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Old 2nd September 2013, 10:55 PM   #3221
AJT is offline AJT  Philippines
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guys, i was talking better practice here, i never said that that won't work....
having worked as a qc engineer in oil and gas refinery projects,
i was merely sharing how it was done over there...
you can do it any which way you want for all i care...
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the best advertisement for a good audio design is the number of diy'ers wanting to build it after all the years....never the say so of so called gurus....
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Old 3rd September 2013, 04:40 AM   #3222
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Default Bad earthing- again!

Hi AJT and others. I have been guilty in the past of not "doing it right" in the past so far as earthing an amp goes. Check out the rather dodgy "earth lifter" arrangement in an early pre Quasimodo amp I built some time back- for shame!
I have since repented and now do a proper job of it...
But as this post is about showing solid state builds, I thought that I would throw in this rather crazy effort from the past!
Check it out; no circuit boards, no tag strips, no protection zeners on the output stage mosfets, no output inductor, so source resistor on the p-channel mosfet, no screws holding the output devices to the heat-sink, no protection circuitry and, some would say- no brains involved!
The funny thing is that it sounded very good indeed, and just slightly better than an early version of Hugh Dean's NAKSA 70 that I had just built up.
Hugh is a very generous guy and has only just broken the habit of giving me free samples of his latest pcb creations!
The gent who owns that amp now uses it on his Yamaha NS 1,000's, and apparently it does an excellent job of it! And, after several years of use, it still works a treat- who wooda thunk it!
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Old 3rd September 2013, 08:10 PM   #3223
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Default ne5532 pre-stage

Got my 5532's today and assembled and measured my pre-stage.
First image a reference of the sound-card and the second one channel of the pre-stage. There is some 5 times gain in it.
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Old 9th September 2013, 10:07 AM   #3224
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My latest FetZilla amp build for my brother
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Old 9th September 2013, 01:25 PM   #3225
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really nice mister meanman1964

Regards
Juan
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Old 9th September 2013, 01:42 PM   #3226
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Thanks Juan,it's also sounding nice
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Old 9th September 2013, 01:50 PM   #3227
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AX11 + PSU with protect
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Old 9th September 2013, 07:55 PM   #3228
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Measured my amp today, sub 10 ppm at 1V out 8R2 load, okayish...
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Old 14th September 2013, 01:39 PM   #3229
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My power amp.
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Old 15th September 2013, 07:30 PM   #3230
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So, boxes finished, they will be playing music tomorrow
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