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Old 29th August 2004, 04:09 PM   #1
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Default FET amplifier

Originally posted this in analogue by mistake, mods feel free to delete if you wish.


This is an amplifier I designed several years ago, its unusual in that it has an error correcting output stage based on Hawksfords topology. The PSU used T-Network capacitors from DNM see:
http://www.dnm.co.uk/capacitors.html#tnetwork
It is not really a project for the beginner, but if you persevere it does sound nice, a friend compared it to his Chord SPM1200 and thought it did not go as loud but that was is only criticism. Have fun!
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Old 29th August 2004, 05:05 PM   #2
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try attaching zip file yet again
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Old 29th August 2004, 06:19 PM   #3
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Default amp picture

picture of inside of the amplifier
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Old 29th August 2004, 06:21 PM   #4
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Default amplifier picture

side picture of amplifier
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Old 29th August 2004, 08:05 PM   #5
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amp schematic in bitmap form. Original files are ISIS/ARES
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Old 29th August 2004, 08:07 PM   #6
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PSU schematic original files are ISIS/ARES readers are available from www.labcenter.co.uk
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Old 29th August 2004, 08:36 PM   #7
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No answers here - you must say, how it sounded in comparision with GC, not with CHORD - I know imagine it, 'cos I'm using error correction too, but mostly of guys here not .
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Old 30th August 2004, 09:12 AM   #8
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IME chip amps sound OK for most purposes, but lack that finesse, bass slam and three dimensional imaging you get with a good discrete design. Basically I have not heard an amplifier costing less than 3000UKP sounding anywhere near as good as this design. Someone has reviewed in another forum, I will ask permission to post it here.

Russ
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Old 30th August 2004, 03:34 PM   #9
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Default Error

Apologies there is an error in the original schematic, if anyone was wondering why the junction of C5 and D1 one did not go anywhere it goes to the junction of R15 R13 and Q9. The PCB is correct. Moral of story do not try and do any work with small children in the vicinity.
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Old 30th August 2004, 03:39 PM   #10
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Russ, I'm last one, who need explanation about sound of this type amp , I say again, I like error correction ( my design is little bit more complicated, but in principle similar ). I'm using too dual monaural conception, but my devices inside are little bit less sloshed - it was joke . But remember, that most of guys here like much more simply design and when are talking about discrete design, they stoped thinking by six transistor quasicomplement .
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