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Old 7th December 2016, 08:33 AM   #5001
dadod is offline dadod  Croatia
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Quote:
Originally Posted by xrk971 View Post
This is the best sounding head amp I have heard so far.

MOSFET follower headphone amplifier

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So you still have not finished GainWire mk3!
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Old 7th December 2016, 10:08 AM   #5002
prasi is offline prasi  India
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Quote:
Originally Posted by xrk971 View Post
This is the best sounding head amp I have heard so far.
Latest is always the best! The spirit of DIY!
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Old 7th December 2016, 10:38 AM   #5003
xrk971 is offline xrk971  United States
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Originally Posted by dadod View Post
So you still have not finished GainWire mk3!
Hi Dadod,
I really will build your amp. It's just that low hanging fruit of 4 actives vs 40 in the case of GW Mk3 presents a "laziness activation potential" for me. But actually I am missing several key components from the Mk3 BOM still.

So, no, this amp has not been compared to your amp yet. So it may fall still. It has no voltage gain though so for high impedance phones, will require a powerful preamp.

I forgot to mention that this is also my very first home made PDF based laser printer iron on transfer PCB. It was simple enough to try a rather watershed event for me.

Last edited by xrk971; 7th December 2016 at 10:46 AM.
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Old 7th December 2016, 10:42 AM   #5004
xrk971 is offline xrk971  United States
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Originally Posted by prasi View Post
Latest is always the best! The spirit of DIY!
Ha ha. You might be right - but what I can say is that this amp is the most silent of any amp I have heard. The ability for it to extract low level detail is astonishing. It sounds like it is not there to do anything but boost current. No coloration and super neutral. Even with no regulation on PSU, no cap Mx, nothing but CRC, it is dead silent. Measures 0.0mV at amp output with my Fluke 101.

Dadod's GW Mk3 may knock it off its throne - but what a simple 4 actives with 2 x LU1014D throne that is. (J310 CCS for bias not withstanding).

Last edited by xrk971; 7th December 2016 at 10:48 AM.
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Old 7th December 2016, 03:49 PM   #5005
tmyr is offline tmyr  Greece
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Originally Posted by xrk971 View Post
Very nice. What amp is this - type, power, etc?
...it's a +/-65volt rails at about 400w of transformer from a scraped PA amp,
to a pair of sir A.Holton's n-Channel amplifier built on my cnc engraved pcb's with 7225 mosfets. the Caps are 33kuf/70v each, heatsinks are from old pc, fans are temp controled, fuses for protection, custom soft start, latch relay for on of, quite challenging to assemble or someday repair
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Old 13th December 2016, 07:40 PM   #5006
tmyr is offline tmyr  Greece
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Hi again this one i did once i found some smd fets.. it actualy works pretty well on the test bench .. the "n-cnannel amp" with lots of small fets
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Old 13th December 2016, 07:54 PM   #5007
pinnocchio is offline pinnocchio  Canada
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Originally Posted by tmyr View Post
Hi again this one i did once i found some smd fets.. it actualy works pretty well on the test bench .. the "n-cnannel amp" with lots of small fets
Wow! quite an amazing build!!! Really professional with an artistic touch!

What are the specs?

Congrats!
Do
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Old 14th December 2016, 05:18 AM   #5008
dudaindc is offline dudaindc  United States
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Quote:
Originally Posted by tmyr View Post
Hi again this one i did once i found some smd fets.. it actualy works pretty well on the test bench .. the "n-cnannel amp" with lots of small fets
Nice!
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Old 14th December 2016, 10:29 AM   #5009
smartx21 is offline smartx21  Brazil
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tmyr, is that an SSD case?
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Old 14th December 2016, 06:09 PM   #5010
tmyr is offline tmyr  Greece
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tmyr, is that an SSD case?
..its all cnc machined from 6 and 2.5mm thick aluminum, 6mm Plexiglas and double sided fr4 . the specs are as for +/-40v rails class AB amp . those 20 smd fets equal to about 2 irfp250's . it is as big as a SSD though..
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Last edited by tmyr; 14th December 2016 at 06:30 PM.
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