry3 is offline Harry3  Australia
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Are you guys using one power supply for both channels?

I prefer a power supply for each channel but the cost is high.
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Old 30th September 2019, 07:45 PM   #83
Project16 is offline Project16  France
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Yes, one UltraBIB in +/- 12v for both channels.
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Old 1st October 2019, 06:11 AM   #84
Harry3 is offline Harry3  Australia
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Default Power Supply

I like the Salas UltraBIB but at US$25.00 for each PCB, I find it expensive.

I'm currently looking at the Texas TPS7A4701/ TPS7A3301 regulator boards sold on AliExpress.

TPS7A4701\TPS7A3301 module ultra low noise linear regulator precision operation amplification fever power supply-in Switch Caps from Home Improvement on Aliexpress.com | Alibaba Group

Has anyone used these with good results? I will precede them with CRC filters.

I'm not sure if all these low noise regulators are that much better than the old LM317/ LM337 regulators when using CRC filters
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Old 1st October 2019, 09:01 AM   #85
AnthonyA is offline AnthonyA
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1963 3015 is great.. It have high transient response.. For me u it a one of my favorites. Great bass dynamics no ringing. And it behaves like a higher voltage swing. Depth width is good. But it have a cleaner sound... Some people might not like. Depending on accompanying equipment. Best of all very cheap to implement.
However for China pcb.. Expect very long break in I think it's the materials they use, it have a very dead sound for quite some time , but i didn't really mind. I do prefer diy pcb when able.
My friend uses lm723 type. Gives a fuller sound.



Also use very good quality resistors.

Didn't work out too good when poor one is used. It's a very transparent sounding amp. So any single poor quality resistor will eventually stick out like a sore thumb. It's low count anyway.
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Old 1st October 2019, 09:06 AM   #86
AnthonyA is offline AnthonyA
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Tps7a4700 is a little more anemic and dry. But should be ok if you can match other parts. Like more takman carbon I guess
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Old 1st October 2019, 09:43 AM   #87
Harry3 is offline Harry3  Australia
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That's good information. Thanks Anthony.

Others who have built different power supplies, please post your impressions.
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Old 1st October 2019, 10:04 AM   #88
Project16 is offline Project16  France
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For those who would be interested, the gerber files of my version are available.
Attached Images
File Type: jpg UltraBIB-PCB.JPG (177.7 KB, 215 views)
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Old 1st October 2019, 11:04 AM   #89
manniraj is online now manniraj  India
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Can you please share me the Gerber files of your version.

Thanks in advance and it does look sleek and perfect for mounting
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Old 2nd October 2019, 10:22 AM   #90
Project16 is offline Project16  France
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HI all.



Here are the .LAY and gerber files for the UltraBIB 1.3.
In the archive there is a REV-1 with some improvements, especially at the level of the capacitors C3 which are too close to the mosfets or then it will be necessary to choose capacitors 105 . The best is to choose the REV-1 version.
The picture shows the initial version that works perfectly.

Attached Images
File Type: jpg SAM_3573.JPG (78.5 KB, 193 views)
Attached Files
File Type: zip UltraBIB - v1.3.zip (161.2 KB, 49 views)
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