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Old 5th December 2008, 05:06 PM   #1
tadiam is offline tadiam  Argentina
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Default dartzeel amp schematic..build this?

how sound...this amp work....
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Old 5th December 2008, 09:50 PM   #2
lineup is offline lineup  Sweden
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nobody can have a schematic, cause is a very secret commercial
this is the way to create mythic, mystic aura around one object:
- tell as little as possible about facts
- tell other more subjective things to 'paint ' your object in minds
- put a very high price
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Old 5th December 2008, 10:10 PM   #3
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Schematics are available on the net, and this amp has even been simulated by some. Have a look at the company s pdfs, there is a conceptual schematic on the NHB 108 model, you could reverse engineer from there the working currents and voltages. Its a simple design with awful measurements but it has won some awards for its sound.

Mystic it sure is. Build it and come tell us how it sounds.
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Old 5th December 2008, 11:05 PM   #5
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If it sounds the way it looks then it cannot be bad
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Old 29th September 2015, 08:03 AM   #6
jlithen is offline jlithen  Finland
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I built one from the cheaper kit on ebay.

PCB was pretty awful, mirrored markings and some markings missing entirely.
Some components were also missing et.c.
Well, I replaced all caps with better ones anyway.

Sound is good. Depth comes close to a good class-A one.
And with my, far too tiny, transformer I get 2x70W @ 7ohm

This proto looks like crap, because I did not find one suitable transformer and had to use 3. Also this case had a preamp built in so I had to power that one too.
I should try bypassing it.

The problem I have is hum on one channel, I have swapped inputs to make sure it is not the input circuit.
I've had no problems with oscillation, but frequency response of this one only extends to 450kHz -3dB (not 1MHz as manufacturer states)

As this kit has a speaker relay it cannot go up in smoke due to a speaker wire coming loose
Maybe I did not get an exact copy of NHB-108, bandwidth would suggest that too
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Old 29th September 2015, 10:48 AM   #7
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Here's the schematic from Taobao, a NHB-108B clone of Chinese.
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File Type: gif Dartzeel TB2PrxOcpXXXXXsXXXXXXXXXXXX-20630408.gif (81.2 KB, 816 views)
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Old 30th September 2015, 09:23 AM   #8
jlithen is offline jlithen  Finland
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Thanks for the schematic!

This is what I bought by the way:
Assembled No Feedback Amplifier Board Base on Dartzeel Amp 2 Board L157 13 | eBay
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Old 5th October 2015, 10:12 AM   #9
jlithen is offline jlithen  Finland
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Found the source of the hum.
Left speaker ground was not connected exactly to the midpoint.
Did a quick fix and now hum is gone, but there is a high pitch 100Hz modulated noise.

My friend pointed out it could be rectifier noise.
I think I will rip out all the Calaf parts from the case and make some high end fast diode rectifiers and use a separate soft start board.
This will save space.

I also removed the input selector and attenuator power supply.
Better keep a power amp as a power amp and not make it an integrated amp at this point.
I'll try to get a separate power supply for each channel too.

I must say the sound is impressive.
I just wish it was softer and warmer.
Detail, depth and power are definitely there.

Input coupling cap is ERO 4uF MKC.
In my experience a 10uF MKL does sound nicer sometimes. (or then it is just my imagination)
Better test this when I have time
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Old 5th October 2015, 11:29 AM   #10
weskoki is offline weskoki  Europe
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Have you compared it to other amps?
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