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Old 25th July 2007, 01:56 PM   #1811
axc97c is offline axc97c  United Kingdom
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Default Query about grounding LM4780 kit

Hi all,

Ive recently built peters LM4780 kit, and have found the results fantastic!

Everything working great and now considering more tweak.

I am unsure what to do grounding wise when i move to a aluminium chassis (next week, wood at moment).

I have the speaker grounds going to the OG points on the pcb, and my input grounds going to the SG points on the pcb. At the moment (i know i shouldnt do this) the ground off the mains socket is not connected to anything.

In the aluminium case, i am planning to ground this to the case, but i am not sure where to take the ground from on the LM4780 pcb or the power supply pcb.

Im using one power supply pcb and one lm4780 board in stereo.

Thanks

Adam
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Old 25th July 2007, 02:15 PM   #1812
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Here are some useful links concerning my projects, including preferred ground arrangement for GC amps:

Battery charger for DAC:

http://www.diyaudio.com/forums/showt...967#post803967

DAC polarity fix:

http://www.diyaudio.com/forums/showt...138#post764138

GC ground arrangement:

http://www.diyaudio.com/forums/showt...773#post787773

buffer info:

http://www.diyaudio.com/forums/showt...978#post805978

300pf cap:

LM3886 very prone to mains noise

Wiring CT transformer:

http://www.diyaudio.com/forums/showt...382#post548382

Wiring LM3875 kit:

http://www.diyaudio.com/forums/showt...20#post1108820

Modyfying dual bridges into single bridges:

http://www.diyaudio.com/forums/showt...83#post1196283

Integrated Amp chassis:

Chassis for a group order of non-inverted GC kit?

Oscillator in USB DAC:

http://www.diyaudio.com/forums/showt...13#post1212713

Phono stage:

http://www.diyaudio.com/forums/showt...20#post1123520


GC upgrades:

http://www.diyaudio.com/forums/showt...32#post1231532

NOS DAC:

http://www.diyaudio.com/forums/showt...36#post1170936

USB DAC:

http://www.diyaudio.com/forums/showt...46#post1195246
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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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Old 26th July 2007, 06:50 PM   #1813
axc97c is offline axc97c  United Kingdom
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Thanks for the info,

I believe ive got things correct now.

Above post is a great source of info, thanks

Adam
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Old 26th July 2007, 10:27 PM   #1814
Pocoyo is offline Pocoyo  Indonesia
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Default CD Pro2 LF

I read from the daisy laser website that they have a new type
of CD Pro2 LF, a lot improvment from the next generation CD
Pro2 M

They guarantee all system like play skip forward and reverse
can do the job best

They told us to wait until the product receive, maybe take
a month

So peter as a great designer ( You are one from the three
of my favourite ) would you like to build another DAC,
use Excellent board, best component (maybe opa 627bp,
BGN, low jitter cristal, best resistor, etc) and the board can
be place it in CD casing or separate

This is MARKETING COMMUNICATION says
Not just product but the customer needed

Oh yes I buy ML38 and i spend near us$1000 to do your mods
+ resistor change in Vishay dale s102 for the polystyrene
Is that right styroflex from Siemens is the best better than lcr?

Just wait for your succes Peter
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Old 30th July 2007, 06:00 PM   #1815
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Default HiFi News UK Magazine - PD Preamp & Amps Review

There is a very nice Review of Peter PRE-T1 passive preamp and AMP-2
chipamp monoblock amplifier in this month HiFi News - July 2007, UK Magazine, see page 44. Great pictures too. Good work Peter.

SB
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Old 4th August 2007, 04:45 AM   #1816
BNK is offline BNK  United States
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Do you sell chassis (+connectors) only or chassis+transformer (+connectors)?
I have an old BrianGT 3875 kit that I never used because of missing the above.
I have no problem assembling/soldering so I don't need it assembled.
Thanks.
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Old 5th August 2007, 09:57 AM   #1817
wlowes is offline wlowes  Canada
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Thumbs up Another Peter Daniel amp springs to life

Peter,
I am pleased to report that another of your kits has sprung to life and you have another very happy customer.
I really took my time to build your kit, as I wanted to get it right the first time out of the gate, as I am new to the DIY hobby.
I have to report that I am very happy with the results. After reading all the threads and looking at many pictures of the many creative designs I finally committed to a build. I attach pictures of my work in progress. I wanted to have a solid chassis design. I used solid copper blocks for heat sinks and encased the chip amps in aluminum sheet metal. I kept the layout simple to really reduce signal length.
I put the rectifier just on the other side of the heat sink so the path for power would be short, but fully shielded. I sprang for a Plitron transformer with 24v 300va spec, and I am most pleased with the choice. When I turned it on I wondered if it was working, as there was NO sound from the speakers. Until I hit play on the CD and great sound started. It took 2 - 3 hours of burn in before the sound started to open up, and after 100 hrs it still keeps getting better.
In the pictures the attenuator is a temporary shunt with cheap metal film resistors to verify that it would work well with a passive attenuator with 8k impedence. My next step is to build a Lightspeed attenuator based on Silonex optocouplers. I plan to put the couplers very close to the board, as I understand that the attenuator is part of the feedback loop and it just seems right.
Ultimately I will build a Peter Daniel NOS USB DAC and hard wire it to the amp with short signal paths. The whole thins will go into an old case from an integrated amp.
I plan to use solid gold signal wires 3x30 gauge on the + and 24 on the neg in accordance with very interesting posts on audiogon. In the mean time my source is a 20-year-old sony cdp and it sounds unbelievable to my ears.
Speakers are also recycled 20-year-old Boston acoustics that I refoamed and rewired. It was amazing to me what a difference wire can make. I am using all CAT5 Teflon in the speakers and cables and its pretty good. Ultimate plan is for silver on the speakers and gold on the interconnects.
One innovation I am proud of is the use of a CAT5 connector in place of RCA plugs. I did a lot of reading and came to the conclusion that RCAs are just too massive. Some of the expensive and exotic connectors available commercially are merely very low mass in the out of date form factor. The CAT5 connector deals with megahertz data paths and should handle the delicate audio signal. To me it was a great step forward and only $5. I use pins 1 & 6 for left and right positive and 3 & 8 for ground.
I'll post a couple more pics and follow up once its all in a case.

Peter, you are a star. It was a pleasure to meet you in person when I picked up the kit. I look forward to seeing you again when I take the next step with the DAC.
Pic is here: Click the image to open in full size.
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Old 5th August 2007, 09:57 AM   #1818
wlowes is offline wlowes  Canada
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Default Another view of my chip amp

Here is another pic
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File Type: jpg img_0060_1.jpg (43.9 KB, 1498 views)
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Old 5th August 2007, 09:57 AM   #1819
wlowes is offline wlowes  Canada
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Default And one more pic

here is a closeup
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File Type: jpg img_0061_1.jpg (48.0 KB, 1488 views)
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Old 5th August 2007, 08:16 PM   #1820
karma is offline karma  Canada
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nice
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