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Old 4th October 2009, 08:11 PM   #1121
fotios is offline fotios  Greece
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Default DSO capture of Charisma 0K6 output DC offset

Click the image to open in full size.

That's enough for today. Tomorrow again
Fotios
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Old 4th October 2009, 09:06 PM   #1122
fotios is offline fotios  Greece
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Default My Whims...

I have a curious sense. It comes probably from my employment with big power loudspeakers and amplifiers for PA use, 27 years ago (from 1983).
The big output power of an amplifier, can covers enough of its - possibly - inherent deficiencies owed to its circuit design or to its implementation with medium quality parts. Of course Charisma 0K6 is implemented with Hi-End quality capacitors and resistors (i don't want to including transistors because there is a big discordance of opinions about them). There is no one part which has inductance (except the enormous output inductor of 0,8μH made from 2mm copper wire) in the signal path.
For the above reason i have an inclination to make amplifiers from 180Wrms/8Ω and above. I place a low limit in my power supplies according to the standard working voltage of capacitors which is 63Vdc. To this, my low limit it is the +/-60Vdc supply rails and the 600VA transformers.
Maybe i am wrong in this curious sense, i don't know.

Fotios
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Old 4th October 2009, 10:40 PM   #1123
Spiny is offline Spiny  United Kingdom
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A Diy Pre - Amplifier and Power, the power is a varient of steve dunlap's Krill amp.

The Pre is an attempt to use all voltage controls - Optical controls and relay selection (driven by a LM3819)

alan
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Old 4th October 2009, 11:12 PM   #1124
Spiny is offline Spiny  United Kingdom
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Quote:
Originally Posted by Spiny View Post
relay selection (driven by a LM3819)

alan
OOPS LM 3914 - run out of edit time
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Old 5th October 2009, 09:36 AM   #1125
Netlist is offline Netlist  Belgium
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Pavel's thread is now here: Pavel Dudek's (Upupa Epops) amplifiers II

/Hugo
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Old 12th October 2009, 04:17 PM   #1126
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Default Dx TriAmp - under construction

Attached,

regards,

Carlos
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Convertion of 8 speaker output wire into standard 2 wires; https://www.youtube.com/watch?v=toZjKw3uUMo; Unbeatable!; https://www.youtube.com/watch?v=u4tGBiqMnzQ
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Old 18th October 2009, 06:55 PM   #1127
400 is offline 400  Germany
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Default B1, INA-phono-pre, F5

Hi,

now some pictures of my preamp including a First Watt B1-clone and a INA-phono-pre.
I use it in combination with my F5-clone.
Really nice sound and only some little problems.
In the moment I have some DC/offset in the first seconds (30-60s) and a very little noise with the phono-pre (platINA).
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File Type: jpg IMG_1760_V2_kl.jpg (155.2 KB, 942 views)
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Old 19th October 2009, 11:40 AM   #1128
Nrik is offline Nrik  Denmark
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400 That looks sooooo nice !
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Old 20th October 2009, 04:06 PM   #1129
sajti is offline sajti  Hungary
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Hi,

I'm working on my new hybrid amplifier. The whole amplifier will be point to point wiring except the protection pcb. The following pictures contains the ss output stage.

Sajti
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Old 22nd October 2009, 06:32 AM   #1130
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Just finished building and biasing my first power amp, wanted to share

It's Silicon Chip Magazine's 20watt Class A design, no mods. The pre/headphones amp in the second pic are also SC designs, but full of opamps and bipolar electrolytics so next project is a tube/discrete pre, and then tube/discrete h-p amp.

I've had this thing together except for power trafo and output inductor for maybe a year now...

Managed to ninja a pair of 24volt 160VA garden lamp transformers from work, wired 'em up to get 24-0-24 and got the thing going! Will replace with a nice toroid when I can afford it.

Those 'sinks are hot though, i'm worried about the MDF boards. Yes i'm going to have enclosures made ;P

Currently christening it with Devin Townsend's 'Infinity', and then Symbion Project's 'Immortal Game' One loud and full of cymbals, and the other sweet and open, I figure a good way to start my ventures into Class A
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File Type: jpg 2.jpg (57.5 KB, 760 views)

Last edited by derwhalfisch; 22nd October 2009 at 06:38 AM.
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